Endre søk
Link to record
Permanent link

Direct link
Publikasjoner (10 av 27) Visa alla publikasjoner
Thierry, D., Persson, D. & Le Bozec, N. (2024). Long-term atmospheric corrosion rates of Zn55Al-coated steel. Materials and corrosion - Werkstoffe und Korrosion
Åpne denne publikasjonen i ny fane eller vindu >>Long-term atmospheric corrosion rates of Zn55Al-coated steel
2024 (engelsk)Inngår i: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
Abstract [en]

Hot-dip Zn55Al-coated steel samples have been exposed for up to 6 years at 11 different weathering sites, including marine, marine-industrial, acid-rain and dry atmospheres. From the mass loss measurements, Zn55Al metallic coating showed globally long-term good corrosion resistance in all weathering conditions compared with hot-dip Zn-0.2Al-coated steel (Z). Yet, weaker performance was observed on Zn55Al in high SO2 polluted atmosphere, particularly when combined with seawater aerosols. This is explained by a more acidic surface condition linked to high SO2. Although the extent of corrosion in this phase was different at the different sites, the final corrosion products formed after 6 years were rather similar at all sites. This consists of hydrous aluminium sulphate or hydrous aluminium hydroxy sulphate and, probably also a smaller amount of sulphate-containing zinc corrosion products or Al/Zn products.

sted, utgiver, år, opplag, sider
John Wiley and Sons Inc, 2024
Emneord
atmospheric corrosion, hot-dip zinc-coated steel, zinc aluminium, Acid rain, Aluminum alloys, Aluminum coated steel, Aluminum coatings, Aluminum corrosion, Binary alloys, Corrosion rate, Corrosion resistance, Corrosion resistant coatings, Seawater corrosion, Steel corrosion, Sulfur compounds, Weathering, Zinc alloys, Zinc coatings, Atmospheric corrosion rates, Coated steel, Corrosion products, Dry atmospheres, Hot dips, Hot-dip zincs, Mass-loss measurement, Steel samples, Zinc-coated steel
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-71953 (URN)10.1002/maco.202314209 (DOI)2-s2.0-85181487920 (Scopus ID)
Merknad

ArcelorMittal, voestalpine, SSAB Europe, Ternium, TataSteel and Bluescope steel are acknowledged for thefinancial support.

Tilgjengelig fra: 2024-02-27 Laget: 2024-02-27 Sist oppdatert: 2024-05-27bibliografisk kontrollert
Wärnheim, A., Kotov, N., Dobryden, I., Telaretti Leggieri, R., Edvinsson, C., Heydari, G., . . . Claesson, P. M. (2024). Nanomechanical and nano-FTIR analysis of polyester coil coatings before and after artificial weathering experiments. Progress in organic coatings, 190, Article ID 108355.
Åpne denne publikasjonen i ny fane eller vindu >>Nanomechanical and nano-FTIR analysis of polyester coil coatings before and after artificial weathering experiments
Vise andre…
2024 (engelsk)Inngår i: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 190, artikkel-id 108355Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Local heterogeneities can have significant effects on the performance of anti-corrosion coatings. Even small features can act as initiation points for damage and result in corrosion of the substrate material. Analysis methods with high spatial resolution and the ability to collect information relevant to crosslinking and degradation behavior of these coatings are therefore highly relevant. In this work, we demonstrate the utility of nanomechanical AFM measurements and nano-FTIR in investigating the nanoscale mechanical and chemical properties of two polyester coil coating clearcoats before and after weathering. On the nanoscale, weathering led to a stiffer and less deformable coating with less variation in the nanomechanical properties. Chemical degradation was quantified using changes in band ratios in the IR-spectra. Macro and nano-scale measurements showed similar trends with the latter measurements showing larger heterogeneity. Our results demonstrate the usefulness of the described analysis techniques and will pave the way for future studies of local properties in other coating systems and formulations. © 2024 The Authors

sted, utgiver, år, opplag, sider
Elsevier B.V., 2024
Emneord
Corrosion resistant coatings; Crosslinking; Nanotechnology; Weathering; Artificial weathering; Coil coatings; FTIR; FTIR analysis; Local heterogeneity; Nano scale; Nano-FTIR; Nanomechanical; Nanomechanical property; Fourier transform infrared spectroscopy
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-72754 (URN)10.1016/j.porgcoat.2024.108355 (DOI)2-s2.0-85188822290 (Scopus ID)
Merknad

This work was supported by the Swedish Foundation for Strategic Research (SSF) grant FID18-0034.

