Ca-based sealing of plasma electrolytic oxidation coatings on AZ91 Mg alloy

被引：23
作者：
Lu, Xiaopeng [1 ]
Ma, Jirui [1 ]
Mohedano, Marta [2 ]
Pillado, Borja [2 ]
Arrabal, Raul [2 ]
Qian, Kun [3 ]
Li, Yan [1 ]
Zhang, Tao [1 ]
Wang, Fuhui [1 ]
机构：
[1] Northeastern Univ, Shenyang Natl Lab Mat Sci, 3-11 Wenhua Rd, Shenyang 110819, Peoples R China
[2] Univ Complutense, Fac Ciencias Quim, Dept Ingn Quim & Mat, Madrid 28040, Spain
[3] Southeastern Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2021年 / 417卷 / 417期
基金：
中国国家自然科学基金;
关键词：
Magnesium; Plasma electrolytic oxidation; Sealing; Corrosion resistance; MAGNESIUM ALLOY; CORROSION PROTECTION; AZ31; RESISTANCE; INHIBITOR; BIODEGRADATION; PERFORMANCE; MECHANISM; FILM; XPS;
D O I：
10.1016/j.surfcoat.2021.127220
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Plasma electrolytic oxidation (PEO) coatings on AZ91 Mg alloy were sealed in calcium nitrate solutions at different pH values (3, 4 and 5). Sodium dodecyl sulfate (SDS) was added to study the effect of SDS on the corrosion resistance of the sealed coatings. The microstructure, chemical composition and corrosion resistance of the coatings were investigated by means of SEM, XPS, XRD and electrochemical corrosion tests. The corrosion performance of the coatings was improved due to precipitation of Ca-containing precipitate. Low pH and SDS addition enhanced hydroxyapatite precipitation and produced hydrophobic coatings with worse paint adhesion but better corrosion resistance.
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页数：12
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