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  • 1.
    Fuertes Casals, Nuria
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Nazarov, Andrej
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Vucko, Flavien
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Pettersson, Rachel
    Jernkontoret, Sweden.
    Thierry, Dominique
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Influence of mechanical stress on the potential distribution on a 301 LN stainless steel surface2015In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 162, no 9, p. C465-C472Article in journal (Refereed)
    Abstract [en]

    The aim of the present work was to study the influence of the stress on the electrode potential of the austenitic stainless steel 301LN using Scanning Kelvin Probe (SKP). It was found that elastic deformation reversibly ennobles the potential whereas plastic deformation decreases the potential in both tensile and compressive deformation mode and this decrease is retained even 24 h after removal of the load. To interpret the stress effects, different surface preparations were used and the composition and thickness of the passive film were determined by GDOES. Slip steps formed due to plastic deformation were observed using AFM. The effect of plastic strain on the potential is explained by the formation of dislocations, which creates more a defective passive film.

  • 2.
    Helbert, Varvara
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Nazarov, A
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Vucko, Flavien
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Rioual, S.
    Univ Brest, France.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Hydrogen effect on the passivation and crevice corrosion initiation of AISI 304L using Scanning Kelvin Probe2021In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 182, article id 109225Article in journal (Refereed)
    Abstract [en]

    Scanning Kelvin Probe was applied to study passivation of AISI 304L stainless steel after cathodic polarisation. The rate of passivation in air decreased as a function of duration and current density. X-ray Photoelectron Spectroscopy showed enrichment of the surface film by hydroxides of Fe (II) that was the result of hydrogen effusion from the bulk. SKP measured a decreased potential drop in the passive film. Pre-polarisation accelerates the crevice corrosion of steel in presence of chlorides. Using SKP mapping, increased hydrogen sub-surface concentration and lower level of passivity was observed in anodic zones of the crevice.

  • 3.
    Helbert, Varvara
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Nazarov, Andrei
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Taryba, Maryna
    Universidade de Lisboa, Portugal.
    Vucko, Flavien
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Montemor, Fatima
    Universidade de Lisboa, Portugal.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Kinetics of corrosion reactions on press hardened steel in atmospheric conditions under thin electrolyte films2023In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 458, article id 142500Article in journal (Refereed)
    Abstract [en]

    Steels with high mechanical performance are prone to hydrogen embrittlement and environmental assisted cracking. Under atmospheric corrosion conditions, the source of hydrogen can be the steel corrosion process itself or galvanic coupling with a metallic coating. Electrochemical behaviour of Press Hardened Steel (PHS) under electrolyte films of different thicknesses using local electrochemical techniques was studied on a fundamental level. Scanning Vibrated Electrode Technique (SVET) was applied to study the evolution and localization of the corrosion process during PHS immersion in NaCl electrolyte. Kelvin Probe (KP) was used as a reference electrode to obtain cathodic and anodic polarization curves on PHS surfaces which were covered by thin electrolyte films (60 to 500 µm) of 0.1 M NaOH and 0.6 M NaCl. For both electrolytes, a strong increase in the oxygen reduction rate due to the decreasing of electrolyte thickness has been clearly demonstrated. Data are correlated well with a theoretical plot determined by Nernst-Fick equation. The influence of the rust layers on the kinetics of corrosion reactions under thin electrolyte films was investigated using KP. © 2023

  • 4.
    Kim, Hye-Jin
    et al.
    Hyundai-Steel Company, Republic of Korea; Seoul National University, Republic of Korea.
    Lee, Myoung
    Seoul National University, Republic of Korea.
    Yoon, Seung
    Hyundai-Steel Company, Republic of Korea.
    Vucko, Flavien
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Lee, Chang
    Hyundai Motor Company, Republic of Korea.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Kim, Sung-Ju
    Hyundai-Steel Company, Republic of Korea.
    Diffusible hydrogen behavior and delayed fracture of cold rolled martensitic steel in consideration of automotive manufacturing process and vehicle service environment2020In: Journal of Materials Research and Technology, ISSN 2238-7854, Vol. 9, no 6, p. 13483-13501Article in journal (Refereed)
    Abstract [en]

