工业纯铁和Fe-0.1Si合金热浸镀锌层的生长规律及其组织特征  

Growth and Microstrncture of Hot-Dtp Galvanizing Coating on Pure Iron and Fe-0.1Si Alloy

作　　者：涂浩[1,2] 王建华[1,2] 彭碧草[1] 苏旭平[1,2] 尹付成[1,2] 李智[1,2] 

机构地区：[1]湘潭大学机械工程学院材料设计研究所,湖南湘潭411105 [2]湘潭大学材料设计与制备技术湖南省重点实验室,湖南湘潭411105

出　　处：《材料保护》2009年第8期12-15,共4页Materials Protection

基　　金：湖南省科技厅重点项目(2007GK2010);湖南省自然科学基金资助项目(06JJ20076);湖南省教育厅重点资助项目(05A004)

摘　　要：以铁损来判断热浸镀锌的温度对镀锌层的影响,结果欠准;硅元素对镀锌存在Sandelin效应。这2种因素对锌镀层的生长、质量及性能都有重大的影响,且都难以控制。为此,以工业纯铁和Fe-0.1Si(0.1%,质量分数)合金薄片为热镀锌基材,探讨锌液温度和钢中硅元素对镀层生长和镀层组织的影响。利用扫描电镜对2种基材在450～530℃内的热镀锌层厚度及其组织进行了测量与分析。结果表明:工业纯铁在480℃下热镀锌时镀层生长最快,Fe-0.1Si合金在470℃热镀锌时镀层生长最快;在镀层生长最快的温度下,2种基材的镀层特征具有相似性;当镀锌温度超过500℃时,工业纯铁和Fe-0.1Si合金镀层中的ζ相消失,镀层由δ相组成。The thin plates of commercial pure iron and Fe-0. 1Si (0.1%, mass fraction) alloy were used as the substrates for galvanizing. The effects of galvanizing tem-perature and alloying element silicon on the growth and microstruc-ture of the galvanizing coating were investigated. The thickness and microstructure of the galvanizing coatings obtained at 450-530℃ on the two types of substrates were analyzed by means of scanning electron microscopy. Results show that the galvanizing coatings oncommercial pure iron and Fe-0. 1Si alloy grow at a fastest rate at 480 ℃ and 470 ℃, respectively, and the corresponding galvanizing coat-ings were similar in terms of microslructure. At a galvanizing tem-perature of above 500℃,ξ phase disappears and 8 phase dominates in the galvanizing coatings of the two types of substrates.

关 键 词：热浸镀锌 工业纯铁 Fe-0.1Si合金 锌液温度 硅元素 镀层厚度 生长规律 组织特征 

分 类 号：TG174.443[金属学及工艺—金属表面处理]