无铵盐助镀条件下热浸镀锌层组织的分析  

Microstructure of Hot-Dipped Zn Coating in Fluxing Without Ammonium

作　　者：王胜民[1] 何明奕[2] 赵晓军[2] 黄国雄[1,2] 刘丽[3] 

机构地区：[1]昆明理工大学机电工程学院,云南昆明650093 [2]昆明理工大学材料科学与工程学院,云南昆明650093 [3]云南民族大学生化学院,云南昆明650031

出　　处：《昆明理工大学学报（自然科学版）》2011年第6期26-29,共4页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：云南省自然科学基金项目(2011FZ053);云南省教育厅重点基金项目(2010Z018)

摘　　要：针对热浸镀锌过程传统助镀工艺的烟尘污染问题,在热浸镀锌工艺中采用无铵助镀前处理制备镀锌层,利用SEM研究了无铵助镀处理对镀层组织的影响.研究结果表明,无铵助镀时,δ相层变得更加致密;δ相层外面相邻的ζ相变得更加细小且柱状结构表现不明显,部分ζ相分布于η相中.增加助镀剂中的Fe2+含量会加剧锌铁合金反应,导致镀层中合金相层快速增长,出现了板条状ζ相,甚至造成ζ相的异常长大.与传统锌—铵助镀工艺相比,无铵助镀热浸镀锌层的组织结构发生了改变.Zinc coating is prepared by hot dip galvanizing with no-ammonium fluxing for the dust and fume extraction.The microstructure of the coating is studied by scanning electron microscopy（SEM）.The results show that the coating has a fine grain ζ layer on the top of a δ layer appears in the form of coherent and compact crystallites when the specimen is prepared without ammonium.It is found that some ζ phases coexist with η phases in the coating.The investigation of no-ammonium fluxing has verified that the concentration of Fe2＋ in fluxes infuence the growth of ζ phase.This results in the faster growth of ζ phase with increasing of concentration of Fe2＋ in fluxes,even the morphology of ζ phase changes to lath.The microstructure of the coating is different from that obtained by traditional hot dipping with zinc-ammonium chloride fluxes.

关 键 词：无铵助镀 热浸镀锌 组织结构 碳氟表面活性剂 镀锌层 

分 类 号：TG174.443[金属学及工艺—金属表面处理]