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Linder, C., Vucko, F., Ma, T., Proper, S. & Dartfeldt, E. (2023). Corrosion-Fatigue Performance of 3D-Printed (L-PBF) AlSi10Mg. MATERIALS, 16(17), Article ID 5964.
Open this publication in new window or tab >>Corrosion-Fatigue Performance of 3D-Printed (L-PBF) AlSi10Mg
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2023 (English)In: MATERIALS, Vol. 16, no 17, article id 5964Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
MDPI, 2023
Keywords
atmospheric corrosion; fatigue; additive manufacturing; 3D printing; aluminum alloys; AlSi10Mg
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-70148 (URN)10.3390/ma16175964 (DOI)
Note

This research received no external funding.

Available from: 2024-01-22 Created: 2024-01-22 Last updated: 2024-05-21Bibliographically approved
Mendibide, C., Vucko, F., Martinez, M., Joshi, G. & Kittel, J. (2023). Effect of degraded environmental conditions on the service behavior of a X65 pipeline steel not designed for hydrogen transport. International journal of hydrogen energy
Open this publication in new window or tab >>Effect of degraded environmental conditions on the service behavior of a X65 pipeline steel not designed for hydrogen transport
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2023 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487Article in journal (Refereed) Epub ahead of print
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

Place, publisher, year, edition, pages
Elsevier Ltd, 2023
Keywords
Fracture toughness, Hydrogen induced cracking, Hydrogen permeation, Hydrogen transport, Pipeline, Slow strain rate test, Cracks, Digital storage, Ductile fracture, Fossil fuels, Fracture testing, Hydrogen, Hydrogen embrittlement, Natural gas, Steel pipe, Strain rate, 'Dry' [, Environmental conditions, Green energy, Service behaviors, Slow strain rate tests, Steel grades, X65 pipe-line steel, Pipelines
National Category
Corrosion Engineering
Identifiers
urn:nbn:se:ri:diva-65558 (URN)10.1016/j.ijhydene.2023.05.309 (DOI)2-s2.0-85162176430 (Scopus ID)
Note

Correspondence Address: C. Mendibide; Institut de La Corrosion (French Corrosion Institute), Part of RISE - ZA Du Parc, Fraisses, Secteur Gampille, F-42490, France;   

Available from: 2023-06-30 Created: 2023-06-30 Last updated: 2023-06-30Bibliographically approved
Helbert, V., Nazarov, A., Taryba, M., Vucko, F., Montemor, F. & Thierry, D. (2023). Kinetics of corrosion reactions on press hardened steel in atmospheric conditions under thin electrolyte films. Electrochimica Acta, 458, Article ID 142500.
Open this publication in new window or tab >>Kinetics of corrosion reactions on press hardened steel in atmospheric conditions under thin electrolyte films
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2023 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 458, article id 142500Article in journal (Refereed) Published
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

Place, publisher, year, edition, pages
Elsevier Ltd, 2023
Keywords
Atmospheric corrosion, Electrodes, Electrolytic reduction, Galvanic corrosion, Hardening, Presses (machine tools), Sodium chloride, Sodium hydroxide, Steel corrosion, Atmospheric conditions, Condition, Corrosion process, Corrosion reaction, Environmental assisted crackings, Galvanic coupling, Hardened steel, Kelvin probe, Mechanical performance, Thin electrolyte films, Electrolytes
National Category
Corrosion Engineering
Identifiers
urn:nbn:se:ri:diva-64842 (URN)10.1016/j.electacta.2023.142500 (DOI)2-s2.0-85156229324 (Scopus ID)
Note

Funding details: Fundação para a Ciência e a Tecnologia, FCT, CQE - UIDB/00100/2020, LA/P/0056/2020, UIDP/00100/2020; Funding details: ArcelorMittal; Funding details: Research Fund for Coal and Steel, RFCS, 101034041; Funding text 1: This research work has been implemented within the framework of the European project AtHyCor “Modelling of hydrogen activity from atmospheric corrosion in ultra-high strength steels for light structure application”. This project has received funding from the Research Fund for Coal and Steel under grant agreement No 101034041 . Authors from CQE acknowledge FCT funding under the project CQE - UIDB/00100/2020, UIDP/00100/2020, - LA/P/0056/2020.; Funding text 2: This research work has been implemented within the framework of the European project AtHyCor “Modelling of hydrogen activity from atmospheric corrosion in ultra-high strength steels for light structure application”. This project has received funding from the Research Fund for Coal and Steel under grant agreement No 101034041. Authors from CQE acknowledge FCT funding under the project CQE - UIDB/00100/2020, UIDP/00100/2020, - LA/P/0056/2020.;

