摘要
利用浸泡实验研究实验钢在超临界CO2环境下的腐蚀行为,讨论实验钢的腐蚀过程及机制。结果表明:实验钢微观组织由铁素体及铬的碳化物构成;腐蚀产物主要为Fe CO3晶体,试样表面腐蚀产物随腐蚀时间的延长逐渐累积,锈层结构趋于密实,该结构可有效阻止溶液中离子与基体反应,增加腐蚀抵抗性;腐蚀早期阶段,实验钢腐蚀减重量较小,随后迅速增加并出现平台,最终减重量缓慢增加;短时间浸泡后腐蚀速率较大,之后迅速下降,实验测定最终腐蚀速率为1.56 mm/a,真实腐蚀速率为0.078 mm/a。
Immersion experiments were conducted in order to investigate the corrosion behavior of carbon dioxide on pipelinesteels under supercitical CO2 conditions. The corrosion rates were measured,and the corrosion mechanisms were analyzedbased on the experimental results. The results demonstrate that the microstructure of the steel samples tested consists of ferriteand Cr-rich carbides,and the main corrosion products were Fe CO3 crystals. The corrosion products can accumulate onthe steel surface and become dense with prolonged corrosion time, which can effectively prevent mutual chemical reactions ofcorrosive ions in solution with the substrate steel and can increase the corrosion resistance significantly. The measured corrosionrate was very high after a short immersion time, and then it decreased rapidly. The final corrosion rate based on the experimentalresults was up to 1.56 mm / a ,and the actual corrosion rate was 0.078 mm/a.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第4期127-132,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家重点基础研究发展计划项目(2015AA03A501)
国家自然科学基金项目(51274063)
关键词
海洋软管
管线钢
超临界CO2
腐蚀行为
flexible pipes
pipeline steel
supercritical CO2
corrosion behavior
