预电镀铁对活性钢热镀锌层的影响

华南理工大学学报（自然科学版） ›› 2006, Vol. 34 ›› Issue (10): 62-66.

预电镀铁对活性钢热镀锌层的影响

车淳山卢锦堂许乔瑜孔纲睢润舟

华南理工大学材料科学与工程学院，广东广州 510640

收稿日期:2005-12-05 出版日期:2006-10-25 发布日期:2006-10-25
通信作者: 车淳山(1975-)，男，博士，讲师，主要从事金属材料表面物理与化学研究 E-mail:chshche@seut.edu.cn
作者简介:车淳山(1975-)，男，博士，讲师，主要从事金属材料表面物理与化学研究

Influence of Fe-Electr0deposited Pretreatment on Galvanized Coatings of Reactive Steels

Che Chun-shan Lu Jin-tang Xu Qiao-yu Kong Gang Sui Run-zhou

School of Materials Science and Engineering,Sout China Univ.of Tech.,Guangzhou 510640,Guangdong,China

Received:2005-12-05 Online:2006-10-25 Published:2006-10-25
Contact: 车淳山(1975-)，男，博士，讲师，主要从事金属材料表面物理与化学研究 E-mail:chshche@seut.edu.cn
About author:车淳山(1975-)，男，博士，讲师，主要从事金属材料表面物理与化学研究

摘要/Abstract

摘要： 研究了5种含硅钢板(含硅量分别为0．04%，0．09% ，0．14% ，0．28%和0．36%)预电镀铁后热浸锌时镀层中合金相的形成和生长规律．结果表明：预电镀铁能够显著抑制活性钢镀锌合金层的快速生长．对于Sandelin钢、薄的过Sandelin钢和含硅量较低(约0．28%)的过Sandelin钢，可在其表面预电镀厚度不超过10μm的铁层再热镀锌，以解决其镀层超厚问题．电子探针显微分析(EPMA)结果表明：钢中的硅会在钢基表面富集；随着钢基/镀层界面向钢基方向移动，富硅的α-Fe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层向钢基方向生长并吞并附近的Γ层，令Γ层逐渐消失．含硅钢预电镀铁后延缓并减弱了硅对热镀锌合金相的影响，故能在一定浸锌时间内抑制活性钢热浸镀锌层的快速生长，抑制时间随预电镀铁层厚度的增加而增加．

关键词: 热镀锌, 活性钢, 电镀铁

Abstract:

Five kinds of steels respectively with the Si contents of 0.04% ,0.09% ,0.14% ,0.28% and 0.36% were electrodeposited with iron layer and were then galvanized in molten Zn.The corresponding formation and growth of the Fe-Zn interm etallic compound layer were investigated.The results show that the Fe-electrodeposited pretreatment can obviously restrain the quick growth of the galvanized coating of reactive steel,and that eligible coatings can be obtained when such reactive steels as Sandelin steel,thin hyper-Sandelin steel and Sandelin steel with a Si content about 0.28% are electroplated with an iron layer less than 10μm before being immersed in zinc bath.EPMA(Electron Prob Micro Analysis)results show that(1)excessive silicon in the steel accumulates on the surface of the steel substrate;and(2)with the movement of the steel/galvanized coating interface towards the steel substrate,the silicon-rich a-Fe peels of from the substrate and breaks into particles.The particles.much like the inert marker in Kirkendall effect experiment,enter the δ layer through the G layer,thus accelerating the growth of the δ layer towards the Γ layer till to a disappearance of the G layer.Moreover.the iron-electrodeposited pretreat.ment postpones and weakens the influence of silicon on the galvanized coating,so that the quick growth of the galvanized coating can be inhibited in a certain galvanizing time that increases with the thickness of the iron-electrode-posited layer.

Key words: hot-dipped galvanizing, reactive steel, Fe electr0dep0siti0n

车淳山卢锦堂许乔瑜孔纲睢润舟. 预电镀铁对活性钢热镀锌层的影响[J]. 华南理工大学学报（自然科学版）, 2006, 34(10): 62-66.

Che Chun-shan Lu Jin-tang Xu Qiao-yu Kong Gang Sui Run-zhou. Influence of Fe-Electr0deposited Pretreatment on Galvanized Coatings of Reactive Steels[J]. Journal of South China University of Technology (Natural Science Edition), 2006, 34(10): 62-66.