(华南理工大学材料科学研究所，广州510641)
摘 要: 利用SEM和EPMA研究了含0.22%Si钢板在含镍0.3%以下的几种锌浴中获得的镀层组织。研究结果表明:当锌浴含镍大于0.07%时，ζ相层变薄而晶粒细化，ζ相柱状晶的晶间和ζ相前沿的η相中出现镍富集；当锌浴中镍含量≥0.2%，在η相中析出Zn-Fe-Ni金属间化合物T2相的晶粒。文中还根据Zn-Fe-Ni三元相图，探讨了锌浴加镍后镀层组织变化的原因。
关键字: 热浸锌镍合金镀层 热镀锌 Zn-Fe-Ni化合物
MICROSTRUCTURE OF HOT DIP GALVANIZED COATING
（Institute of Materials Science,
South China University of Technology, Guangzhou, 510641）
Abstract:The microstructure of hot dip galvanized coatings of the steel sheet containing 0.22%Si by dipping in several zinc baths containing 0~0.3%Ni was studied by using SEM and EPMA. The result showed that, adding 0.07~0.12%Ni into the zinc bath, theζlayer is thinned and theζcrystal is fined, Ni is rich in the boundary of the columnar crystal ofζlayer and in theηphase in front of theζlayer. Adding equal to or greater than 0.20%Ni into the zinc bath,some particles of Zn-Ni-Fe intermetallic compound are precipitated in theηlayer. The reason that the coating microstructure is changed after adding Ni into the zinc bath is also discussed according to Zn-Ni-Fe ternary diagram.
Key words: hot dip Zn-Ni alloy coating hot dip galvanizing Zn-Ni-Fe compound
