Effects of Na2WO4 on the MAO coatings on AZ80. (2nd August 2020)

• Record Type: Journal Article
• Authors: Li, Z. M.; Chen, Z. G.; Feng, S. S.; Zhao, T. Y.; Wang, W. Z.
• Is Part Of: Surface engineering. Volume 36:Number 8(2020)
• Page Start: 817
• Page End: 826
• Publication Date: 2020-08-02
• Subjects: AZ80 magnesium alloy -- micro-arc oxidation -- Na2WO4 -- microstructure -- property; Surfaces (Technology) -- Periodicals; Coatings -- Periodicals; 620.4405
• DOI: 10.1080/02670844.2019.1656371
• Languages: English
• ISSNs: 0267-0844

Abstract

ABSTRACT: The coatings were prepared with different Na2 WO4 concentration on AZ80 magnesium alloy by micro-arc oxidation. The scanning electron microscopy, energy-dispersive spectrometry and X-ray diffractometer were used to evaluate the microstructure of the coatings. The mechanical properties of coatings were tested by friction and wear tester and microhardness tester. The corrosion resistance of coatings was studied by electrochemical workstation and slow strain rate tensile test. The results show that the addition of Na2 WO4 can promote the growth of the MAO coating, improve the thickness and continuity of the coating, and make the oxide film dense and smooth. The addition of an appropriate amount of Na2 WO4 can increase the hardness of the MAO coating, improve the wear resistance and the corrosion resistance of the MAO coating. When the content of Na2 WO4 was 0.5 g L –1, the tendency of stress corrosion cracking can be effectively reduced.