研究了四种含硅钢板预镀镍后热浸锌时镀层的生长动力学,以及镀层中合金相的形成和生长规律,探讨了预镀镍对活性钢热浸锌镀层生长的抑制机理.实验结果表明:预镀镍法可以显著降低活性钢镀锌层的快速生长,获得厚度适宜、表面光亮,粘附性好的镀层.预镀镍钢板热浸锌时首先形成一系列的Ni-Zn合金γ',γ和δ2相,随着进一步的扩散和反应,γ',γ和δ2相逐渐消失,生成了Fe-Zn-Ni三元金属间化合物Г2和Fe-Zn金属间化合物Г和δ;随后Г2相消失,在δ相和液相Zn间生成块状的ζ晶粒,并逐渐变成稳定致密的连续ζ层.钢板预镀镍后热镀锌时完全改变了Fe-Zn相的生长顺序,明显延缓了ζ相的生长,显著抑制了活性钢热浸镀锌层的异常生长.
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