硅含量对热浸镀Zn-40%Al合金层凝固组织及耐蚀性的影响  

Effect of Silicon Content on Solidified Structure and Corrosion Resistance of Hot-Dipped Zinc-40% Aluminum Alloy Coating

作　　者：李振锋[1,2] 苏旭平[1,3] 涂浩[3] 高翠平[1,2] 王建华[3] 

机构地区：[1]湘潭大学材料设计及制备技术湖南省重点实验室,湖南湘潭411105 [2]中国南方航空工业(集团)有限公司,湖南株洲412002 [3]常州大学先进金属材料常州市重点实验室,江苏常州213164

出　　处：《材料保护》2012年第5期9-11,31,共4页Materials Protection

基　　金：国家自然科学基金(50971111;50971110);江苏省青蓝工程;常州市国际合作项目(CZ20110014)

摘　　要：为了改善Zn-40%Al合金热浸镀层的性能,在Zn-40%Al合金中加入了Si,研究了不同硅含量对Zn-40%Al合金镀层凝固组织及耐蚀性的影响。结果表明:当硅含量在0.5%～1.5%时,随着硅的增加,镀层凝固组织中的铝硅共晶组织不断增多,富铝相晶粒不断被细化,富铝枝晶相排列越来越规则,镀层的耐蚀性不断增强;当硅达到2.0%时,镀层会出现漏镀缺陷;硅的加入能在镀层表面形成具有优良腐蚀性的Al3.21Si0.47,有利于镀层耐蚀性的提高。Si was incorporated into hot-dipped Zn-40%Al alloy coating to improve the corrosion resistance.The effect of Si content on the solidified structure and corrosion resis-tance of the hot-dipped Zn-40%Al alloy coating was investigated.It was found that the amount of Al-Si eutectic in the solidified structure of Zn-Al alloy coating increased with increasing silicon content in a range of 0.5%~ 1.5%(mass fraction).Besides,the grains of Al-rich phases were refined,and the arrangement of Al-rich dendritic phases was better ordered.As a result,the corrosion resistance of the alloy coating was improved.As the content of Si in the alloy coating reached 2.0%,plating leakage was observed in the hot-dipped Zn-Al alloy coating.In general,the introduction of Si into the hot-dipped Zn-Al alloy coating gave rise to Al3.21Si0.47 phase with good corrosion resis-tance,which helped to improve the corrosion resistance of the alloy coating.

关 键 词：Zn-40%Al热浸镀层 硅元素 镀层凝固组织 晶粒细化 耐蚀性 腐蚀产物 

分 类 号：TG174.44[金属学及工艺—金属表面处理]