UDC
620.1:629.7.023
DOI
10.18577/2307-6046-2019-0-8-67-78
Article PDF (Russian) (1.31 MB)
How to cite
Antipov V.V., Medvedev I.M., Kutyrev A.E., Volkov I.A. Rapid assessment of hot water sealed anodic oxide coatings protective properties during NaCl immersion testing // Proceedings of VIAM. 2019. No. 8 (80). Ст. 08. URL: https://www.viam-works.ru. DOI: 10.18577/2307-6046-2019-0-8-67-78.

Rapid assessment of hot water sealed anodic oxide coatings protective properties during NaCl immersion testing

Antipov V.V., Medvedev I.M., Kutyrev A.E., Volkov I.A.
Abstract

Multilayer systems based on anodizing and painting are used in the aircraft industry for aluminum alloys corrosion protection. Porous anodic oxide coatings with insufficient corrosion protection properties are formed during anodizing in chromium-free electrolytes. These coatings are sealed for better corrosion protection. Hot water sealing is one of the most widely used methods to enhance aluminum anodic oxide coatings protective properties. Lengthy neutral salt spray tests (usually at least 336 h) are used for protective properties assessment. In the present study, EIS data was fitted using equivalent electrical circuits for investigation of changes in coating parameters during 3% NaCl solution immersion up to 1440–3600 h. Coatings were obtained by 1163, V-1461, V96C3p.ch. aluminum alloys anodizing in sulfuric acid water solution for 15, 30, 45 minutes, followed by hot water sealing in deionized water. Changes in impedance modulus at low frequencies (so-called «degradation function») cannot be used to assess the protective properties of sealed anodic oxide coatings. The electrochemical criterion for quick evaluation of sealed anodic oxide coatings protective properties (time to first corrosion spots) was introduced – change in capacitive parameter of sealing CPEseal-T during the first 24 h of testing in NaCl solution.

Keywords
anodic oxide coatings, electrochemistry, EIS, aluminum alloys.
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