38CrMoAlA钢稀土催渗真空氮化膜的耐蚀性能研究

Investigation on Corrosion Performance of Rare Earth Catalyst of Vacuum Nitriding Film on 38CrMoAlA Steel

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。

Adopting RE energizer （LaCl3） to vacuum nitriding process of 38CrMoAIA steel, the nitrided layer of tissue was observed by metallography and the micro-hardness was measured. The corrosion behavior was studied by the polarization curve. The original sample and the processed sample tested under the conditions of salt spray were investigated. The corrosion rates of the experimental group and the control group in salt fog environment were examined with the method of corrosion mass increase. The results show that for the vacuum nitriding sample of 0.15 g energizer （LaC13）, its white layer has the preferably compact; the case depth of 38CrMoA1A steel is 0.33 ram; the microhardness is 950 I-IV which is the maximum, gentle hardness gradient, the corrosion rate of the smallest, and the best corrosion resisting property.