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Volume 16
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10.3390/polym16202945
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Article

Corrosion Properties of the Composite Coatings Formed on PEO Pretreated AlMg3 Aluminum Alloy by Dip-Coating in Polyvinylidene Fluoride-Polytetrafluoroethylene Suspension

by
Vladimir S. Egorkin
,
Igor E. Vyaliy
*,
Andrey S. Gnedenkov
,
Ulyana V. Kharchenko
,
Sergey L. Sinebryukhov
and
Sergey V. Gnedenkov
Institute of Chemistry Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia
*
Author to whom correspondence should be addressed.
Polymers 2024, 16(20), 2945; https://doi.org/10.3390/polym16202945
Submission received: 20 September 2024 / Revised: 10 October 2024 / Accepted: 17 October 2024 / Published: 21 October 2024
(This article belongs to the Special Issue Polymers and Their Composites Applied in Extreme Environments)
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Abstract

This paper presents the results of an evaluation of corrosion properties of PEO pretreated AlMg3 aluminum alloy samples with polymer coatings obtained by dip-coating in a suspension of superdispersed polytetrafluoroethylene (SPTFE) in a solution of polyvinylidene fluoride (PVDF) in N-methyl-2-pyrrolidone at different PVDF:SPTFE ratios (1:1, 1:3, 1:5, and 1:10). The electrochemical tests showed that samples with a coating formed at a ratio of PVDF to SPTFE of 1:5 possessed the best corrosion properties. The corrosion current density of these samples was more than five orders of magnitude lower than this parameter for bare aluminum alloy. During the 40-day salt spray test (SST) for samples prepared in a suspension at a PVDF:SPTFE ratio of 1:1–1:5, the formation of any pittings or defects was not detected. The PVDF:SPTFE 1:5 sample demonstrated, as a result of the 40-day SST, an increase in corrosion current density of less than an order of magnitude. The evolution of the protective properties of the studied samples was assessed by a two-year field atmospheric corrosion test on the coast of the Sea of Japan. It was revealed that the samples with the PVDF:SPTFE 1:5 coating had electrochemical parameters that remained consistently high throughout the one year of exposure. After this period, the polymer layer was destroyed, which led to a deterioration in the protective characteristics of the coatings.
Keywords: aluminum; barrier coatings; plasma electrolytic oxidation; polytetrafluoroethylene; salt fog; corrosion tests aluminum; barrier coatings; plasma electrolytic oxidation; polytetrafluoroethylene; salt fog; corrosion tests

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MDPI and ACS Style

Egorkin, V.S.; Vyaliy, I.E.; Gnedenkov, A.S.; Kharchenko, U.V.; Sinebryukhov, S.L.; Gnedenkov, S.V. Corrosion Properties of the Composite Coatings Formed on PEO Pretreated AlMg3 Aluminum Alloy by Dip-Coating in Polyvinylidene Fluoride-Polytetrafluoroethylene Suspension. Polymers 2024, 16, 2945. https://doi.org/10.3390/polym16202945

AMA Style

Egorkin VS, Vyaliy IE, Gnedenkov AS, Kharchenko UV, Sinebryukhov SL, Gnedenkov SV. Corrosion Properties of the Composite Coatings Formed on PEO Pretreated AlMg3 Aluminum Alloy by Dip-Coating in Polyvinylidene Fluoride-Polytetrafluoroethylene Suspension. Polymers. 2024; 16(20):2945. https://doi.org/10.3390/polym16202945

Chicago/Turabian Style

Egorkin, Vladimir S., Igor E. Vyaliy, Andrey S. Gnedenkov, Ulyana V. Kharchenko, Sergey L. Sinebryukhov, and Sergey V. Gnedenkov. 2024. "Corrosion Properties of the Composite Coatings Formed on PEO Pretreated AlMg3 Aluminum Alloy by Dip-Coating in Polyvinylidene Fluoride-Polytetrafluoroethylene Suspension" Polymers 16, no. 20: 2945. https://doi.org/10.3390/polym16202945

APA Style

Egorkin, V. S., Vyaliy, I. E., Gnedenkov, A. S., Kharchenko, U. V., Sinebryukhov, S. L., & Gnedenkov, S. V. (2024). Corrosion Properties of the Composite Coatings Formed on PEO Pretreated AlMg3 Aluminum Alloy by Dip-Coating in Polyvinylidene Fluoride-Polytetrafluoroethylene Suspension. Polymers, 16(20), 2945. https://doi.org/10.3390/polym16202945

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