    This study aims to elucidate the behavior of diffusible hydrogen and delayed fracture in martensitic steel with 1500 MPa strength during automotive painting process and under vehicle service conditions. A sequential process of automotive pretreatment line and vehicle service environment is simulated to evaluate the hydrogen pick up in each process. In case of the automotive painting line, the absorption of hydrogen is within the common range in the process of phosphating treatment and electrodeposition. The baking process plays an effective role for desorbing the diffusible hydrogen absorbed during the automotive pre-treatment such as zinc-phosphating, and electrodeposition process. In case of the corrosion environment under the automotive driving conditions, hydrogen induced delayed fracture is accelerated as the exposure time increases. Further, it is clarified that severe plastic deformation are the significant factors for hydrogen induced delayed fracture under with low pH value and present of chloride ion in a chemical solution parameter. In summary, hydrogen is transported constantly during electrodeposition sequential line process of automobile manufacturing below the hydrogen content of 0.5 ppm, which is not critical value for leading to hydrogen delayed fracture based on results of slow strain rate tensile tests. However, exposure to extreme conditions under service environment of vehicle, such as acidic solution and chloride chemistry solution that result in high level of hydrogen absorption, severe plastic deformation in the sheared edge, and constantly applied internal or external stresses, can cause the hydrogen induced delayed fracture in the fully martensitic steels. © 2020 The Authors

  • 5.
    Linder, Clara
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Vucko, Flavien
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Ma, Taoran
    Proper, Sebastian
    RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.
    Dartfeldt, Erik
    RISE Research Institutes of Sweden, Materials and Production, Applied Mechanics.
    Corrosion-Fatigue Performance of 3D-Printed (L-PBF) AlSi10Mg2023In: MATERIALS, Vol. 16, no 17, article id 5964Article in journal (Refereed)
    Abstract [en]

    Additive manufacturing (AM) allows for optimized part design, reducing weight compared to conventional manufacturing. However, the microstructure, surface state, distribution, and size of internal defects (e.g., porosities) are very closely related to the AM fabrication process and post-treatment operations. All these parameters can have a strong impact on the corrosion and fatigue performance of the final component. Thus, the fatigue-corrosion behavior of the 3D-printed (L-PBF) AlSi10Mg aluminum alloy has been investigated. The influence of load sequence (sequential vs. combined) was explored using Wohler diagrams. Surface roughness and defects in AM materials were examined, and surface treatment was applied to improve surface quality. The machined specimens showed the highest fatigue properties regardless of load sequence by improving both the roughness and removing the contour layer containing the highest density of defect. The impact of corrosion was more pronounced for as-printed specimens as slightly deeper pits were formed, which lowered the fatigue-corrosion life. As discussed, the corrosion, fatigue and fatigue-corrosion mechanisms were strongly related to the local microstructure and existing defects in the AM sample.

  • 6.
    Mendibide, Christophe
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Vucko, Flavien
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Martinez, M
    IFP Energies Nouvelles, France.
    Joshi, GR
    IFP Energies Nouvelles, France.
    Kittel, J
    IFP Energies Nouvelles, France.
    Effect of degraded environmental conditions on the service behavior of a X65 pipeline steel not designed for hydrogen transport2023In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487Article in journal (Refereed)
    Abstract [en]

