焊管2026，Vol.49Issue(8)：52-63,12.DOI:10.19291/j.cnki.1001-3938.2026.08.006
CO2和Cl-耦合作用下P110钢气液界面腐蚀产物膜及膜下腐蚀行为
Corrosion Product Films and Under-film Corrosion Behavior at Gas-liquid Interface of P110 Steel under CO2 and Cl-Coupling Effects
摘要
Abstract
To investigate gas-liquid interface corrosion behavior of P110 steel in humid CO2 and Cl-environment,a semi-immersion corrosion test was conducted to simulate a localized service environment in which gas phase,gas-liquid interface,and liquid phase coexist.Combined with potentiodynamic polarization curves,electrochemical impedance spectroscopy,SEM,EDS,and cross-sectional morphology analysis,effects of NaCl concentration under Ar and CO2 atmospheres on corrosion product film and under-film corrosion behavior of P110 steel were examined.Results show that in NaCl solution saturated with CO2,as the NaCl concentration increased from 50 g/L to 150 g/L,the corrosion current density of P110 steel increased from 9.252×10-5 A/cm2 to 1.407×10-4 A/cm2,and corrosion rate increased from 1.076 mm/a to 1.636 mm/a.This indicates that an increase in Cl-concentration promotes the electrochemical corrosion process of P110 steel.After 10 days semi-immersion corrosion,the surface corrosion morphology of the sample exhibited distinct differences along the height direction,with the most severe corrosion occurring in the gas-liquid interface region.Under the Ar atmosphere,only a small amount of corrosion products formed,mainly appearing as scattered granular deposits.In contrast,under the CO2 atmosphere,a large number of crystalline corrosion products FeCO3 were formed on the steel surface.With increasing NaCl concentration,the corrosion product particles formed under the CO2 atmosphere became finer and accumulated unevenly.The continuity of the product film and the adhesion between the film and the substrate decreased.Cross-sectional observations revealed loose corrosion products and under-film corrosion defects.The gas-liquid interface corrosion of P110 steel in the NaCl solution saturated with CO2 semi-immersion system is mainly controlled by the combined effects of CO2 induced acidification,charge transfer accelerated by Cl-and localized degradation of the corrosion product film.关键词
P110钢/气液界面腐蚀/CO2腐蚀/NaCl/腐蚀产物膜/电化学阻抗Key words
P110 steel/gas-liquid interface corrosion/CO2 corrosion/NaCl/corrosion product film/electrochemical impedance spectroscopy分类
矿业与冶金引用本文复制引用
张慧慧,王晋泽,杨桐,席海璐..CO2和Cl-耦合作用下P110钢气液界面腐蚀产物膜及膜下腐蚀行为[J].焊管,2026,49(8):52-63,12.基金项目
陕西省自然科学基础研究计划资助项目面上项目"纳米材料改性对橡胶密封件在超临界CO2环境中抗溶胀性和机械性能的提升机制"(项目编号2025JC-YBMS-611). （项目编号2025JC-YBMS-611）
