采用控制变量法研究了镀锌30CrMnSi在不同保温温度和时间条件下的界面演化行为,并结合扫描电子显微镜和电子探针等技术手段,对界面显微组织演化规律与元素扩散行为特征进行分析.结果表明:锌铁扩散层中金属间化合物生成顺序依次为ξ相、δ相、Γ相;当保温温度在300℃以上时,扩散层中金属间化合物生长主要由扩散速率控制,层厚呈抛物线增长;保温温度在300℃以下时,锌扩散速率较低,金属间化合物生长主要由界面反应控制,层厚呈近线性增长,计算获得锌铁反应激活能为162.37 kJ/mol.建立镀锌30CrMnSi锌铁扩散层的生长动力学模型,通过此模型可对实验温度下锌铁扩散层厚度进行初步计算.
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