    With the international drive to deploy green energies and decarbonized intermediates in the place of fossil fuel sources, a large number of developed countries are actively preparing for a future where hydrogen plays a strategic role as an energy storage medium. Producing and using hydrogen requires the rapid expansion of a dedicated, economically viable industrial sector. Nevertheless, questions on how to safely store, transport and distribute hydrogen remain an important priority today. In countries with existing natural gas transport grids, the possibility to retrofit these networks to store and transport hydrogen-natural gas blends is being studied. A key challenge is to evaluate how pressurized H2 would interact with steel structures with regards structural embrittlement of the latter, with a view to exploiting existing transport infrastructures for storage and transport applications. In this work, we evaluate the H2-performance of a non-hydrogen service ×65 pipeline steel. The cracking susceptibility of this steel grade has been evaluated at 100 bar H2 using slow strain rate testing, Constant strain testing and fracture toughness measurements. Accompanying hydrogen permeation tests under pressure provide diffusion data and elucidate the discussion. Exposures were carried out in dry or wet H2 and with or without H2S contamination at levels representative of biogas. The results underline that the impact of dry or wet hydrogen on this grade are moderate. The presence of traces of H2S together with humidity could risk seriously degrading the mechanical performance of the ×65 steel grade. © 2023 The Authors

  • 7.
    Nazarov, Andrei
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Helbert, Varvara
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Vucko, Flavien
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Scanning Kelvin Probe for Detection in Steel of Locations Enriched by Hydrogen and Prone to Cracking2023In: Corrosion and Materials Degradation, ISSN 2624-5558, Vol. 4, no 1, p. 158-173Article in journal (Refereed)
    Abstract [en]

    Hydrogen, due to corrosion processes, can degrade high strength steels (HSS) through embrittlement and stress corrosion cracking mechanisms. Scanning Kelvin probe (SKP) mapping of surface potential was applied, to visualize the locations with an increased subsurface concentration of hydrogen in mild steel and martensitic HSS. This work can help to determine the reasons behind hydrogen localization in a steel microstructure, leading to embrittlement and hydrogen-assisted cracking. Cathodic charging was used to insert hydrogen, which decreased the steel potential. Hydrogen effusion in air passivates steel, increasing the potential of HSS and mild steel. The passivation of steels was monitored depending on different conditions of cathodic pre-charging and the amount of absorbed hydrogen. The SKP could determine the area of diffusible hydrogen and the area of cracks. In addition, low potential locations linked to the hydrogen trapped in the deformed HSS microstructure were also determined, which delayed the steel passivation. Mild steel showed a uniform potential distribution related to interstitial hydrogen, without potential extremes attributed to locally accumulated hydrogen. Thus, SKP sensing can detect locations containing increased concentrations of hydrogen and sensitive to steel cracking.

  • 8.
    Nazarov, Andrei
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Vucko, Flavien
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Scanning Kelvin Probe Investigation of High-Strength Steel Surface after Impact of Hydrogen and Tensile Strain2020In: Corrosion and Materials Degradation, E-ISSN 2624-5558, Vol. 1, no 1, p. 187-197Article in journal (Refereed)
    Abstract [en]

    Hydrogen in combination with mechanical stress can lead to rapid degradation of high-strength steels through environmentally assisted cracking mechanisms. The scanning Kelvin probe (SKP) was applied to automotive martensitic steel grade MS1500 in order to detect local reactivity of the surface after hydrogen uptake and tensile deformation. Hydrogen and stress distribution in microstructures can be characterized by SKP indirectly measuring the potential drop in the surface oxide. Thus, the links between electron work function, oxide condition, and subsurface accumulation of hydrogen and stress have to be investigated. It was shown that plastic strain can mechanically break down the oxide film creating active (low potential) locations. Hydrogen effusion from the steel bulk, after cathodic charging in aqueous electrolyte, reduced the surface oxide and also decreased potential. It was shown that surface re-oxidation was delayed as a function of the current density and duration of cathodic hydrogen pre-charging. Thus, potential evolution during exposure in air can characterize the relative amount of subsurface hydrogen. SKP mapping of martensitic microstructure with locally developed residual stress and accumulated hydrogen displayed the lowest potential.