Tilgjengelig fra: 2024-05-16 Laget: 2024-05-16 Sist oppdatert: 2024-05-16bibliografisk kontrollert
Zavalis, T., Ström, M., Persson, D., Wendel, E., Ahlström, J., Törne, K., . . . Tidblad, J. (2023). Mechanistic Model with Empirical Pitting Onset Approach for Detailed and Efficient Virtual Analysis of Atmospheric Bimetallic Corrosion. Materials, 16(3), Article ID 923.
Åpne denne publikasjonen i ny fane eller vindu >>Mechanistic Model with Empirical Pitting Onset Approach for Detailed and Efficient Virtual Analysis of Atmospheric Bimetallic Corrosion
Vise andre…
2023 (engelsk)Inngår i: Materials, E-ISSN 1996-1944, Vol. 16, nr 3, artikkel-id 923Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A mechanistic model of atmospheric bimetallic corrosion with a simplified empirical approach to the onset of localized corrosion attacks is presented. The model was built for a typical bimetallic sample containing aluminum alloy 1050 and stainless steel 316L sheets. A strategy was developed that allowed the model to be calibrated against the measured galvanic current, geometrical corrosion attack properties, and corrosion products. The pitting-onset simplification sets all pits to be formed at a position near the nobler metal and treated all pits as being of the same shape and size. The position was based on the location of the highest pitting events and the pit attributes on an average of the deepest pits. For 5 h exposure at controlled RH (85%, 91%, and 97%) and salt load (86 μg NaCl/cm2), the model was shown to be promising: both for analysis of local bimetallic corrosion chemistry, such as pH and corrosion products, and for efficient assessment of pitting damage by computing a single largest pit depth. Parametric studies indicated that the pitting-onset approximation deviated the most at the beginning of exposure and when RH was below 91%. © 2023 by the authors.

sted, utgiver, år, opplag, sider
MDPI, 2023
Emneord
AA 1050, aluminum, bimetallic corrosion, galvanic corrosion, lightweight, modeling, pitting, simulation, stainless steel, Aluminum alloys, Aluminum corrosion, Atmospheric chemistry, Atmospheric corrosion, Damage detection, Sodium chloride, Steel corrosion, Corrosion attack, Corrosion products, Mechanistic models, Pittings
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-64101 (URN)10.3390/ma16030923 (DOI)2-s2.0-85147850777 (Scopus ID)
Merknad

Correspondence Address: Zavalis Tommy, RISE Research Institutes of Sweden, Sweden; email: tommy.zavalis@ri.se; Funding details: VINNOVA, 2018-0288; Funding text 1: This work was funded by LIGHTer, a strategic innovation program within the Swedish innovation agency (VINNOVA) grant number 2018-0288.

