HIGH TEMPERATURE STEAM CORROSION OF MICROARC OXIDATION COATINGS ON 6061 ALUMINUM ALLOY AT 300∘C/3 MPa STEAM

Yao Qu, Chaolin Yang, Xiaoyue Jin, Jiancheng Du and Wenbin Xue
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Yao Qu: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Beijing Radiation Center, Beijing 100875, P. R. China
Chaolin Yang: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Beijing Radiation Center, Beijing 100875, P. R. China
Xiaoyue Jin: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Beijing Radiation Center, Beijing 100875, P. R. China
Jiancheng Du: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Beijing Radiation Center, Beijing 100875, P. R. China
Wenbin Xue: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Beijing Radiation Center, Beijing 100875, P. R. China

Surface Review and Letters (SRL), 2021, vol. 28, issue 01, 1-11

Abstract: The structural and phase transformation of microarc oxidation (MAO) coatings on 6061 aluminum alloy at 300∘C/3MPa steam were evaluated. After 10 days steam corrosion, the weight loss of coated alloys with 15μm and 75μm thickness was only about 1/10 and 1/50 of weight gain of bare alloy, respectively. The γ-Al2O3 and α-Al2O3 phases in the MAO coatings were stable at 300∘C/3MPa steam, but many fine needle-like or brick-like boehmite crystalline particles also appeared on coating surface. The boehmite had a large influence on the permittivity of coatings at low frequency. The MAO treatment on 6061 aluminum alloy improved its corrosion resistance at high-temperature and high-pressure steam.

Keywords: Microarc oxidation; 6061 aluminum alloy; high temperature and high pressure; steam corrosion; phase transformation (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X20500304

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