论文部分内容阅读
为探讨货油舱下底板腐蚀环境中Mo对于耐蚀钢腐蚀行为的影响,采用自制的货油舱下底板环境模拟装置对不同Mo含量的两种耐蚀钢进行腐蚀试验,用失重法计算腐蚀速率,应用金相显微镜观察试验钢的组织类型和晶粒尺寸,应用扫描电镜(SEM)观察试验钢表面的微观腐蚀形貌。对模拟腐蚀环境中的试验钢进行电化学和阻抗谱(EIS)分析,应用EBSD分析晶界腐蚀与晶界类型的关系。结果表明:含有Mo元素的钢板表现出更好的耐腐蚀,点蚀现象不明显,均匀腐蚀速率可降低到0.3 mm/a;小角度晶界相比于大角度晶界表现出更好的耐晶界腐蚀性。
In order to investigate the effect of Mo on the corrosion behavior of corrosion-resistant steel in the bottom floor of cargo tank, a corrosion test was carried out on two kinds of corrosion-resistant steel with different Mo contents by using a homemade cargo tank under floor environmental simulation device. The microstructure and grain size of the test steel were observed by optical microscopy. The microscopic corrosion morphology of the test steel was observed by scanning electron microscopy (SEM). Electrochemical and impedance spectroscopy (EIS) analysis of the test steel in the simulated corrosion environment, EBSD analysis of the relationship between grain boundary corrosion and grain boundary types. The results show that the steel containing Mo element shows better corrosion resistance, the pitting corrosion phenomenon is not obvious and the uniform corrosion rate can be reduced to 0.3 mm / a; the small angle grain boundaries show better resistance than the high angle grain boundaries Corrosive grain boundaries.