Chemical Conversion Coatings on Magnesium Alloys - A Comparative Study

被引：0

作者：

Shashikala, A. R. ^{[1
]}

Umarani, R. ^{[1
]}

Mayanna, S. M. ^{[2
]}

Sharma, A. K. ^{[1
]}

机构：

[1] ISRO Satellite Ctr, Thermal Syst Grp, Bangalore 560017, Karnataka, India

[2] Bangalore Univ, Dept Chem, Bangalore 560001, Karnataka, India

来源：

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE | 2008年 / 3卷 / 09期

关键词：

Magnesium Alloys; Polarization; Electrochemical Impedance Spectroscopy; Thermal Cycling; Humidity Test;

D O I：

暂无

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Comparative studies on some of the important chemical conversion coatings viz, stannate, cerium oxide, chromate and galvanic black anodizing on magnesium alloy AZ31B have been conducted. The surface morphology and composition of the coatings were examined by SEM and EDX techniques. Corrosion resistance of these coatings was compared by polarization studies, salt spray test and electrochemical impedance spectroscopy [EIS]. The space worthiness of the coatings was evaluated by environmental tests viz., humidity, thermal cycling and thermo vacuum performance. The optical properties (solar absorptance and infrared emittance) of the coatings were measured before and after environmental tests. The corrosion resistance investigated was found in the following order, Galvanic black anodizing > Chromate conversion coating > Cerium Oxide coating > Stannate coating.

引用

页码：993 / 1004

页数：12

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