Chen Zhi, Li Chao, Su Hang, Huang Yao, Yan Xianguo
School of Mechanical Engineering, Taiyuan Science and Technology University, Taiyuan 030024, China.
Materials (Basel). 2023 Jan 17;16(3):899. doi: 10.3390/ma16030899.
In this paper, the effect of deep cryogenic treatment on the corrosion resistance of 42CrMo low alloy steel is investigated and compared with conventional heat-treated counterparts. The low-temperature treatments of the cryogenic process are -120 °C, -160 °C, and -190 °C, respectively. Electrochemical corrosion tests show that the self-corrosion current density of -120 °C, -160 °C and -190 deep-cooled specimens is reduced by 38%, 20% and 30% respectively compared to the usual heat-treated specimens. Scanning electron microscope analysis shows that the precipitation of fine carbides on the surface of the samples treated at -120 °C has improved their corrosion resistance. Electrochemical impedance spectroscopy also shows that the samples treated with -120 °C cryogenic treatment have the smallest corrosion tendency. At a -160 °C deep-cooling process, the precipitated carbide aggregation limits the corrosion resistance of the material. The corrosion resistance of the samples in the -190 °C process group is between the two. The simulation results also express a similar trend to the electrochemical corrosion results.
本文研究了深冷处理对42CrMo低合金钢耐蚀性的影响，并与传统热处理的对应材料进行了比较。深冷处理过程中的低温处理温度分别为-120℃、-160℃和-190℃。电化学腐蚀试验表明，与常规热处理试样相比，-120℃、-160℃和-190℃深冷处理试样的自腐蚀电流密度分别降低了38%、20%和30%。扫描电子显微镜分析表明，-120℃处理的样品表面析出的细小碳化物提高了其耐蚀性。电化学阻抗谱也表明，-120℃深冷处理的样品腐蚀倾向最小。在-160℃深冷过程中，析出的碳化物聚集限制了材料的耐蚀性。-190℃处理组样品的耐蚀性介于两者之间。模拟结果也呈现出与电化学腐蚀结果相似的趋势。
