IMPROVED CORROSION RESISTANCE OF AZ31B MAGNESIUM ALLOY BY ELECTROPLATING OF Al-Mn ALLOY

J Chin Soc Corr Pro

2010, Vol. 30

Issue (4): 300-305 DOI:

Research Articles

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IMPROVED CORROSION RESISTANCE OF AZ31B MAGNESIUM ALLOY BY ELECTROPLATING OF Al-Mn ALLOY

ZHANG Jifu, ZHANG Wei, DU Keqin, YAN Chuanwei, WANG Fuhui

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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Abstract

Al-Mn alloy coatings were deposited on zinc pre-plated magnesium alloy AZ31B from a bath of inorganic molten salts. Then the microstructure, composition and phase constituents of the coatings were investigated by scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDX), and X-ray diffraction (XRD). The corrosion and wear resistance of the coatings was evaluated by potentiodynamic polarization and microhardness measurements, respectively. The results indicated that the typical processing parameters such as composition of molten salts, cathode currency density and temperature had important effect on the morphology and chemical composition of the Al-Mn alloy, and the alloy coating with various composition present different phase constitution. It showed that the Al-Mn alloy coating exhibited a much higher corrosion potential and lower corrosion rate than that of Mg alloy AZ31B, so it can well protect the magnesium alloy AZ31B against corrosion.

Key words: magnesium alloy electroplating Al-Mn alloy corrosion resistance

Received: 03 July 2009

ZTFLH:

TG174.4

Corresponding Authors: YAN Chuanwei E-mail: cwyan@imr.ac.cn

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Cite this article:

. IMPROVED CORROSION RESISTANCE OF AZ31B MAGNESIUM ALLOY BY ELECTROPLATING OF Al-Mn ALLOY . J Chin Soc Corr Pro, 2010, 30(4): 300-305.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I4/300

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