含Cr低合金钢货油舱上甲板环境腐蚀行为  

Environment corrosion behavior of cargo oil tank deck made of Cr-contained low-alloy steel

作　　者：梁金明[1] 唐荻[1] 武会宾[1] 王立东[1] 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《东南大学学报（自然科学版）》2013年第1期152-157,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家科技重大专项资助项目(2011ZX05016-004);"十二五"国家科技支撑计划资助项目(2011BAE25B00)

摘　　要：为了研制货油舱上甲板用低合金耐蚀钢和了解该环境下的腐蚀机理,采用自制的O2-CO2-SO2-H2S湿气腐蚀模拟装置,对不同Cr含量的低合金钢进行腐蚀行为研究.在进行腐蚀试验后,首先测量了腐蚀速率,然后应用SEM对腐蚀产物膜的微观形貌及结构进行分析,并通过EDS和XRD确定腐蚀产物膜的物相组成,采用EBSD手段分析大小角度晶界对腐蚀性能的影响.结果表明:模拟湿气腐蚀的腐蚀产物膜主要由α-FeOOH,γ-FeOOH,S,FeS2,Fe1-xS,FeS组成,且呈分层结构;3%Cr较1%Cr腐蚀速率显著下降;Cr含量上升到3%时,腐蚀产物膜内层出现明显的Cr富集;3%Cr较1%Cr含量实验钢的大角度晶界比例下降.Cr含量在一定范围内的提高有助于低合金钢表现出较好的耐蚀性能.In order to develop a low-alloy anti-corrosion steel for the deck of cargo oil tank and understand the corrosion mechanism, the corrosion behavior of low-alloy steels containing different levels of Cr in a moisture gas of O2-CO2-SO2-H2 S were investigated using cargo oil tank corrosion simulation device. After the corrosion test, corrosion rate was measured firstly, then the morphology of corrosion product films was observed by SEM （scanning electron microscope）. The phase composi- tion and structure of corrosion product film were analyzed by EDS （ energy dispersive spectroscopy） and XRD（X-ray diffraction）. EBSD （electron backscattered diffraction） was used to analyze the effect of the size of grain boundary angle on corrosion property. The results show that moisture corrosion product film of cargo oil tanks on the upper deck is composed of α-FeOOH, γ-FeOOH, element S, FeS2, Fe1-xS and FeS, displaying a multi-layered structure. Compared with 1% Cr steel, the corrosion rate of 3 % Cr steel decreases significantly. When the Cr content reaches 3%, Cr enrichment forms in the inner layer of corrosion product film. In addition, the proportion of large angle grain boundary in 3 % Cr steel is lower. With the increase of Cr content in a certain range, low-alloy steel may show good corrosion resistance.

关 键 词：CR含量 货油舱 腐蚀产物膜 大角度晶界 

分 类 号：TG172.3[金属学及工艺—金属表面处理]