Application of Ce-V/sol-gel composite coating for corrosion protection of AM60B magnesium alloy

被引：36
作者：
Nezamdoust, S. [1 ]
Seifzadeh, D. [1 ]
机构：
[1] Univ Mohaghegh Ardabili, Fac Basic Sci, Dept Appl Chem, Phys Chem Res Lab, Ardebil 5619911367, Iran
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2017年 / 27卷 / 02期
关键词：
magnesium alloy; corrosion; conversion coating; sol-gel; CERIUM CONVERSION COATINGS; MICRO-ARC OXIDATION; RESISTANCE; 3-GLYCIDOXYPROPYLTRIMETHOXYSILANE; BEHAVIOR; SURFACE; METALS; FILMS;
D O I：
10.1016/S1003-6326(17)60039-6
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Application of a composite coating on AM60B magnesium alloy consisting of cerium-vanadium conversion coating and a hybrid sol-gel layer was investigated. Scanning electron microscopy and energy dispersive X-ray spectroscopy analyses revealed a cracked nodular structure for the cerium-vanadium conversion coating which was mainly composed of O, Ce, V, and Mg atoms. All the cracks in the conversion coating were completely sealed by a thin, compact and defect-free hybrid sol-gel film. Potentiodynamic polarization and electrochemical impedance spectroscopy experiments in Harrison's solution showed that the cerium-vanadium conversion coating provides minimal protection against corrosion while the composite coating significantly increases the corrosion resistance of the magnesium alloy. Sol-gel film provides protection against corrosion by sealing cracks in the cerium-vanadium conversion coating and acting as a barrier. Scanning electron microscopy analyses after polarization tests confirmed the results obtained by the electrochemical tests.
引用
收藏
页码：352 / 362
页数：11
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