Cu含量对Q420钢在货油舱内底板环境下腐蚀行为的影响  

Effect of Cu Content on Corrosion Behavior of Q420 Steel in an Artificial Solution of Bottom Plate Environment of Cargo Oil Tanks

作　　者：刘超 代文贺 王克俊 陈增耀 安雁军 刘智勇 LIU Chao;DAI Wenhe;WANG Kejun;CHEN Zengyao;AN Yanjun;LIU Zhiyong(Key Laboratory of Safety Evaluation of Steel Pipes and Fittings for State Market Regulation,Hebei Special Equipment Supervision and Inspection Institute,Shijiazhuang 050061,China;Institute of Advanced Materials&Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]河北省特种设备监督检验研究院、国家市场监管重点实验室(钢制管子及管件安全评),石家庄050061 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《中国腐蚀与防护学报》2024年第4期927-938,共12页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(52071017)。

摘　　要：对Q420钢进行适当的Cu合金化功能性改进,制备出不同Cu含量(质量分数分别为0.5%、1.0%、1.5%和2.0%)的新型低合金实验钢。利用浸泡实验、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、透射电子显微镜(TEM)等方法对含Cu低合金钢在货油舱内底板点蚀坑内环境(pH 0.85的10%(质量分数)NaCl溶液)中的腐蚀规律与机理进行了研究。结果表明,以铁素体+珠光体为组织特征的1.0Cu低合金钢能够保证在Q420钢强度的水平下具有优异的耐腐蚀性能。随着浸泡时间的延长,5种不同Cu含量钢的腐蚀速率整体呈下降趋势。Cu含量为1%时,腐蚀速率降到0.29 mm/a,与Q420基准钢相比降低了43%。实验证明Cu的添加对Q420钢在货油舱内底板环境下的均匀腐蚀性具有积极的作用。Trial low alloy steels based on Q420 steel were prepared by alloying with a little amount of Cu 0.5%,1.0%,1.5%and 2.0%,mass fraction.Then their corrosion behavior was assessed in an artificial solution(i.e.10%NaCl(mass fraction)solution with pH 0.85)as a simulation of the corrosive environment of the bottom plate of cargo oil tanks were studied by means of immersion tests,SEM,XRD,TEM,and other methods.The results indicate that the low alloy steel with 1.0%Cu of a microstructure of ferrite and pearlite can ensure excellent corrosion resistance at the strength level of Q420 steel.The addition of Cu plays a crucial role in the corrosion resistance of the low alloy steel.As the soaking time prolongs,the corrosion rate of the trial steels with 5 different Cu-content shows an overall downward trend.The trial low alloy steel with 1%Cu presents a corrosion rate of 0.29 mm/a,which is 43%lower than the Q420 benchmark steel.The study proves that the addition of Cu has a positive effect on the uniform corrosion of Q420 in the simulated bottom plate environment of cargo oil tanks.

关 键 词：CU 货油轮 腐蚀 低合金钢 

分 类 号：TG174.2[金属学及工艺—金属表面处理]