热浸Zn－Ni合金镀液中锌渣的研究

STUDY OF DROSS FORMATION IN HOT-DIP Zn-0.1% Ni ALLOY BATH

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．

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 essen...