Aggressiveness of Different Ageing Conditions for Three Thick Marine Epoxy Systems
Three different coated steel systems were aged in natural or artificial seawater, in neutral salt spray (NSS), and using alternate immersion tests in order to evaluate the aggressiveness of the different ageing conditions. Commercial epoxy coatings were applied onto steel (S355NL), hot-galvanized st...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Corrosion and Materials Degradation |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2624-5558/2/4/39 |
| _version_ | 1797505767872397312 |
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| author | Alexis Renaud Victor Pommier Jérémy Garnier Simon Frappart Laure Florimond Marion Koch Anne-Marie Grolleau Céline Puente-Lelièvre Touzain Sebastien |
| author_facet | Alexis Renaud Victor Pommier Jérémy Garnier Simon Frappart Laure Florimond Marion Koch Anne-Marie Grolleau Céline Puente-Lelièvre Touzain Sebastien |
| author_sort | Alexis Renaud |
| collection | DOAJ |
| description | Three different coated steel systems were aged in natural or artificial seawater, in neutral salt spray (NSS), and using alternate immersion tests in order to evaluate the aggressiveness of the different ageing conditions. Commercial epoxy coatings were applied onto steel (S355NL), hot-galvanized steel (HDG), and Zn-Al15 thermal spraying coated steel. The defect-free systems were immersed in artificial seawater at 35 °C for 1085 days and in natural seawater for 1200 days and were characterized by electrochemical impedance spectroscopy (EIS). Panels with artificial defects were immersed for 180 days in artificial seawater and, regarding adhesion, were evaluated according to ISO 16276-2. In parallel, the three coated systems were submitted to cyclic neutral salt spray (NSS) for 1440 h: defect-free panels were regularly evaluated by EIS, while the degree or corrosion was measured onto panels with artificial defect. After NSS, defect-free panels were immersed in artificial seawater at 35 °C for further EIS investigations. Finally, alternate immersion tests were performed for 860 days for the three defect-free coated systems and for 84 days for panels with a defect. The results showed that, for defect-free panels, immersions in natural or artificial seawater and NSS did not allowed us to distinguish the three different systems that show excellent anticorrosion properties. However, during the alternate immersion test, the organic coating system applied onto HDG presented blisters, showing a greater sensitivity to this test than the two other systems. For panels with a defect, NSS allowed to age the coatings more rapidly than monotone conditions, and the coating system applied onto steel presented the highest degree of corrosion. Meanwhile, the coating systems applied onto HDG and the thermal spray metallic coating showed similar behavior. During the alternate immersion test, the three coated systems with a defect showed clearly different behaviors, therefore it was possible to rank the three systems. Finally, it appeared that the alternate immersion test was the most aggressive condition. It was then proposed that a realistic thermal cycling and an artificial defect are needed when performing ageing tests of thick marine organic coating systems in order to properly rank/evaluate the different systems. |
| first_indexed | 2024-03-10T04:22:57Z |
| format | Article |
| id | doaj.art-847fd51d511e496eb54afda386522bbb |
| institution | Directory Open Access Journal |
| issn | 2624-5558 |
| language | English |
| last_indexed | 2024-03-10T04:22:57Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Corrosion and Materials Degradation |
