某新型洗烘一体滚筒洗衣机铝合金烘道腐蚀分析  

Analysis on corrosion of the aluminum alloy drying tunnel of a VA washing machine

作　　者：韦刚 王红强 汤志鸣 WEI Gang;WANG Hongqiang;TANG Zhiming(Whirlpool(China)Co.,Ltd.Hefei,230088)

机构地区：[1]惠而浦(中国)股份有限公司,安徽合肥230088

出　　处：《家电科技》2022年第2期72-75,共4页Journal of Appliance Science & Technology

摘　　要：在某新型压铸铝合金烘道部件开发过程中,观察到发生了早期腐蚀失效的现象。针对此现象,从腐蚀产物组成、显微组织结构及腐蚀机理等方面入手,讨论了腐蚀形成的原因。结果表明,该部件的压铸铝合金材料由先共晶α-Al及(Al+Si)共晶构成;材料的腐蚀以电化学腐蚀为主,形成的腐蚀产物主要为Al(OH)_(3)及少量AlOOH;腐蚀后的材料表层残留为黑色的Si及富Fe相,结构疏松。适当降低Fe、Si含量及优化压铸工艺可改善铝合金烘道显微结构,提高其耐腐蚀性能。During the developing process of a new type drying tunnel of a certain VA washing machine,early corrosion of the drying tunnel was observed.In order to figer out the reason of the corrosion,the corrosion product,microstructure and corrosion mechanism of the aluminum alloy were investigated.The results show that the die casting aluminum alloy was composed of the pre-eutecticα-Al and eutectic(Al+Si);corrosion of the die casting aluminum alloy drying tunnel mainly follows the electrochemical corrosion mechanism,produces Al(OH)_(3)and a small amount of AlOOH.The corroded aluminum alloy consists of the remained Si and Fe-rich particles on the surface,which is black and loose.In terms of the reduction of the Fe and Si contents and the optimization of the die-casting technique parameters,the microstructure and the corrosion resistant property of the aluminum alloy drying tunnel could be improved.

关 键 词：压铸铝合金 腐蚀产物 腐蚀机理 显微结构 

分 类 号：TG172[金属学及工艺—金属表面处理]