摘要
采用热处理炉对X80管线钢进行200℃回火30min,通过动电位极化,电化学阻抗谱等技术研究了回火前后X80钢在NaHCO3溶液中的腐蚀电化学行为。结果表明,回火前后X80在NaHCO3溶液中的腐蚀都是阴极控制腐蚀类型,但低温回火后X80钢的自腐蚀电位从回火前的-0.739V降低为-0.877V(SCE),并且维钝电流也从回火前的5.48μA.cm-2升高到17.82μA.cm-2;电化学阻抗谱测试表明,低温回火后的钝化膜比回火前X80钢钝化膜疏松,这与金相显微镜观察结果相吻合。
X80 pipeline steel was tempered for 30min at 200 ℃ with a heat treatment furnace, and then the electrochemical behavior of X80 steel before and after tempering in the solution of NaHCO3 was studied by the method of potentiodynamic polarization , electrochemical impedance spectroscopy and so on. The results showed that the corrosion was the type of cathodiz control. The corrosion potential of the X80 steel was reduced from --0.75 V before tempering to --0. 80 V （SCE） after ternpereing, and the passive current increased from 5.48μA·cm-2before tempering to 17.82μA·cm-2 after tempered; AC impedance measurements show that the passive film of tempered X80 steel was loose, which is consistent with the observations of atomic force microscopy.
出处
《腐蚀与防护》
CAS
北大核心
2013年第5期385-387,共3页
Corrosion & Protection
基金
国家自然科学基金(51174171)
关键词
低温回火
电化学行为
极化曲线
电化学阻抗谱
low-temperature tempering
electrochemical behavior
polarization curve
EIS
