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Materials 2017, 10(6), 609; doi:10.3390/ma10060609

Microarc Oxidation Coating Combined with Surface Pore-Sealing Treatment Enhances Corrosion Fatigue Performance of 7075-T7351 Al Alloy in Different Media

1
Department of Engineering Mechanics, School of Aerospace Engineering, AML, Tsinghua University, Beijing 100084, China
2
Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Received: 6 April 2017 / Revised: 12 May 2017 / Accepted: 26 May 2017 / Published: 2 June 2017
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Abstract

Rotating bending fatigue tests have been performed to evaluate the corrosion fatigue performance and its influence factors of 7075-T7351 Al alloy in different media, namely air and a 5.0 wt % NaCl aqueous solution. All samples were coated by microarc oxidation (MAO) coating technology; some samples were followed by an epoxy resin pore-sealing treatment. Microscopic analyses of the surfaces and fracture cross-sections of samples were carried out. The results reveal that the sample with a MAO coating of 10 μm thickness and pore-sealing treatment by epoxy resin possesses optimal corrosion fatigue performance in the different media. The MAO coating with a pore-sealing treatment significantly improves the corrosion fatigue limit of 7075-T7351 Al alloy. View Full-Text
Keywords: Al alloy; corrosion fatigue; microarc oxidation coating; pore-sealing treatment; microscopic analysis Al alloy; corrosion fatigue; microarc oxidation coating; pore-sealing treatment; microscopic analysis
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MDPI and ACS Style

Yang, H.-H.; Wang, X.-S.; Wang, Y.-M.; Wang, Y.-L.; Zhang, Z.-H. Microarc Oxidation Coating Combined with Surface Pore-Sealing Treatment Enhances Corrosion Fatigue Performance of 7075-T7351 Al Alloy in Different Media. Materials 2017, 10, 609.

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