硅对活性钢热镀锌组织的影响  

Influence of Silicon on the Galvanized Coatings of Reactive Steels

作　　者：卢锦堂[1] 车淳山[1] 孔纲[1] 许乔瑜[1] 陈锦虹[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《材料科学与工程学报》2005年第6期822-824,828,共4页Journal of Materials Science and Engineering

摘　　要：将高硅活性钢板(0.37wt%Si)表面预镀纯Fe层后浸入450℃熔融锌中,研究热浸锌层组织的变化,特别是-αFe/Γ界面附近组织的变化规律。结果表明:钢中的Si会在钢基表面富集;随着钢基/镀层界面向钢基方向移动,富Si的-αFe破碎成粒子或絮状物,以类似克根达尔效应中惰性标记物的方式穿过Γ层进入δ层,从而促进δ向钢基方向生长并吞并附近的Γ相,令Γ相逐渐消失;与此同时,原来正常的镀层很快就转变为典型的高硅活性钢镀层。Steel sheets （0.37wt% Si） were immersed in molten zinc at 450℃ for different immersion times after they were electrodeposited a layer of pure Fe. The microstructure of the galvanized coating and the α-Fe/P interface were studied. The results show that excessive silicon is accumulated on the surface of the steel substrate. With the movement of α-Fe/P interface towards the substrate by the Fe/ Zn reaction, the silicon-rich α-Fe is peeled off from the substrate and broken into particles. The particles, much like the inert marker in a Kirkendall effect experiment, enter the δ layer through the Г layer because silicon-rich a-Fe can not be adsorbed in the Г layer. The particles dissolved in the δ layer accelerate the growth of the δ layer, resulting in the gradual disappearance of the Г layer. At the same time, the normal coating is quickly changed into the coating of the reactive steel.

关 键 词：热镀锌 活性钢 锌铁化合物 电镀铁 

分 类 号：TG174.443[金属学及工艺—金属表面处理]