Mo对货油舱下底板用E36级船板钢耐腐蚀性能的影响  

Effects of Mo on Corrosion Performance of E36 Steel for COT Bottom Plate

作　　者：刘晓童 武会宾[1] 刘星海[2] 梁金明[1] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《热加工工艺》2014年第2期1-4,共4页Hot Working Technology

基　　金：国家科技支撑计划资助项目(2011BAE25B00)

摘　　要：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。The corrosion behaviors of corrosion resistant steel with different Mo content were studied by homemade cargo oil tank corrosion simulation device which contains the strong acid Cl^- solution corrosion on the bottom plate. The average corrosion rate of the test steels was measured by mass loss method. The metallography was used to analyze the microstructure and grain size. The scanning electron microscope （SEM） was used to observe the morphology of the surface of the test steels after soaking for 3 d. The electrochemical polarization curve and impedance spectroscopy analysis （EIS） were employed to study the corrosion behavior of the test steels. The relationship between grain boundary corrosion and grain boundary energy was investigated by EBSD. The results show that Mo adding increases the consistency of general corrosion, and the average corrosion rate of the ship plate is down to 0.3 mm/a. Pitting corrosion phenomenon is improved by adding Mo. The proportion of low energy grain in test steel with Mo is higher than that without Mo. The corrosion resistance of grain boundary increases with the increase of the proportion of low energy grain boundaries.

关 键 词：强酸性Cl^- 腐蚀 Mo元素 晶界 

分 类 号：TG142.71[一般工业技术—材料科学与工程]