(華南理工大學(xué)材料科學(xué)研究所，廣州510641)
摘 要: 利用SEM和EPMA研究了含0.22%Si鋼板在含鎳0.3%以下的幾種鋅浴中獲得的鍍層組織。研究結(jié)果表明:當(dāng)鋅浴含鎳大于0.07%時(shí)，ζ相層變薄而晶粒細(xì)化，ζ相柱狀晶的晶間和ζ相前沿的η相中出現(xiàn)鎳富集；當(dāng)鋅浴中鎳含量≥0.2%，在η相中析出Zn-Fe-Ni金屬間化合物T2相的晶粒。文中還根據(jù)Zn-Fe-Ni三元相圖，探討了鋅浴加鎳后鍍層組織變化的原因。
關(guān)鍵字: 熱浸鋅鎳合金鍍層 熱鍍鋅 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