| spelling | doaj.art-847fd51d511e496eb54afda386522bbb2023-11-23T07:45:50ZengMDPI AGCorrosion and Materials Degradation2624-55582021-12-012472174210.3390/cmd2040039Aggressiveness of Different Ageing Conditions for Three Thick Marine Epoxy SystemsAlexis Renaud0Victor Pommier1Jérémy Garnier2Simon Frappart3Laure Florimond4Marion Koch5Anne-Marie Grolleau6Céline Puente-Lelièvre7Touzain Sebastien8LaSIE UMR CNRS 7356, La Rochelle Université, Av. Michel Crépeau, 17042 La Rochelle, FranceLaSIE UMR CNRS 7356, La Rochelle Université, Av. Michel Crépeau, 17042 La Rochelle, FranceLaSIE UMR CNRS 7356, La Rochelle Université, Av. Michel Crépeau, 17042 La Rochelle, FranceNaval Group, Technocampus Océan, 5 rue de l’Halbrane, 44340 Bouguenais, FranceGeneral Electric, 11 rue Arthur III-CS 86325, CEDEX 2, 44263 Nantes, FranceChantiers de l’Atlantique, BD de la Légion d’Honneur, 44600 Saint-Nazaire, FranceNaval Group, Technocampus Océan, 5 rue de l’Halbrane, 44340 Bouguenais, FranceIRT Jules Verne, CHEM Chaffault, Le Chaffault, 44340 Bouguenais, FranceLaSIE UMR CNRS 7356, La Rochelle Université, Av. Michel Crépeau, 17042 La Rochelle, FranceThree different coated steel systems were aged in natural or artificial seawater, in neutral salt spray (NSS), and using alternate immersion tests in order to evaluate the aggressiveness of the different ageing conditions. Commercial epoxy coatings were applied onto steel (S355NL), hot-galvanized steel (HDG), and Zn-Al15 thermal spraying coated steel. The defect-free systems were immersed in artificial seawater at 35 °C for 1085 days and in natural seawater for 1200 days and were characterized by electrochemical impedance spectroscopy (EIS). Panels with artificial defects were immersed for 180 days in artificial seawater and, regarding adhesion, were evaluated according to ISO 16276-2. In parallel, the three coated systems were submitted to cyclic neutral salt spray (NSS) for 1440 h: defect-free panels were regularly evaluated by EIS, while the degree or corrosion was measured onto panels with artificial defect. After NSS, defect-free panels were immersed in artificial seawater at 35 °C for further EIS investigations. Finally, alternate immersion tests were performed for 860 days for the three defect-free coated systems and for 84 days for panels with a defect. The results showed that, for defect-free panels, immersions in natural or artificial seawater and NSS did not allowed us to distinguish the three different systems that show excellent anticorrosion properties. However, during the alternate immersion test, the organic coating system applied onto HDG presented blisters, showing a greater sensitivity to this test than the two other systems. For panels with a defect, NSS allowed to age the coatings more rapidly than monotone conditions, and the coating system applied onto steel presented the highest degree of corrosion. Meanwhile, the coating systems applied onto HDG and the thermal spray metallic coating showed similar behavior. During the alternate immersion test, the three coated systems with a defect showed clearly different behaviors, therefore it was possible to rank the three systems. Finally, it appeared that the alternate immersion test was the most aggressive condition. It was then proposed that a realistic thermal cycling and an artificial defect are needed when performing ageing tests of thick marine organic coating systems in order to properly rank/evaluate the different systems.https://www.mdpi.com/2624-5558/2/4/39epoxy marine coatingsaccelerated ageing teststhermal cyclingEIScorrosion degree |
| spellingShingle | Alexis Renaud Victor Pommier Jérémy Garnier Simon Frappart Laure Florimond Marion Koch Anne-Marie Grolleau Céline Puente-Lelièvre Touzain Sebastien Aggressiveness of Different Ageing Conditions for Three Thick Marine Epoxy Systems Corrosion and Materials Degradation epoxy marine coatings accelerated ageing tests thermal cycling EIS corrosion degree |
| title | Aggressiveness of Different Ageing Conditions for Three Thick Marine Epoxy Systems |
| title_full | Aggressiveness of Different Ageing Conditions for Three Thick Marine Epoxy Systems |
| title_fullStr | Aggressiveness of Different Ageing Conditions for Three Thick Marine Epoxy Systems |
| title_full_unstemmed | Aggressiveness of Different Ageing Conditions for Three Thick Marine Epoxy Systems |
| title_short | Aggressiveness of Different Ageing Conditions for Three Thick Marine Epoxy Systems |
| title_sort | aggressiveness of different ageing conditions for three thick marine epoxy systems |
| topic | epoxy marine coatings accelerated ageing tests thermal cycling EIS corrosion degree |
| url | https://www.mdpi.com/2624-5558/2/4/39 |
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