Available from: 2023-05-15 Created: 2023-05-15 Last updated: 2024-02-06Bibliographically approved
Vucko, F., Helbert, V. & Nazarov, A. (2023). Quantification of Hydrogen Flux from Atmospheric Corrosion of Steel Using the Scanning Kelvin Probe Technique. Metals, 13(8), 1427-1427
Open this publication in new window or tab >>Quantification of Hydrogen Flux from Atmospheric Corrosion of Steel Using the Scanning Kelvin Probe Technique
2023 (English)In: Metals, Vol. 13, no 8, p. 1427-1427Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
MDPI, 2023
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:ri:diva-67048 (URN)10.3390/met13081427 (DOI)
Note

This project has received funding from the Research Fund for Coal and Steel under grant agreement No 101034041.

Available from: 2023-09-20 Created: 2023-09-20 Last updated: 2024-02-06Bibliographically approved
Ootsuka, S., Vucko, F., Helbert, V., Nazarov, A. & Thierry, D. (2023). Quantification of subsurface hydrogen in corroding mild steel using Scanning Kelvin Probe calibrated by electrochemical permeation technique. Corrosion Science, 221, Article ID 111362.
Open this publication in new window or tab >>Quantification of subsurface hydrogen in corroding mild steel using Scanning Kelvin Probe calibrated by electrochemical permeation technique
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2023 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 221, article id 111362Article in journal (Refereed) Published
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. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2023
Keywords
Atmospheric corrosion, Hydrogen permeation, Quantification, Scanning Kelvin Probe, Steel, Cathodic polarization, Image resolution, Low carbon steel, Probes, Steel corrosion, Electrochemical permeation, Hydrogen fluxes, Kelvin Probe measurements, Permeation technique, Quantification methods, Scanning Kelvin probes, Spatial resolution, Subsurface hydrogens, Mapping
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-65934 (URN)10.1016/j.corsci.2023.111362 (DOI)2-s2.0-85163142077 (Scopus ID)
Note

 Correspondence Address: F. Vucko; French Corrosion Institute, RISE, Brest, France; 

Available from: 2023-08-24 Created: 2023-08-24 Last updated: 2024-02-06Bibliographically approved
Nazarov, A., Helbert, V. & Vucko, F. (2023). Scanning Kelvin Probe for Detection in Steel of Locations Enriched by Hydrogen and Prone to Cracking. Corrosion and Materials Degradation, 4(1), 158-173
Open this publication in new window or tab >>Scanning Kelvin Probe for Detection in Steel of Locations Enriched by Hydrogen and Prone to Cracking
2023 (English)In: Corrosion and Materials Degradation, ISSN 2624-5558, Vol. 4, no 1, p. 158-173Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Multidisciplinary Digital Publishing Institute (MDPI), 2023
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-71398 (URN)10.3390/cmd4010010 (DOI)2-s2.0-85169136798 (Scopus ID)
Note

This project has received funding from the Research Fund for Coal and Steel under grant agreement No. 101034041

Available from: 2024-01-25 Created: 2024-01-25 Last updated: 2024-02-06Bibliographically approved
Vucko, F., Ringot, G., Thierry, D. & Larché, N. (2022). Fatigue Behavior of Super Duplex Stainless Steel Exposed in Natural Seawater Under Cathodic Protection. Frontiers in Materials, 9, Article ID 826189.
Open this publication in new window or tab >>Fatigue Behavior of Super Duplex Stainless Steel Exposed in Natural Seawater Under Cathodic Protection
2022 (English)In: Frontiers in Materials, ISSN 2296-8016, Vol. 9, article id 826189Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2022
Keywords
cathodic protection (CP), fatigue, hydrogen, natural seawater, super duplex stainless steel, Bending tests, Cathodic protection, Durability, Fatigue of materials, Hydrogen embrittlement, Inert gases, Seawater, Steel corrosion, Surface defects, Thermal aging, Cathodic protection systems, Fatigue behaviour, Hydrogen charging, Industrial product, Operating condition, Real environments, Superduplex stainless steels, Test condition, Fatigue testing
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:ri:diva-58778 (URN)10.3389/fmats.2022.826189 (DOI)2-s2.0-85124618547 (Scopus ID)
Note

