Microstructure and Corrosion Performance of Mg-Al-Zn Alloy Contained Ca for Automobile

Xiao Dongling; Yang Ming

doi:10.15980/j.tzzz.2014.05.038

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Microstructure and Corrosion Performance of Mg-Al-Zn Alloy Contained Ca for Automobile
Vol. 34, Issue 5, Pages: 535-538(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.05.038

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[1]肖冬玲,杨明.汽车用Mg-6Al-1.2Zn合金的组织与腐蚀性能[J].特种铸造及有色合金,2014,34(05):535-538.

Xiao Dongling, Yang Ming. Microstructure and Corrosion Performance of Mg-Al-Zn Alloy Contained Ca for Automobile. [J]. Special Casting & Nonferrous Alloys 34(5):535-538(2014)
[1]肖冬玲,杨明.汽车用Mg-6Al-1.2Zn合金的组织与腐蚀性能[J].特种铸造及有色合金,2014,34(05):535-538. DOI： 10.15980/j.tzzz.2014.05.038.

Xiao Dongling, Yang Ming. Microstructure and Corrosion Performance of Mg-Al-Zn Alloy Contained Ca for Automobile. [J]. Special Casting & Nonferrous Alloys 34(5):535-538(2014) DOI： 10.15980/j.tzzz.2014.05.038.

摘要

以Ca微合金化的Mg-6Al-1.2Zn系合金为研究对象

利用电化学法、失重法等研究了Ca含量对合金铸态和热处理态试样的组织与耐腐蚀性能的影响。结果表明

不同Ca含量的Mg-6Al-1.2Zn-xCa合金的铸态组织主要由α-Mg固溶体和β-Al12Mg17相组成;随着Ca含量的不同

合金中β-Al12Mg17相的数量与形态存在一定的差异。经过固溶时效处理后合金的腐蚀电位都发生了正向移动

腐蚀电流降低

合金的耐腐蚀性能得到提高

Ca含量为1%的Mg-Al-Zn-Ca合金具有优良的耐腐蚀性能。

Abstract

Effects of Ca addition on microstructure and corrosion behavior of Mg-Al-Zn alloys at as-cast state and heat treatment state were investigated by the electrochemical method

weight loss method. The results show that the as-cast microstructure of Mg-Al-Zn-Ca alloy with varied Ca addition is composed of primary Mg phase andβ-Al12Mg17.With different Ca addition

there exists difference in amounts and shape ofβ-Al12Mg17phase in the alloy.After solid solution treatment

corrosion potential is shifted to positive

and corrosion current is decreased

which takes the attribution to improvement of corrosion resistance of the alloy prepared.The Mg-Al-Zn alloy with 1% Ca addition exhibits desirable corrosion resistance.