焊管2026，Vol.49Issue(8)：13-21,32,10.DOI:10.19291/j.cnki.1001-3938.2026.08.002
X80钢在典型土壤环境中的腐蚀及SCC行为机理研究
Mechanistic Study on Corrosion and SCC Behavior of X80 Steel in Typical Soil Environments
摘要
Abstract
To address issues such as leakage and failure caused by corrosion in buried pipelines,the corrosion behavior of X80 steel in two typical environments:acidic soil in southern China(Yingtian)and highly saline-alkali soil in northwestern China(Hamit)is systematically investigated.Methods included uniform corrosion tests,electrochemical tests,slow strain rate tensile(SSRT)tests,and microscopic characterization of corrosion features.The results indicate that X80 steel presents consistent uniform corrosion behavior in the two simulated solutions under stress-free conditions,with a corrosion mode dominated by uniform corrosion accompanied by pitting corrosion.The corrosion rates in the two solutions are at similar levels,and both decay following a negative exponential power function with the extension of immersion time.Under stressed conditions,X80 steel exhibits generally low SCC susceptibility under different influencing factors in the two soil environments.Cathodic potential exerts a similar effect on the SCC behavior of X80 steel in both solutions.The SCC susceptibility increases slightly when the potential changes from the open circuit potential(OCP)to-850 mV,and rises sharply as the potential decreases from-850 mV to-1 200 mV.Overall,the SCC susceptibility of X80 steel in the Hami soil simulated solution is higher than that in the Yingtan soil simulated solution.Comprehensive analysis shows that the conventional cathodic protection potential can realize dual protection against uniform corrosion and stress corrosion cracking for X80 steel.关键词
X80钢/土壤腐蚀/均匀腐蚀/应力腐蚀开裂/腐蚀机理Key words
X80 steel/soil corrosion/uniform corrosion/stress corrosion cracking/corrosion mechanism分类
矿业与冶金引用本文复制引用
闫立震,张丽丽,代文贺,刘智勇..X80钢在典型土壤环境中的腐蚀及SCC行为机理研究[J].焊管,2026,49(8):13-21,32,10.基金项目
国家市场监督管理总局科技计划项目"高强钢制管道应力腐蚀开裂在线评价方法与测试装置研究"(项目编号2024MK011). （项目编号2024MK011）