  • 9.
    Nazarov, Andrej
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Vivier, V.
    Sorbonne Universités, France.
    Thierry, Dominique
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Vucko, Flavien
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Tribollet, B.
    Sorbonne Universités, France.
    Effect of mechanical stress on the properties of steel surfaces: Scanning Kelvin probe and local electrochemical impedance study2017In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 164, no 2, p. C66-C74Article in journal (Refereed)
    Abstract [en]

    The influence of mechanical stress on the electrochemical properties of ferritic steel SAE 1008 and austenitic stainless steel 301LN was studied using Scanning Kelvin Probe and Localized Electrochemical Impedance Spectroscopy (LEIS) techniques. The probe-working electrode Volta potential difference was mapped in situ under load. It was found that the influence of elastic deformation on the potential was small. Plastic deformation decreased the potential of steel by 150–300 mV, whereas the relaxation of the load from the plastic domain increased the Volta potential. However, some locations, which can contain residual stress, remained at low potential. The pre-strained surfaces were characterized by X-ray Photo Electronic Spectroscopy and by Atomic Force Microscopy. Distribution of the capacitance across strained and strain-free surfaces was studied by LEIS in boric/borate electrolyte. The plastic stress increases the capacitance and decreases the ability of the steels to passivate the surface indicating that emerging of pile-ups of dislocations create defective oxide films. © The Author(s) 2017.

  • 10.
    Nazarov, Andrej
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Vucko, Flavien
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Thierry, Dominique
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Hydrogen entry and distribution in steel: Assessments by different local electrochemical techniques2018In: High-Strength Steels: New Trends in Production and Applications, Nova Science Publishers, Inc. , 2018, p. 35-59Chapter in book (Other academic)
    Abstract [en]

    The sensitivity of high strength steels (HSS) to hydrogen embrittlement is well established. Cracking is likely to occur even at very low hydrogen content. Hence, it is important to develop new and very sensitive methods (e.g., with high lateral resolution) to study the sources of hydrogen, the distribution of hydrogen in the metal and the mechanisms of hydrogen interaction with microstructural defects and with the surface oxide. This report reviews the application of the localized electrochemical techniques such as Scanning Kelvin Probe (SKP), Scanning Vibration Electrode Technique (SVET), Local Electrochemical Impedance Spectroscopy (LEIS), and Scanning Electrochemical Microscopies (SECM) to study the hydrogenation of austenitic stainless steel, HSS and galvanized HSS under different experimental conditions. For example, SKP can detect 0.01 ppm of atomic hydrogen. This low detection limit is based on the nanoscale interaction of emerged hydrogen with the surface oxide film. Hydrogen diffuses and decreases the Volta potential of the surface at the locations of the emerging due to the reduction of Fe3+ species in the oxide film. It enables real time monitoring of the reduction of oxide film that is related to the failure of the steel passivity. SKP measurements are carried out in air and provide information on the relative hydrogenation due to atmospheric corrosion. In the case of LEIS, hydrogen interacts with surface oxide increasing the capacitance and decreasing the resistance of the film that can be monitored in a water electrolyte. SECM is able to map hydrogen distribution in the electrolyte in the vicinity of the steel surface. Advantages and disadvantages of the different techniques are discussed. The combined effect of mechanical stress and the hydrogen on the steel passivity is also under the scope of this review.

  • 11.
    Ootsuka, Shinji
    et al.
    JFE Steel Corporation, Japan.
    Vucko, Flavien
    Helbert, Varvara
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Nazarov, Andrei
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Quantification of subsurface hydrogen in corroding mild steel using Scanning Kelvin Probe calibrated by electrochemical permeation technique2023In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 221, article id 111362Article in journal (Refereed)
    Abstract [en]

    Scanning Kelvin probe (SKP) can be applied for mapping of subsurface hydrogen in steels. The good spatial resolution is combined with poor quantification. Controversy, the electrochemical permeation technique (EPT) is extremely sensitive to hydrogen flux but has low spatial resolution. Thus, a local hydrogen quantification method using SKP measurements calibrated by EPT was developed. The fixed amount of hydrogen flux in mild steel membrane was obtained by cathodic polarization and was detected using the two methods. A semi-logarithmic relationship between SKP potential drop and the hydrogen sub-surface concentration underneath of the corroding surface was established. SKP quantification was applied for mapping the subsurface hydrogen in steel corroding under various atmospheric corrosion conditions. 

