锌浴温度对0.49%Si活性钢热浸镀锌层组织的影响  

Effects of Zinc Bath Temperature on Microstructure of Hot Dip Galvanized 0.49%Si Reactive Steel

作　　者：孔纲[1] 刘仁彬[1] 车淳山[1] 卢锦堂[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640

出　　处：《材料工程》2011年第1期81-86,共6页Journal of Materials Engineering

基　　金：国际铅锌研究组织项目(ILZRO/IZA/2009023);中央高校基本科研业务费专项资金项目(2009ZM0072)

摘　　要：研究了高硅钢（0.49%Si,质量分数）在不同浸镀温度（440,480,520,560,600℃）和不同浸镀时间（1,3,5,10min）下的热镀锌试样镀层组织,探讨了浸镀温度和浸锌时间对镀层组织的影响。SEM/EDS结果表明：440℃和480℃热镀锌,镀层由薄而连续δ层和破碎的块状ζ相组成,无Γ相。ζ相生长过快,镀层过厚、灰暗、黏附性差,镀层生长主要由界面反应机制控制;520℃热镀锌时,镀层由极薄的Γ层、致密δk层和疏松的δp层组成,镀层生长主要受扩散机制控制;560℃和600℃镀锌时,镀层为Γ层和致密的δ相层,部分δ粒子弥散分布在η层中,镀层生长为扩散机制控制并伴随有显著的δ溶解过程。最佳高温镀锌温度应在520~560℃。The hot dip galvanized samples of high silicon reactive steel（0.49%Si,mass fraction） were prepared by immersed in molten zinc bath at different temperatures（440,480,520,560,600℃） for different time（1,3,5,10min）.The effects of zinc bath temperature and immersion time on the galvanized coatings were discussed.SEM/EDS results show that at 440℃ and 480℃,the coating is composed of thin δ layer and lumpy ζ phase.No Γ phase is found.The excessive growth of ζ produces an undesirable coating with excessive thickness,gray appearance and bad adhesion.The growth rate of coating obeys by interfacial reaction mechanism.At 520℃,the coating is composed of extremely thin Γ layer,compact δk layer and loose δp layer.The growth rate of coating is controlled by diffusion mechanism.At 560,600℃,the coating is a Γ layer and a compact δ layer.Some δ particles are dispersed in η layer.The growth rate of coating is controlled by diffusion mechanism,accompanying the dissolve of δ from coating into molten zinc bath.The optimized operating temperature for high temperature galvanizing should be controlled in the range of 520-560℃.

关 键 词：热浸镀锌 活性钢 温度 显微组织 

分 类 号：TG174.443[金属学及工艺—金属表面处理]