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Influence of trace As content on the microstructure and corrosion behavior of the AZ91 alloy in different metallurgical conditions

查看全文 作　　者：Zhe [1]Zhang;Guohua [1]Wu;Andrej [2]Atrens;Wenjiang [1]Ding 高影响力作者 机构地区：[1]National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;[2]School of Mechanical and Mining Engineering,the University of Queensland,Brisbane,Qld 4072,Australia高影响力机构 出　　处：《Journal of Magnesium and Alloys》索引2020年第8卷第1期,共17页高影响力期刊 基　　金：This work was supported by the National Natural Science Foundation of China(No.51775334,51821001);National Defense Science and Technology Innovation Special Zone Project(No.002-002-01);the National Key R&D Program of China(Grant no.2016YFB0701205)。 摘　　要：The influence of trace As content(0.04,0.05,0.06 wt%)on the microstructure and corrosion behavior of AZ91 alloy in different metallurgical conditions(as-cast,as-quenched,peak-aged)was firstly investigated.It is found that the corrosion resistance of AZ91 alloy in all conditions is significantly enhanced by As addition,mainly due to cathodic toxication,melt purification and incidence reduction of local corrosion.As alloying leads to the formation of Mg 3 As 2 and makes the β-Mg 17 Al 12 phase less continuous in the as-cast alloys.The alloy containing 0.06 wt%As obtains a higher corrosion rate than those of the alloy containing 0.05 wt%As owing to a more discontinuity of β phase.The β phase is dissolved into the matrix in the as-quenched alloys and reprecipitates along the grain boundaries after aging.The more continuous β phase distribution in the peak-aged alloys contributes to corrosion resistance.The corrosion rates are in the order of as-quenched>as-cast>peak-aged.The lowest corrosion rate(0.67 mm/y)in 3.5 wt%NaCl solution is obtained in the peak-aged AZ91-0.05As alloy,which is over 70%lower than that of as-cast AZ91 alloy(2.22 mm/y). 关 键 词：Magnesium alloy AZ91 MICROSTRUCTURE Corrosion behavior
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