  • 12.
    Prestat, Michel
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Vucko, Flavien
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Holzer, L.
    Zurich University of Applied Sciences, Switzerland.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Microstructural aspects of Ti6Al4V degradation in H2O2-containing phosphate buffered saline2021In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 190, article id 109640Article in journal (Refereed)
    Abstract [en]

    Ti6Al4V surfaces were exposed to simulated inflammation conditions in H2O2-containing phosphate buffered saline with and without FeCl3. Scanning electron microscopy analysis revealed significantly different degradation modes for the α and β phases. While the α grains are covered by a ca. 400 nm thick protective nanostructured oxide layer, the attack of the β phase generates a porous microstructure with microscaled cracks and a low polarization resistance. The β phase is postulated to be sensitive to H2O2 reduction products and less able to generate a passive oxide film. The presence of FeCl3 enhances the cathodic activity and the β phase degradation.

  • 13.
    Thierry, Dominique
    et al.
    RISE, Swerea, KIMAB.
    Vucko, Flavien
    RISE, Swerea, KIMAB.
    Luckeneder, G.
    voestalpine Stahl GmbH, Austria.
    Weber, B.
    Arcelor Mittal Maizieres Research SA, France.
    Dosdat, L.
    Arcelor Mittal Maizieres Research SA, France.
    Bschorr, T.
    GSI GmbH, Germany.
    Rother, K.
    Munich University of Applied Sciences, German.
    Fatigue behavior of spot-welded joints in air and under corrosive environments: Part II: Fatigue under alternating and combined corrosion and fatigue load2016In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 60, no 6, p. 1231-1245Article in journal (Refereed)
    Abstract [en]

    The main aim of the project was to evaluate the influence of combined effects of fatigue loading and exposure to cyclic corrosion testing on the corrosion and the fatigue resistances of coated steel-based materials joined by resistance spot welding. Seven steel-based materials including cold rolled mild steels, high-strength steels, and press-hardened steels (PHS) were selected and provided by steel suppliers with different surface coatings for resistance spot welding. Panels were joined using conventional resistance spot welding in both lap-shear and T-peel designs. Joined samples were painted by e-coating following the industrial process. Metallographic characterization of the steel materials revealed that microstructures and metallic coating composition and thickness were as expected. Cross section of spot welds showed good quality and typical evolutions of hardness. Tensile tests and fatigue tests were performed on reference samples (fatigue in “air,” i.e., nonexposed to corrosion) leading to typical SN-lines as described in part I of this paper. The results were used to evaluate the influence of corrosion on tensile strength of the joined samples. Fatigue tests performed on combined and alternating corrosion and fatigue revealed that fatigue life is affected by extent of corrosion near the spot weld, with a reduction of the fatigue life at higher applied load and slight increase for lower load, compared to tests “in air.” This phenomenon was not observed for lap-shear configuration in alternated fatigue-corrosion mode. 

  • 14.
    Thierry, Dominique
    et al.
    RISE, Swerea, KIMAB.
    Vucko, Flavien
    RISE, Swerea, KIMAB.
    Luckeneder, Gerald
    Voestalpine Stahl GmbH, Austria.
    Weber, Bastien
    Arcelor Mittal Maizieres Research SA, France.
    Dosdat, Laurence
    Arcelor Mittal Maizieres Research SA, France.
    Bschorr, Thomas
    GSI GmbH, Germany.
    Rother, Klemens
    Munich University of Applied Sciences, Germany.
    Fatigue behavior of spot-welded joints in air and under corrosive environments: Part I: Materials, specimen and test results in air2016In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 60, no 6, p. 1211-1229Article in journal (Refereed)
    Abstract [en]

