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采用室内浸泡腐蚀试验研究了真空热处理对4145H钢抗H2S腐蚀性能的影响,并分析了其影响机理。利用SEM观察了真空热处理和常压热处理后的4145H钢的组织形貌,利用德国zahner电化学工作站,测试了4145H钢在H2S腐蚀环境中的极化曲线和电化学阻抗谱。结果表明,真空热处理及常压热处理后的组织均为回火托氏体。在H2S溶液中浸泡后的试样的腐蚀类型为局部腐蚀,主要为点蚀。真空热处理降低了试样的表面活性,使其腐蚀电流密度减小。4145H钢在H2S溶液中的阳极溶解动力学符合非催化机制,这是其耐H2S腐蚀性能提高的主要原因。
The effect of vacuum heat treatment on H2S corrosion resistance of 4145H steel was studied by indoor immersion corrosion test. The influence mechanism was also analyzed. The morphology of 4145H steel after vacuum heat treatment and atmospheric heat treatment was observed by SEM. The polarization curve and electrochemical impedance spectroscopy of 4145H steel in H2S corrosion environment were tested by German zahner electrochemical workstation. The results show that the microstructure after vacuum heat treatment and atmospheric heat treatment are all tempering. The corrosion type of the sample immersed in H2S solution is localized corrosion, mainly pitting corrosion. Vacuum heat treatment reduces the surface activity of the sample, reducing its corrosion current density. The anodic dissolution kinetics of 4145H steel in H2S solution is consistent with the non-catalytic mechanism, which is the main reason for its resistance to H2S corrosion.