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采用稀土催渗剂(LaCl3)对38CrMoAlA钢进行真空氮化处理。对其渗氮层组织进行了金相观察及显微硬度测试,采用极化曲线对氮化前后试样的腐蚀行为进行了分析研究,同时利用盐雾腐蚀试验对真空氮化处理前后的试样进行加速腐蚀,用腐蚀增重对比分析实验组与对照组试样在盐雾环境中的腐蚀情况。结果表明:催渗剂(LaCl3)为0.15 g的真空渗氮试样,白亮层致密性较好,渗层深度达0.33 mm,具有最高的硬度值950 HV及平缓的硬度梯度,腐蚀速率最小,耐蚀性能最佳。
38CrMoAlA steel was vacuum nitrided with rare earth kaolinite (LaCl3). The microstructure and nitriding microstructure of the nitrided layer were investigated. The corrosion behavior of the samples before and after nitriding was analyzed by using the polarization curve. At the same time, the samples before and after vacuum nitriding Accelerated corrosion was compared with corrosion weight gain of the experimental group and control group samples in the salt spray environment corrosion. The results show that the LaN3 sample is a vacuum nitriding sample of 0.15 g. The compactness of the white bright layer is good with the depth of 0.33 mm. It has the highest hardness value of 950 HV and the gentle hardness gradient with the smallest corrosion rate. Corrosion resistance best.