Funding text 1: The authors declare that this study received funding from ARCOR association in the frame of the Member Research Consortium (MRC) “Marine Corrosion”. The industrial members of this association are: Aker Solutions, Aperam, DGA, EDF, Equinor, FlexiFrance/TechnipFMC, Industeel ArcelorMittal, IxBlue, Neotiss, National Oilwell Varco, Outokumpu, Saipem, Sandvik, Thalès, TotalEnergies, Vallourec, Veolia, voestalpine BOHLER Edelstahl, and Volvo Penta. The design of the study and the decision to publish the paper was discussed and validated with the consortium. The funders were not involved in the collection, analysis, interpretation of data and the writing of this article.; Funding text 2: The authors acknowledge the industrial partners of the Member Research Consortium (MRC) “Marine Corrosion” from the ARCOR association for funding, material supply, and fruitful discussions on

Available from: 2022-03-04 Created: 2022-03-04 Last updated: 2023-05-26Bibliographically approved
Vucko, F., Ootsuka, S., Rioual, S., Diler, E., Nazarov, A. & Thierry, D. (2022). Hydrogen detection in high strength dual phase steel using scanning Kelvin probe technique and XPS analyses. Corrosion Science, 197, Article ID 110072.
Open this publication in new window or tab >>Hydrogen detection in high strength dual phase steel using scanning Kelvin probe technique and XPS analyses
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2022 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 197, article id 110072Article in journal (Refereed) Published
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

Place, publisher, year, edition, pages
Elsevier Ltd, 2022
Keywords
High strength steel, Hydrogen, Scanning Kelvin Probe, XPS, Iron compounds, Oxide films, Probes, Scanning, X ray photoelectron spectroscopy, Dual-phases steels, Film reduction, High-strength, High-strength steels, Hydrogen desorption, Hydrogen detection, Hydrogen permeation, Parallel A, Scanning Kelvin probe techniques, Scanning Kelvin probes
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:ri:diva-58510 (URN)10.1016/j.corsci.2021.110072 (DOI)2-s2.0-85122635828 (Scopus ID)
Available from: 2022-02-17 Created: 2022-02-17 Last updated: 2023-05-16Bibliographically approved
Vucko, F., Prestat, M., Holzer, L., Tribollet, B., Pélissier, K. & Thierry, D. (2021). Anodic degradation of Zn-Ni coatings in moderately alkaline NaCl solution. Materials letters (General ed.), 293, Article ID 129701.
Open this publication in new window or tab >>Anodic degradation of Zn-Ni coatings in moderately alkaline NaCl solution
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2021 (English)In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 293, article id 129701Article in journal (Refereed) Published
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. 

Place, publisher, year, edition, pages
Elsevier B.V., 2021
Keywords
Corrosion, Microstructure, Simonkolleite, Zinc-nickel, Binary alloys, Electrolytes, Nickel coatings, Sodium chloride, Zinc alloys, Zinc coatings, Alkalines, Crack free, Mud cracks, NaCl solution, Overpotential, Steel samples, Zinc dissolution, Zn-Ni coatings
National Category
Chemical Engineering
Identifiers
urn:nbn:se:ri:diva-54682 (URN)10.1016/j.matlet.2021.129701 (DOI)2-s2.0-85103244245 (Scopus ID)
Note

 Funding text 1: Coventya is gratefully acknowledged for the coating deposition. C. Zaubitzer (ScopeM, ETH-Zurich) is thanked for assistance with FIB-SEM experiments.

Available from: 2021-06-28 Created: 2021-06-28 Last updated: 2023-12-04Bibliographically approved
Helbert, V., Nazarov, A., Vucko, F., Rioual, S. & Thierry, D. (2021). Hydrogen effect on the passivation and crevice corrosion initiation of AISI 304L using Scanning Kelvin Probe. Corrosion Science, 182, Article ID 109225.
Open this publication in new window or tab >>Hydrogen effect on the passivation and crevice corrosion initiation of AISI 304L using Scanning Kelvin Probe
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2021 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 182, article id 109225Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Elsevier Ltd, 2021
Keywords
Cathodic polarisation, Crevice corrosion, Passive film, SKP, Stainless steel, XPS, Chlorine compounds, Hydrogen, Iron compounds, Iron metallography, Passivation, Polarization, Probes, Steel corrosion, X ray photoelectron spectroscopy, AISI 304L stainless steel, Corrosion initiation, Corrosion of steel, Hydrogen effect, Hydrogen effusion, Potential drop, Scanning Kelvin probes, Surface films
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:ri:diva-54685 (URN)10.1016/j.corsci.2020.109225 (DOI)2-s2.0-85100437390 (Scopus ID)
Available from: 2021-06-28 Created: 2021-06-28 Last updated: 2024-02-06Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6847-5446

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