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
刘超 1代文贺 1王克俊 2陈增耀 2安雁军 1刘智勇3
作者信息
- 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
- 3. 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;北京科技大学新材料技术研究院 北京 100083
- 折叠
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l.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0.29mm/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.
Abstract
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 artifi-cial solution(i.e.10％NaCl(mass fraction)solution with pH 0.85)as a simulation of the corrosive environ-ment 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Key words
Cu/cargo tanker/corrosion/low alloy steel引用本文复制引用
出版年
2024
NETL
NSTL
万方数据