Comparative analysis for corrosion resistance of micro-arc oxidation coatings on coarse-grained and ultra-fine grained AZ91D Mg alloy

被引：61

作者：

Jiang, Jinghua ^{[1
,2
]}

Zhou, Qi ^{[1
]}

Yu, Jisen ^{[3
]}

Ma, Aibin ^{[1
,2
]}

Song, Dan ^{[1
,2
]}

Lu, Fumin ^{[1
]}

Zhang, Liuyan ^{[1
]}

Yang, Donghui ^{[1
]}

Chen, Jianqing ^{[1
]}

机构：

[1] Hohai Univ, Coll Mech & Mat, Nanjing 210098, Jiangsu, Peoples R China

[2] Changzhou Hohai Technol Co Ltd, Natl Engn Res Ctr Water Resources Efficient Utili, Changzhou 213164, Peoples R China

[3] Baoyou Elect Equipment Mfg Co Ltd, Kunshan 215300, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2013年 / 216卷

基金：

中国国家自然科学基金;

关键词：

Magnesium alloy; Ultra-fine grained (UFG); Micro-arc oxidation coating; Corrosion resistance; Morphology; MAGNESIUM ALLOY; CONVERSION LAYERS; ALUMINUM; MICROSTRUCTURE; BEHAVIOR; PHOSPHATE; SILICATE; IRON;

D O I：

10.1016/j.surfcoat.2012.11.055

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

By micro-arc oxidation (MAO) process in a silicate electrolyte, the oxide coatings were successfully formed on a coarse-grained casting AZ91D Mg alloy and an ultra-fine grained (UFG) one fabricated by equal-channel-angular-pressing (ECAP). The effect of substrate microstructure on morphologies and corrosion resistance of the MAO coatings on AZ91D alloys were investigated by scanning electron microscopy observation, immersion tests and electrochemical impedance spectrum (EIS) measurements. In comparison, the MAO coating on the UFG Mg alloy has lower corrosion rate and larger R-f value. Three factors enhance the corrosion resistance. The first is the MAO coating with uniform size and distribution of micro-pores due to homogenous micro-arc discharge. Secondly, the number of open holes decreases due to the finer beta-phase after ECAP process. The most important one is the higher compactness and thickness of the coating on the UFG Mg alloy. It implies that the MAO coatings have a great potential in surface protection of UFG Mg alloys. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：259 / 266

页数：8

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