根据对Zn-Fe-Si三元体系的热力学评估计算和实验研究,体系中Si的化学位随Zn含量的增加而迅速提高.通过高温镀锌实验分析了diffuse-△(δ相+锌液)区域形成的原因,阐述了热浸镀锌中硅反应性的机理.镀层中的Si有向Fe含量高的相(特别是δ/ζ相界附近的δ相)、δ/ζ相界及ζ相晶界富集的趋势.随时间推移,扩散通道向富Si端移动,切过ζ相与液相两相平衡的共轭线,导致ζ相晶界附近出现的液体容纳Si,形成液体通道,液相穿过ζ相并与外面的锌液连接.液体直接与δ相接触,导致微应力的出现,液体可以沿着微裂纹腐蚀δ相,形成破碎的diffuse-△区域,锌液直接侵蚀基体.镀层生长受界面反应控制,镀层的线性生长导致形成较厚的镀层.
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