A Comparative Study of Corrosion Behavior of Hard Anodized and Micro-Arc Oxidation Coatings on 7050 Aluminum Alloy

被引：35
作者：
Shao, Lianlian [1 ]
Li, Hongtao [1 ,2 ]
Jiang, Bailing [1 ]
Liu, Cancan [1 ]
Gu, Xin [1 ]
Chen, Dichun [3 ]
机构：
[1] Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China
[2] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
[3] Xiamen Adv Mat Acad, Luoyang Ship Mat Res Inst, Xiamen 361006, Peoples R China
来源：
METALS | 2018年 / 8卷 / 03期
基金：
中国国家自然科学基金;
关键词：
micro-arc oxidation; hard anodization; microstructure; phase composition; corrosion behavior; SEALING TREATMENT; AL-ALLOY; MICROSTRUCTURE; RESISTANCE; ANODIZATION;
D O I：
10.3390/met8030165
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Two kinds of metal oxide coatings were fabricated on 7050 Al alloy by hard anodization (HA) and micro-arc oxidation (MAO) techniques. The microstructure, phase composition, and corrosion behavior of the two coatings were studied by scanning electron microscopy, X-ray diffraction, and corrosion tests, respectively. When compared with the HA coating, the MAO one was more effective to isolate the substrate from the corrosive environment. In addition, as confirmed by electrochemical tests, the MAO coating was of better corrosion resistance than the HA coating. Furthermore, it was revealed by neutral salt spray test that the MAO coating could protect substrate alloy over 1140 h, while the HA coating can only protect substrate alloy for 46 h due to the amorphous composition and through thickness defects (micro-pores and micro-cracks).
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页数：10
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