研究了含0.38%Si(质量分数)的Q345钢预镀镍后热镀锌时镀层的生长和组织形成.结果表明:预镀一薄层镍可有效抑制含Si＞0.3%的低合金高强度结构钢热镀锌时生成超厚、表面灰暗的锌层,镍层越厚,锌层生长越慢.在浸锌时,镀镍层先与Zn反应生成Ni-Zn合金相γ′和γ,镍层消耗完后,出现Fe-Zn合金相δ和Ni-Zn合金相δ2,最后Ni-Zn相消失,镀层为连续的δ相和分散在η相中的块状ζ相;Ni-Zn相形成连续致密的层状组织是抑制锌层快速生长的主要原因.
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