Ni含量对热浸Zn-Al-Ni合金镀层组织和耐腐蚀性能的影响  

Effect of Ni Content on Microstructure and Corrosion Resistance of Hot-dip Zn-Al-Ni Alloy Coating

作　　者：邵大伟[1] 贺志荣[1] 张永宏[1] 

机构地区：[1]陕西理工学院材料科学与工程学院,汉中723003

出　　处：《表面技术》2013年第2期18-19,43,共3页Surface Technology

基　　金：陕西省科技统筹创新工程计划项目(2011KTDZ01-03-06);汉中锌业有限责任公司科研基金项目(HZXY2011003)

摘　　要：为了提高热浸镀锌层的耐腐蚀性能,向Zn-0.01%Al镀浴中添加少量Ni,在Q235钢表面获得Zn-Al-Ni热浸镀锌合金层,并用光学显微镜观察了镀层的组织,通过全浸腐蚀实验表征了镀层的耐腐蚀性能。结果表明:随着镀浴中Ni含量的增加,Zn-Al-Ni镀层的腐蚀速率先减小,后增大,当Ni含量为0.05%时,镀层的耐腐蚀性能最好;可以通过降低ζ相层的厚度以及增大δ相层的厚度,来提高镀层的耐腐蚀性能。In order to improve the corrosion resistance of hot-dip galvanizing coating, the hot-dip galvanizing alloy of Zn-A1-Ni were gained on the surface of Q235 steel by adding a small amount of Ni in the Zn-0.01% A1 bath. The microstructures of coatings were observed by the optical microscopy, and the corrosion resistance of coatings was characterized by full immersion corrosion test. The results show that the corrosion rate decreases firstly and then increases along with the increase of Ni content in the alloy bath. The corrosion resistance is the best for the coating when the Ni content is 0.05%. The corrosion resistance can be enhanced by reducing the thickness of ζ phase and increasing the thickness of δ phase.

关 键 词：Zn-Al-Ni合金 热镀锌 显微组织 耐蚀性能 

分 类 号：TQ153.2[化学工程—电化学工业]