Ceramic oxide coating formed on beryllium by micro-arc oxidation

被引：32

作者：

He, Shixiong ^{[1
]}

Ma, Yanlong ^{[2
]}

Ye, Hong ^{[2
]}

Liu, Xiangdong ^{[1
]}

Dou, Zuoyong ^{[1
]}

Xu, Qingdong ^{[1
]}

Wang, Haijun ^{[1
]}

Zhang, Pengcheng ^{[1
,3
]}

机构：

[1] Sci & Technol Surface Phys & Chem Lab, Mianyang, Sichuan, Peoples R China

[2] Chongqing Univ Technol, Coll Mat Sci & Engn, Chongqing 400054, Peoples R China

[3] POB 9-35, Jiangyou City 621908, Sichuan Provinc, Peoples R China

来源：

CORROSION SCIENCE | 2017年 / 122卷

关键词：

Beryllium; MAO; Na2CO3; electrolyte; Coating structure; EIS; ELECTROCHEMICAL CORROSION BEHAVIOR; PLASMA ELECTROLYTIC OXIDATION; ANODIC FILM GROWTH; ALUMINUM-ALLOY; CU ALLOY; MAGNESIUM; RESISTANCE; BREAKDOWN;

D O I：

10.1016/j.corsci.2017.04.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Beryllium was oxidized at a current density of 10 mA cm(-2) in a 0.5 M Na2CO3 (pH = 11.2) electrolyte to understand the micro-arc oxidation (MAO) process. Different oxidation stages were investigated by analysing the voltage time responses and coating morphology. 'Electric breakdown' accompanied by sparks travelling across the metal/electrolyte interface occurs when the voltage rises above a certain point (similar to 202 V), leading to the formation of an off-white 'ceramic-like' BeO coating. The MAO coating consists of two layers-an inner barrier layer-and an outer porous layer and shows improved corrosion resistance and insulation properties. XPS and XRD indicate that the coating has a chemical composition of BeO and is crystalline. Further, corrosion resistance and insulation properties of the coating were estimated by EIS analysis.

引用

页码：108 / 117

页数：10

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