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采用控制变量法研究了镀锌30Cr Mn Si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ζ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 k J/mol。建立镀锌30Cr Mn Si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。
The interfacial evolution of galvanized 30Cr Mn Si under different holding temperature and time was investigated by the control variable method. The microstructure evolution and element diffusion behavior of the interface were investigated by SEM, E-probe and other techniques. analysis. The results show that the order of formation of intermetallic compounds in Zn-Zn diffusion layer is ζ phase, δ phase and Γ phase. When the temperature is above 300 ℃, the intermetallic compound growth in diffusion layer is mainly controlled by the diffusion rate and the layer thickness is parabolic . The diffusion rate of zinc was lower when the temperature was below 300 ℃. The growth of intermetallic compounds was mainly controlled by interfacial reaction and the layer thickness was nearly linear. The calculated activation energy of ferrous reaction was 162.37 kJ / mol. The growth kinetics model of zinc-manganese-zinc-manganese diffusion layer was established. Through the model, the thickness of zinc-iron diffusion layer at the experimental temperature can be preliminarily calculated.