Tilgjengelig fra: 2023-02-28 Laget: 2023-02-28 Sist oppdatert: 2024-04-04bibliografisk kontrollert
Persson, D., Thierry, D. & Le Bozec, N. (2023). The Effect of Microstructure on Local Corrosion Product Formation during Initial SO2-Induced Atmospheric Corrosion of ZnAlMg Coating Studied by FTIR-ATR FPA Chemical Imaging. Corrosion and Materials Degradation, 4(3), 503-515
Åpne denne publikasjonen i ny fane eller vindu >>The Effect of Microstructure on Local Corrosion Product Formation during Initial SO2-Induced Atmospheric Corrosion of ZnAlMg Coating Studied by FTIR-ATR FPA Chemical Imaging
2023 (engelsk)Inngår i: Corrosion and Materials Degradation, Vol. 4, nr 3, s. 503-515Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The initial atmospheric corrosion of ZM (ZnAlMg)-coated steel in humid air (85% RH) and humid argon (85% RH) containing 320 ppb SO2 was studied using in situ infrared reflection absorption spectroscopy (IRRAS), FTIR-ATR focal plane array (FPA) imaging and SEM-EDS. The corrosion products formed in humid air containing SO2 are mainly composed of magnesium sulphites and sulphates, with sulphite-containing corrosion products formed initially while the contribution from sulphates increased with exposure time. The results from FTIR-FPA imaging and SEM-EDS showed that the magnesium sulphite and sulphate are formed mainly on eutectic phases with a higher quantity of corrosion products formed on the binary eutectic (Zn-MgZn2 ) phases. This is due to presence of microgalvanic elements with the zinc-rich phases as the main sites for the cathodic oxygen reduction while the anodic reactions take place on the eutectic areas. Sulphate content is the highest on the binary eutectic phases, due to the microgalvanic effects and the production of oxidants by the cathodic reaction, which increases the oxidation of sulphite to sulphate.

HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-71123 (URN)10.3390/cmd4030026 (DOI)
Merknad

This research received no external funding

Tilgjengelig fra: 2024-01-25 Laget: 2024-01-25 Sist oppdatert: 2024-01-25bibliografisk kontrollert
Wärnheim, A., Edvinsson, C., Sundell, P.-E., Heydari, G., Deltin, T. & Persson, D. (2022). Depth-Resolved FTIR-ATR Imaging Studies of Coating Degradation during Accelerated and Natural Weathering─Influence of Biobased Reactive Diluents in Polyester Melamine Coil Coating. ACS Omega, 7(27), 23842
Åpne denne publikasjonen i ny fane eller vindu >>Depth-Resolved FTIR-ATR Imaging Studies of Coating Degradation during Accelerated and Natural Weathering─Influence of Biobased Reactive Diluents in Polyester Melamine Coil Coating
Vise andre…
2022 (engelsk)Inngår i: ACS Omega, E-ISSN 2470-1343, Vol. 7, nr 27, s. 23842-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Improved methods to assess the degradation of coil coatings to approximate lifetime have been an area of academic and industrial interest for decades. This work aims to elucidate the differences in the degradation behavior of two coil coating systems: one standard commercial formulation and one formulation with a significant addition of biorenewable reactive diluents. Depth-resolved degradation behavior of samples exposed to accelerated and natural field weathering is assessed. Focal plane array attenuated total reflection-Fourier transform infrared spectroscopy was used to acquire high-resolution chemical data from a sloping cross section. The results agreed with conventional photoacoustic spectroscopy. Degradation profiles for the two coatings were significantly different, with the biobased samples showing a more durable behavior. This study provides a method for detailed assessment of coating degradation, giving a good estimation of its durability. This is both a way to compare the performance of coating systems and to improve the understanding of the impact of exposure conditions, paving the way for the development of more sustainable coil coatings.

Emneord
FTIR focal plane array imaging, Coating degradation, Accelerated weathering, Field exposure, Biobased, Reactive diluent
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-59757 (URN)10.1021/acsomega.2c02523 (DOI)
Forskningsfinansiär
Swedish Foundation for Strategic Research, FID18-0034
Merknad

This project is financially supported by the Swedish Foundation for Strategic Research (SSF).

