热浸镀锌铝镁钢板镀层组织及腐蚀性能研究

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材料工程 ›› 2012, Vol. 0 ›› Issue (10) : 89-93.

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热浸镀锌铝镁钢板镀层组织及腐蚀性能研究

吕家舜^1,2, 李锋², 杨洪刚², 康永林¹

作者信息 +

Research on Coating Microstructure and Corrosion Behavior of Galvanized Zn-Al-Mg Coated Steel Sheet

LU Jia-shun^1,2, LI Feng², YANG Hong-gang², KANG Yong-lin¹

Author information +

文章历史 +

摘要

锌铝镁镀层钢板比普通的镀锌钢板具有更加优异的耐腐蚀性能,本研究利用热镀锌模拟器在实验室制备了热浸镀锌铝镁合金镀层钢板,利用扫描电子显微镜SEM观察了镀层表面及截面的微观组织,利用能谱EDS进行了微区成分分析;利用电子探针EPMA对镀层的表面及截面进行了元素分布分析,利用盐雾试验方法对锌铝镁镀层钢板的耐腐蚀性能进行了研究,利用X射线衍射分析了镀层及镀层盐雾试验腐蚀产物的物相组成。结果表明,热浸镀锌铝镁镀层钢板比普通镀锌板具有更加细致的组织,镀层主要由MgZn₂与含Al富锌相构成的共晶相和MgZn₂组成,另外还存在一些粒状富铝相和块状富锌相,Zn-Al-Mg镀层比普通镀锌板具有更强的耐腐蚀性能,最后分析了锌铝镁镀层钢板的耐盐雾腐蚀机理。

Abstract

Galvanized Zn-Al-Mg coated steel sheet offer higher corrosion resistance than conventionally galvanized steel because aluminum magnesium has a positive effect on the corrosion resistance of steel coating. In this research, Galvanized Zn-Al-Mg coated steel sheet was prepared in laboratory by hot dip simulator. By SEM and EDS, the surface and cross section microstructure Zn-Al-Mg coating was analyzed. The distribution of elements in coating includes Zn, Al, Mg and Fe was observed by EPMA. The anti-corrosion capability of Zn-Al-Mg coating was studied by salt spray test. Coating itself and the erode production was inspect by X-ray diffraction. It was proved that the Zn-Al-Mg coating has finer microstructure, and has even more excellent corrosion resistance. The protection mechanism of Zn-Al-Mg coating steel sheet in salt spray test was analyzed.

导出引用

吕家舜, 李锋, 杨洪刚, 康永林. 热浸镀锌铝镁钢板镀层组织及腐蚀性能研究[J]. 材料工程, 2012, 0(10): 89-93

LU Jia-shun, LI Feng, YANG Hong-gang, KANG Yong-lin. Research on Coating Microstructure and Corrosion Behavior of Galvanized Zn-Al-Mg Coated Steel Sheet[J]. Journal of Materials Engineering, 2012, 0(10): 89-93

中图分类号： TG174.433

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