EFFECT OF ALTERNATING CURRENT MODULATED PASSIVATION ON THE CORROSION RESISTANCE OF STANNATE CONVERSION COATING ON AZ91D ALLOY

J Chin Soc Corr Pro

2010, Vol. 30

Issue (5): 341-346 DOI:

Research Articles

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EFFECT OF ALTERNATING CURRENT MODULATED PASSIVATION ON THE CORROSION RESISTANCE OF STANNATE CONVERSION COATING ON AZ91D ALLOY

LIU Xiaolan¹, CHEN Jie¹, CAO Jingtao¹,CUI Zhongyu¹, ZHANG Tao¹,SHAO Yawei¹, MENG Guozhe¹, WANG Fuhui^1,2

1. Corrosion and Protection Laboratory, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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Abstract By using alternating current (AC) modulated passivation technique, the formation process of stannate conversion coating could be controlled. The microstructure morphology of the conversion coating was observed by scanning electron microscopy. Polarization curves and electrochemical impedance spectra (EIS) were examined to understand the effect of the AC passivation on the corrosion resistance of the conversion coating. The experimental results revealed that the surface of AZ91D magnesium alloy after the AC passivation was covered by the hemispherical particles whth larger size than that for traditional immersion conversion coating (imm-CC). The corrosion resistance of the conversion coating was significantly improved as a result of the AC passivation.

Key words: magnesium alloy electrochemical impedance spectroscopy alternating current modulated passivation conversion coating corrosion resistance

Received: 14 April 2009

ZTFLH:

TG174.36

Corresponding Authors: ZHANG Tao E-mail: zhangtao@hrbeu.edu.cn

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LIU Xiaolan, CHEN Jie, CAO Jingtao,CUI Zhongyu, ZHANG Tao,SHAO Yawei, MENG Guozhe, WANG Fuhui. EFFECT OF ALTERNATING CURRENT MODULATED PASSIVATION ON THE CORROSION RESISTANCE OF STANNATE CONVERSION COATING ON AZ91D ALLOY. J Chin Soc Corr Pro, 2010, 30(5): 341-346.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I5/341

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