    The main aim of the project was to evaluate the influence of combined effects of fatigue loading and exposure to cyclic corrosion testing on the corrosion and the fatigue resistances of coated thin sheet steel joined by spot welding. Seven types of steel including cold rolled mild steels, high-strength steels, and press-hardened steels (PHS) were selected and provided by steel suppliers for fatigue strength evaluation of resistance spot welding (RSW) assemblies. Panels were joined using conventional resistance spot welding in both lap-shear and T-peel designs. Joined samples were painted by e-coating following the industrial process. Metallographic characterization of the steels revealed that microstructures and metallic coating composition and thickness were as expected. Cross-section of spot welds showed good quality and typical evolutions of hardness. Tensile tests performed on reference samples (non-exposed to corrosion) showed tensile which were obviously configuration and material dependent. For each configuration, three replicates were tested and did not show significant scatter. The results were and will be used to evaluate the influence of corrosion on tensile strength of the joined samples. Fatigue tests were performed “in air”, meaning without corrosion exposition, leading to typical SN-lines. The results will be used to evaluate the influence of corrosion on the fatigue resistance of the joined samples. 

  • 15.
    Vucko, Flavien
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Helbert, Varvara
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Nazarov, Andrei
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Quantification of Hydrogen Flux from Atmospheric Corrosion of Steel Using the Scanning Kelvin Probe Technique2023In: Metals, Vol. 13, no 8, p. 1427-1427Article in journal (Refereed)
    Abstract [en]

    The atmospheric corrosion of high-strength steels can lead to hydrogen absorption directly linked to hydrogen embrittlement or delayed fracture phenomena. A scanning Kelvin probe (SKP) and electrochemical permeation technique (EPT) were applied to correlate the potential of an oxidized surface with the flux of hydrogen across a thin steel membrane. The side of the membrane opposite the corroding or electrochemically charged area was analyzed. The potential drop in the oxide was calibrated in terms of surface hydrogen activity, and SKP can be applied in situ for the mapping of hydrogen distribution in the corroding metal. A very low flux of hydrogen can be characterized and quantified by SKP, which is typically observed under atmospheric corrosion conditions. Therefore, hydrogen localization that drives steel durability under atmospheric corrosion conditions can be evaluated.

  • 16.
    Vucko, Flavien
    et al.
    RISE, Swerea, KIMAB.
    LeBozec, Nathalie
    RISE, Swerea, KIMAB.
    Thierry, Dominique
    RISE, Swerea, KIMAB.
    Weber, B.
    ArcelorMittal Maizieres Research SA, France.
    Dosdat, L.
    ArcelorMittal Maizieres Research SA, France.
    Luckeneder, G.
    Voestalpine Stahl GmbH, Austria.
    Bschorr, T.
    Gesellschaft für Schweisstechnik International mbH, Germany.
    Rother, K.
    Munich University of Applied Sciences, Germany.
    Sciaboni, C.
    Centro Sviluppo Materiali SpA, Italy.
    Sczepanski, J.
    Bayerische Motoren Werke AG, Germany.
    Combined corrosion and fatigue performance of joined materials for automotive applications2016In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 67, no 11, p. 1143-1151Article in journal (Refereed)
    Abstract [en]

    The aim of this study is to evaluate fatigue performance of joined assemblies (spot weld and/or adhesive bonding) in corrosive environment. Various assemblies have been tested in alternated and simultaneous fatigue-corrosion modes. Adhesive joints are strongly affected by simultaneous fatigue-corrosion with a large drop of the fatigue life compared to results in air. By alternating fatigue and corrosion, the reduction of fatigue life is important. For spot welding, fatigue life is decreased at higher load amplitudes and increased at lower amplitudes. These results are strongly linked to the opening of the gap near the spot weld at high load amplitudes. At low amplitudes, corrosion might limit the local stress at the notch root of the weld. 

