热浸Zn-Al-Mg和Zn-Al-Mg-Si合金镀层的组织与耐腐蚀性  

Microstructure and corrosion resistance of hot dip Zn-Al-Mg and Zn-Al-Mg-Si alloy coatings

作　　者：刘继拓[1] 贺志荣[1] 吴佩泽[1] 解亚丹 戚云昊 

机构地区：[1]陕西理工学院材料科学与工程学院,陕西汉中723000

出　　处：《陕西理工学院学报（自然科学版）》2015年第3期1-7,共7页Journal of Shananxi University of Technology:Natural Science Edition

基　　金：陕西省科技统筹创新工程计划项目(2011KTDZ01-03-06);陕西省大学生创新创业训练计划项目(1626);陕西理工学院研究生创新基金资助项目(SLGYCX1432)

摘　　要：对比研究热浸镀Zn-0.5Al-1.5Mg、Zn-2Al-1.5Mg和Zn-2Al-1.5Mg-0.3Si合金镀层组织与耐腐蚀性。用X射线衍射仪、扫描电子显微镜及能谱仪分析了合金镀层的组成相和显微组织,用全浸腐蚀试验和中性盐雾试验表征了合金镀层的耐腐蚀性能。结果表明:Zn-Al-Mg和Zn-Al-Mg-Si合金镀层主要由Zn相、Al相和Mg Zn2相组成;合金镀层主要含有Zn+Mg Zn2二元共晶组织和Zn+Al+Mg Zn2三元共晶组织;Al和Si有细化镀层晶粒作用,添加Si能提高Zn-Al-Mg-Si合金镀层的耐腐蚀性能。The microstructure and the corrosion resistance of hot dip Zn-0.5Al-1.5Mg,Zn-2Al-1.5Mg and Zn-2Al-1.5Mg-0.3Si alloy coatings were comparatively investigated.The composition phases and the microstructures of coatings were analyzed by X-ray diffractometer,scanning electron microscope and energy dispersive spectrometer.The corrosion resistance of coatings was characterized by full immersion corrosion and neutral salt spray test.The results indicate that the Zn-Al-Mg and Zn-Al-Mg-Si alloy coatings are mainly composed of Zn phase,Al phase and MgZn2 phase, the Zn＋MgZn2 eutectic and Zn＋Al＋MgZn2 eutectic were found in alloy coatings, the element of Al and Si can refine the grain size, adding Si in the Zn-Al-Mg alloy bath can enhance alloy coatings’ resistance to corrosion.

关 键 词：Zn-Al-Mg合金 Zn-Al-Mg-Si合金 镀层组织 耐腐蚀性能 

分 类 号：TG174.443[金属学及工艺—金属表面处理]