【摘要】 本文研究了在Ｚｎ－０．１％Ｎｉ合金锭液中形成的渣的成分、相结构、形成机制以及影响成渣的两个因素．结果表明，这种渣是由单斜晶系的Ｆｅ（Ｎｉ）－Ｚｎ１３ζ合金相和纯Ｚｎ的η基体相组成的混合物，其形成机制与纯Ｚｎ镀液中渣的形成机制基本相同，即工件及钢质锌锅与镀液反应形成二元系（Ｆｅ－Ｚｎ）相（ζ相），部分剥落进入镀液中，并且其中的Ｆｅ原子被Ｎｉ原子部分取代之后形成三元系的Ｆｅ－Ｎｉ－Ｚｎ合金渣．结果还表明，向Ｚｎ－Ｎｉ合金镀液中加入少于０．２％Ａｌ及低温镀锌均有利于减少渣的形成．更多还原

【Abstract】 The present study is concerned with the composition, microstructure and formation mechanism of the dross formed in a Zn-0.1% Ni alloy bath for hot-dipping Zn-Ni on steel substrates, as well as with the factors affecting the dross formation.It is found that the dross is an aggregate consisting of pure Zinc(η-phase) as the matrix and a lump -like trinary ζ-Fe(Ni) -Zn13 phase (the "alloy phase") produced during the hot-dipping. The trinary ζ-phase in the alloy bath is believed to be formed by a mechanism essentially similar to that prevailing in the pure-zinc bath, i. e. a binary ζ- (Zn-Fe) phase is first formed on the steel substrate by the reaction between Zn and Fe, which then flakes off the substrate and enters the bath. The-Fe atoms in the binary ζ-phase is then partly substituted by the Ni atoms already dissolved in the bath from the Zn-2%Ni intermediate alloy used to make up the bath, thus forming the trinary ζ-phase. This study therefore rejects the former conclusion that the lump-like constituent present in the dross is the -(Zn-11%Ni) phase formed by the direct deposition of the intermediate alloy onto the bath bottom. Adding a small amount (<0.2%) of Al into the bath and employing a relatively low dipping temperature of about 455℃ can retard the dross formation.更多还原