  • 17.
    Vucko, Flavien
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Ootsuka, Shinji
    JFE Steel Corporation, Japan.
    Rioual, Stephane
    Univ Brest, France.
    Diler, Erwan
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Nazarov, Andrej
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Hydrogen detection in high strength dual phase steel using scanning Kelvin probe technique and XPS analyses2022In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 197, article id 110072Article in journal (Refereed)
    Abstract [en]

    Hydrogen permeation through high strength DP1180 steel was studied by Scanning Kelvin Probe (SKP) and X-ray photoelectron spectroscopy (XPS). The XPS analyses showed that hydrogen desorption from the steel increased the ratio Fe(II)/Fe(III) related to oxide film reduction. In parallel, a drop of the electrochemical potential in the oxide film was measured by SKP. Analyses of the composition and potential of the surface were correlated based on Nernst red-ox thermodynamic equilibrium. From this approach, it was shown that the SKP potential can be a measure of hydrogen affecting the surface oxide, but additional contributions should be considered. © 2022 The Authors

  • 18.
    Vucko, Flavien
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Prestat, Michel
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Holzer, L.
    Zurich University of Applied Sciences, Switzerland.
    Tribollet, B.
    Sorbonne Université, France.
    Pélissier, Krystel
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Anodic degradation of Zn-Ni coatings in moderately alkaline NaCl solution2021In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 293, article id 129701Article in journal (Refereed)
    Abstract [en]

    Carbon steel samples covered with initially crack-free zinc-nickel coatings were polarized with a small anodic overpotential in moderately alkaline NaCl solution. Along with zinc dissolution, the coatings developed a mud-crack pattern due to tensile stress release, allowing the electrolyte to access the underlying steel surface. Simonkolleite grew on both the zinc-nickel coating and the steel substrate. The resulting current density, that was first strongly anodic, switched to small cathodic values when the coating surface was almost fully covered by a compact simonkolleite layer. 

  • 19.
    Vucko, Flavien
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Ringot, Geoffrey
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Thierry, Dominique
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Larché, Nicolas
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Fatigue Behavior of Super Duplex Stainless Steel Exposed in Natural Seawater Under Cathodic Protection2022In: Frontiers in Materials, ISSN 2296-8016, Vol. 9, article id 826189Article in journal (Refereed)
    Abstract [en]

    Under operating conditions, alternated loading and fatigue are encountered, controlling the durability and safety of components and structures made of super duplex stainless steel (SDSS). In particular, the use of a cathodic protection (CP) system to protect the structure against corrosion can induce hydrogen charging of the SDSS. Thus, the aim of this study was to investigate the sensitivity of some industrial products made of SDSS 2507 (UNS S32750), without artificial thermal aging, under test conditions as close as possible to real environments. In situ fatigue tests under alternated 4-point bending conditions were conducted in natural seawater with and without CP. The fatigue behavior was evaluated as a function of environmental parameters, such as temperature, and material parameters, particularly the austenite spacing and microstructure around orbital welds by Tungsten Inert Gas (TIG) welding and stress concentrations, through the presence of surface defects. The fatigue life obtained in air or in seawater at the open circuit potential (OCP) was rather similar. Fatigue life enhancement was systematically observed under CP particularly in the range of low applied load, despite evidence of brittle failure on the fracture surfaces of samples tested under CP. The data suggest immunity of the SDSS to hydrogen embrittlement under the present experimental conditions of fatigue testing. Copyright © 2022 Vucko, Ringot, Thierry and Larché.

  • 20.
    Vucko, Flavien
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Thierry, Dominique
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, KIMAB.
    Weber, Bastien
    ArcelorMittal, France.
    Luckeneder, Gerald
    Voestalpine Stahl GmbH, Austria.
    Bschorr, Thomas
    Gesellschaft für Schweisstechnik International GmbH, Germany.
    Rother, Klemens
    University of Applied Science, Germany.
    Sciaboni, Crstiano
    Centro Sviluppo Materiali SpA, Italy.
    Sczepanski, Julian
    Bayerische Motoren Werke AG, Germany.
    Simultaneous & alternated fatigue-corrosion performance of joined materials for automotive applications2015In: European Corrosion Congress, EUROCORR 2015, Austrian Society for Metallurgy and Materials (ASMET) , 2015Conference paper (Refereed)
1 - 20 of 20
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