摘要
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 effects of vacuum heat treatment on H：S corrosion performence of AISI 4145H steel and microstructure were investigated using immersed corrosion and SEM, respectively. Polarization curves and EIS were also studied with the use of the zahner electrochemical workstation. The results show that the microstructures of the two kinds of heat-treatment process is both tempered sorbite. With the H2S solution, the 4145H steel tends to exhibit localized attack, mainly pitting. The surface activity of 4145H steel reduces by vacuum heat-treatment, so the corrosion current density goes down. Anodic dissolution dynamics in H2S solution of AIS14145H conforms the non-catalytic mechanism, which is the main reason for the improvement of the corrosion resistance of H2S.
出处
《热加工工艺》
CSCD
北大核心
2013年第2期148-150,153,共4页
Hot Working Technology
基金
内蒙古自然科学基金资助项目(2010MS0802)
