Excellent corrosion resistance of P and Fe modified micro-arc oxidation coating on Al alloy

被引：54
作者：
Ji, Shunping [1 ]
Weng, Yuchang [1 ]
Wu, Zhongzhen [1 ]
Ma, Zhengyong [1 ]
Tian, Xiubo [1 ]
Fu, Ricky K. Y. [2 ]
Lin, Hai [1 ]
Wu, Guosong [3 ]
Chu, Paul K. [2 ]
Pan, Feng [1 ]
机构：
[1] Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Peoples R China
[2] City Univ Hong Kong, Dept Phys & Mat Sci, Tat Chee Ave, Kowloon, Hong Kong, Peoples R China
[3] Hohai Univ, Coll Mech & Mat, Nanjing, Jiangsu, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 710卷
关键词：
Aluminum alloy; Micro-arc oxidation; Phosphate; Corrosion resistance; PLASMA ELECTROLYTIC OXIDATION; AZ91D MAGNESIUM ALLOY; ALUMINUM-ALLOY; PHOSPHATE COATINGS; CERAMIC COATINGS; MICROSTRUCTURE; PERFORMANCE; BEHAVIOR; SURFACE; FILMS;
D O I：
10.1016/j.jallcom.2017.03.303
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The corrosion resistance of aluminum and its alloys requires improvement in some applications. In this work, a 20 gm thick compact alumina coating doping Fe and P is obtained on the substrate of LY12 Al alloy by combining micro-arc oxidation (MAO) and phosphating to improve the corrosion resistance. The reaction mechanism is investigated and proposed. The coating shows a relatively small surface roughness (Ra = 0.5 mu m) and a high Vickers hardness (1200 HV). The corrosion resistance is evaluated by the salt spraying test and Tafel polarization and a lifetime of up to 1800 h and a passivation potential of above 10 V are observed. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：452 / 459
页数：8
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