Tilgjengelig fra: 2022-07-01 Laget: 2022-07-01 Sist oppdatert: 2023-07-06bibliografisk kontrollert
Persson, D. & Thierry, D. (2021). Spectroscopic imaging of the buried substrate / polymer interface upon exposure to corrosive environments. Vibrational Spectroscopy, 113, Article ID 103217.
Åpne denne publikasjonen i ny fane eller vindu >>Spectroscopic imaging of the buried substrate / polymer interface upon exposure to corrosive environments
2021 (engelsk)Inngår i: Vibrational Spectroscopy, ISSN 0924-2031, E-ISSN 1873-3697, Vol. 113, artikkel-id 103217Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Spectroscopic imaging of water at the substrate / polymer interface was demonstrated by a new experimental set-up based on FTIR-ATR focal plane array (FPA) imaging and simultaneous electrochemical impedance spectroscopy measurements. The local distribution of water at the substrate / polymer interfacial region could be imaged with a lateral resolution in the micrometer range. The kinetics of local water uptake vs exposure time on polymer coated Ge as well as on polymer coated and NaCl pre-contaminated Ge surfaces was obtained. The set-up can also be used to study interfacial processes at polymer coated thin film metallic or metal oxide surfaces.

sted, utgiver, år, opplag, sider
Elsevier B.V., 2021
Emneord
Attenuated total reflectance, Focal plane array detector, FTIR-imaging, Infrared spectroscopy, Micro spectroscopy, Electrochemical impedance spectroscopy, Fourier transform infrared spectroscopy, Germanium, Metals, Polymers, Sodium chloride, Underground corrosion, Corrosive environment, Electrochemical impedance spectroscopy measurements, Experimental set up, Interfacial process, Interfacial region, Local distributions, Metal oxide surfaces, Spectroscopic imaging, Plastic coatings
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-52407 (URN)10.1016/j.vibspec.2021.103217 (DOI)2-s2.0-85100413229 (Scopus ID)
Tilgjengelig fra: 2021-02-18 Laget: 2021-02-18 Sist oppdatert: 2023-05-16bibliografisk kontrollert
Thierry, D., Le Bozec, N. & Persson, D. (2020). Corrosion of hot-dip-galvanised steel and zinc alloy-coated steel in ammonia and ammonium chloride. Materials and corrosion - Werkstoffe und Korrosion, 71(7), 1118-1124
Åpne denne publikasjonen i ny fane eller vindu >>Corrosion of hot-dip-galvanised steel and zinc alloy-coated steel in ammonia and ammonium chloride
2020 (engelsk)Inngår i: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 71, nr 7, s. 1118-1124Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

There are many potential causes of corrosion in animal buildings. Animals exhale large quantities of moisture into the air creating high relative humidity in the building if the moisture is not properly vented. High humidity increases the potential for condensation. In addition, ammonia may be found in large quantities in animal buildings. Ammonia is released from manure and urine. In addition, ammonium chloride is used as a nitrogen source in fertilisers. In this study, the atmospheric corrosion of hot-dip-galvanised steel and zinc alloy-coated steel such as zinc–aluminium and zinc–aluminium–magnesium has been studied in atmospheres containing different levels of ammonia. Investigations have also been conducted at different levels of ammonium chloride. The results are discussed in view of the mechanisms of corrosion of zinc and zinc alloy-coated steel in ammonia and ammonium chloride-containing environments.

sted, utgiver, år, opplag, sider
Wiley-VCH Verlag, 2020
Emneord
ammonia, ammonium chloride, atmospheric corrosion, hot-dip-galvanised steel, zinc, zinc–aluminium–magnesium, Alloy steel, Aluminum coated steel, Aluminum corrosion, Animals, Atmospheric humidity, Chlorine compounds, Fertilizers, Galvanizing, Moisture, Stadiums, Zinc alloys, Alloy coated steel, Animal buildings, Galvanised steel, High humidity, High relative humidities, Hot dips, Nitrogen sources, Steel corrosion
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-43414 (URN)10.1002/maco.201911402 (DOI)2-s2.0-85078046911 (Scopus ID)
Tilgjengelig fra: 2020-01-31 Laget: 2020-01-31 Sist oppdatert: 2023-05-26bibliografisk kontrollert
Thierry, D. & Persson, D. (2020). (Invited) Atmospheric Corrosion of Magnesium Alloys: Influence of Aluminium Content. In: ECS Meeting Abstracts, Volume MA2020-02, C06: Atmospheric and Marine Corrosion 2: . Paper presented at ECS Meeting. The Electrochemical Society, MA2020-02(13)
Åpne denne publikasjonen i ny fane eller vindu >>(Invited) Atmospheric Corrosion of Magnesium Alloys: Influence of Aluminium Content
2020 (engelsk)Inngår i: ECS Meeting Abstracts, Volume MA2020-02, C06: Atmospheric and Marine Corrosion 2, The Electrochemical Society , 2020, Vol. MA2020-02, nr 13Konferansepaper, Oral presentation with published abstract (Fagfellevurdert)
Abstract [en]

