焊管2025，Vol.48Issue(6)：44-50,7.DOI:10.19291/j.cnki.1001-3938.2025.06.006
CO2分压对5Cr合金钢腐蚀行为影响研究
Research on Corrosion Behavior Influence of 5Cr Steel under CO2 Partial Pressures
摘要
Abstract
To investigate the corrosion characteristics of 5Cr steel in CO2 flooding environments of oil and gas fields,high temperature and high pressure reactor simulation tests as well as electrochemical testing methods were conducted.By utilizing the weight loss method,potentiodynamic polarization curve techniques,and multi-scale characterization techniques such as SEM-EDS,the influence mechanism of CO2 partial pressure on its corrosion kinetics and passive film characteristics was systematically studied.The results indicate that under varying partial pressures of CO2,the uniform corrosion rate of 5Cr alloy steel remains relatively low.As the partial pressure of CO2 increases,microcracks form in the corrosion product film of low Cr alloy steel,and the corrosive medium directly contacts the substrate,intensifying the corrosion.The self-corrosion potential shifts negatively,and the corrosion current density correspondingly increases.Analysis of the corrosion product morphology reveals that the corrosion product film consists of two layers:the inner layer is primarily composed of Cr(OH)3,while the outer layer mainly contains FeCO3.The electrochemical polarization curves demonstrate that the anodic polarization curve of low-Cr alloy steel in a CO2 corrosion environment exhibits pseudo-passivation behavior.The passivation film formed on the material surface can effectively mitigates the CO2-induced corrosion of 5Cr steel.关键词
5Cr合金钢/CO2腐蚀/腐蚀产物膜/电化学Key words
5Cr alloy steel/CO2 corrosion/corrosion product film/electrochemistry分类
能源科技引用本文复制引用
左宏志,齐亚猛..CO2分压对5Cr合金钢腐蚀行为影响研究[J].焊管,2025,48(6):44-50,7.基金项目
国家重点研发计划"高强韧耐蚀钛合金油套管工业化制造成套技术研发"(项目编号2021YFB3700802). （项目编号2021YFB3700802）
