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Open AccessArticle

Influence of Micro-Arc Oxidation Coatings on Stress Corrosion of AlMg6 Alloy

1
Faculty of Marine Engineering, Gdynia Maritime University, 81-225 Gdynia, Poland
2
Joint Institute of Mechanical Engineering of the National Academy of Sciences of Belarus, The State Scientific Institution, 220072 Minsk, Belarus
*
Author to whom correspondence should be addressed.
Materials 2020, 13(2), 356; https://doi.org/10.3390/ma13020356
Received: 16 December 2019 / Revised: 8 January 2020 / Accepted: 10 January 2020 / Published: 12 January 2020
(This article belongs to the Special Issue Advanced Coatings for Corrosion Protection)
This paper shows results of a study on the corrosion behavior of micro-arc oxidation (MAO) coatings sampled from the AlMg6 alloy. The alloy was simultaneously subjected to a corrosive environment and static tensile stress. For comparative purposes, the tests were run for both coated samples and samples without coatings. The research was conducted at a properly prepared stand; the samples were placed in a glass container filled with 3.5% NaCl aqueous solution and stretched. Two levels of tensile stress were accepted for the samples: σ1 = 0.8R0.2 σ2 = R0.2, and the tests were run for two time intervals: t1 = 480 h and t2 = 1000 h. Prolonged stress corrosion tests (lasting up to 1000 h) showed that the samples covered with ceramic coatings demonstrated significantly higher corrosion resistance than the samples without the coatings. Protective properties of the coating could be explained by its structure. Surface pores were insignificant, and their depth was very limited. The porosity level of the main coating layer was 1%. Such a structure of coating and its phase composition provided high protective properties. View Full-Text
Keywords: aluminum alloy AlMg6; Al2O3 coating; phase composition; corrosion; stress corrosion; micro-arc oxidation aluminum alloy AlMg6; Al2O3 coating; phase composition; corrosion; stress corrosion; micro-arc oxidation
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Kyzioł, L.; Komarov, A. Influence of Micro-Arc Oxidation Coatings on Stress Corrosion of AlMg6 Alloy. Materials 2020, 13, 356.

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