Magnesium has gained considerable interest as a structural material for automotive and aerospace applications due to its low density and high specific strength. The use of magnesium alloys in engineering applications is, however, mainly limited by their unsatisfactory surface properties and their poor corrosion resistance. In recent years, significant improvements have been made in achieving a better corrosion resistance particularly by reducing the contents of impurities such as Fe, Cu, and Ni. Intermetallic phases, a result of the casting process, play an important role in the corrosion process. The role of these intermetallic phases has been addressed in a number of papers [1–3]. The role of aluminum in the atmospheric corrosion of magnesium alloys has less addressed in the literature [4]. Esmaily et al have shown recently that the rate of corrosion of magnesium alloys decreased when increasing the Al content. However these experiments were performed on commercial magnesium alloys produced high pressure die casting under constant RH exposure at 90% RH. In our work the corrosion behavior of binary Mg-Al alloys as well as that of commercial magnesium alloys with different aluminum contents have studied both under cyclic corrosion exposure in the laboratory and in field exposures in France and in Vietnam. Analyses of corrosion products have also been conducted. Additional in-situ measurements have been performed in order to better understand the atmospheric corrosion mechanisms of Mg alloys. An important decrease in the maximum pit depth can be observed after different laboratory exposures when increasing the aluminum content in the material. Similar results have been obtained after 9 months exposure in Field. Hence, from these results it is obvious that an increase of the aluminum concentration in Mg-Al alloys decreased the corrosion rate of the alloy. This lead in lower mass loss and less deep corrosion attacks in the magnesium grains. The analyses of corrosion products formed after the cyclic corrosion tests and field exposures revealed the presence of Magnesium carbonate and MgCO3(OH)4,4H20, respectively. In both cases magnesium hydroxide (Mg(OH)2 was also found in the corrosion products. The results will be discussed in relation with the microstructure of the cast materials. 

sted, utgiver, år, opplag, sider
The Electrochemical Society, 2020
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-51999 (URN)10.1149/ma2020-02131319mtgabs (DOI)
Konferanse
ECS Meeting
Tilgjengelig fra: 2021-01-25 Laget: 2021-01-25 Sist oppdatert: 2023-05-16bibliografisk kontrollert
Thierry, D. & Persson, D. (2020). (Invited) FTIR Spectroscopical Imaging of the Substrate / Polymer Interface upon Exposure to Corrosive Environments. In: ECS Meeting Abstracts, Volume MA2020-02, C05: High Resolution Characterization of Corrosion Processes 5: In Honor of Philippe Marcus: . Paper presented at ECS Meeting. The Electrochemical Society, MA2020-02(12)
Åpne denne publikasjonen i ny fane eller vindu >>(Invited) FTIR Spectroscopical Imaging of the Substrate / Polymer Interface upon Exposure to Corrosive Environments
2020 (engelsk)Inngår i: ECS Meeting Abstracts, Volume MA2020-02, C05: High Resolution Characterization of Corrosion Processes 5: In Honor of Philippe Marcus, The Electrochemical Society , 2020, Vol. MA2020-02, nr 12Konferansepaper, Oral presentation with published abstract (Fagfellevurdert)
Abstract [en]

