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中文摘要：
研究了高硅钢（0.49%Si,质量分数）在不同浸镀温度（440,480,520,560,600℃）和不同浸镀时间（1,3,5,10min）下的热镀锌试样镀层组织,探讨了浸镀温度和浸锌时间对镀层组织的影响。SEM/EDS结果表明：440℃和480℃热镀锌,镀层由薄而连续δ层和破碎的块状ζ相组成,无Γ相。ζ相生长过快,镀层过厚、灰暗、黏附性差,镀层生长主要由界面反应机制控制;520℃热镀锌时,镀层由极薄的Γ层、致密δk层和疏松的δp层组成,镀层生长主要受扩散机制控制;560℃和600℃镀锌时,镀层为Γ层和致密的δ相层,部分δ粒子弥散分布在η层中,镀层生长为扩散机制控制并伴随有显著的δ溶解过程。最佳高温镀锌温度应在520~560℃。
英文摘要：
The hot dip galvanized samples of high silicon reactive steel（0.49%Si,mass fraction） were prepared by immersed in molten zinc bath at different temperatures（440,480,520,560,600℃） for different time（1,3,5,10min）.The effects of zinc bath temperature and immersion time on the galvanized coatings were discussed.SEM/EDS results show that at 440℃ and 480℃,the coating is composed of thin δ layer and lumpy ζ phase.No Γ phase is found.The excessive growth of ζ produces an undesirable coating with excessive thickness,gray appearance and bad adhesion.The growth rate of coating obeys by interfacial reaction mechanism.At 520℃,the coating is composed of extremely thin Γ layer,compact δk layer and loose δp layer.The growth rate of coating is controlled by diffusion mechanism.At 560,600℃,the coating is a Γ layer and a compact δ layer.Some δ particles are dispersed in η layer.The growth rate of coating is controlled by diffusion mechanism,accompanying the dissolve of δ from coating into molten zinc bath.The optimized operating temperature for high temperature galvanizing should be controlled in the range of 520-560℃.
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