Organic coating is an efficient method to protect metal surfaces from corrosive atmospheres but is dependent on the presence of a stable interface between the substrate and the polymer coating. However, coatings based on polymers have mostly only limited barrier properties for water and oxygen. Transport of water to the interfacial region is for most coatings inevitable upon prolonged exposure in aqueous environments. Ingress of water molecules can destabilize the substrate / polymer interface and lead to delamination of the polymer coating and initiation of corrosion processes. In this work was spectrochemical imaging of the substrate / polymer interfacial region using a FTIR-microscope with a focal plane array (FPA) detector is performed in order to follow the water up-take at the substrate / polymer interfacial region with micrometer sized lateral resolution. Chemical imaging of the interfacial region between substrates, such as Ge and Ge with thin Zn metallic layers, and organic coatings was performed during exposure to 0.1 M NaCl and humid air (95 %RH). The water uptake and water induced alterations in the substrate / polymer interfacial region on the microscale was followed. Simultaneous electrochemical impedance measurements allowed correlation of electrochemical information from the coated metal with the chemical imaging of the interfacial region.

sted, utgiver, år, opplag, sider
The Electrochemical Society, 2020
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-51998 (URN)10.1149/ma2020-02121271mtgabs (DOI)
Konferanse
ECS Meeting
Tilgjengelig fra: 2021-01-25 Laget: 2021-01-25 Sist oppdatert: 2023-05-16bibliografisk kontrollert
Thierry, D., Persson, D., Le Gac, A., LeBozec, N., Peltola, A. & Väisänen, P. (2020). Long-term atmospheric corrosion of Zn–5%Al-coated steel and HDG during outdoor worldwide exposures. Corrosion Engineering, Science and Technology, 55(7), 520-530
Åpne denne publikasjonen i ny fane eller vindu >>Long-term atmospheric corrosion of Zn–5%Al-coated steel and HDG during outdoor worldwide exposures
Vise andre…
2020 (engelsk)Inngår i: Corrosion Engineering, Science and Technology, ISSN 1478-422X, E-ISSN 1743-2782, Vol. 55, nr 7, s. 520-530Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Hot-dipped galvanised (HDG) steel and Zn5Al-coated steel were exposed for 6 years at different atmospheric weathering sites worldwide. The mass loss of the coatings has been measured after 1, 2, 4 and 6 years of exposure. In addition, corrosion products have been determined using scanning electron microscopy, X-ray diffraction and FTIR spectroscopy. It is shown that Zn5Al is better than HDG-steel independently on the exposure duration and location. The mass loss of Zn5Al is also less dependent of the environmental parameters (such as chloride deposition, relative humidity and temperature) than HDG-steel. The ratio of performance after 6 years of exposure varied from 1.3 to 5.1 with the mean value of 3.1. The analyses of the corrosion products indicate the formation of protective Zn/Al - (Formula presented.) layered double hydroxide (LDH) and sulphate-containing corrosion products of Zn and Al after 6 years of exposure. A mechanism explaining the superior properties of Zn5Al is proposed. 

sted, utgiver, år, opplag, sider
Taylor and Francis Ltd., 2020
Emneord
Atmospheric corrosion, FTIR spectroscopy, SEM–EDS, XRD, zinc aluminium alloy coating, zinc coating, Aluminum alloys, Aluminum coated steel, Aluminum coatings, Aluminum corrosion, Atmospheric humidity, Binary alloys, Chlorine compounds, Corrosion protection, Fourier transform infrared spectroscopy, Scanning electron microscopy, Sulfur compounds, Thallium alloys, Weathering steel, Zinc alloys, Al coated steels, Chloride depositions, Corrosion products, Environmental parameter, Exposure durations, Layered double hydroxides, Relative humidity and temperatures, Steel corrosion
HSV kategori
Identifikatorer
urn:nbn:se:ri:diva-44796 (URN)10.1080/1478422X.2020.1750162 (DOI)2-s2.0-85083864343 (Scopus ID)
Tilgjengelig fra: 2020-06-08 Laget: 2020-06-08 Sist oppdatert: 2023-05-16bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0003-2042-1235
v. 2.43.0