CO<sub>2</sub>分压对N80油管钢CO<sub>2</sub>腐蚀行为的影响

CO₂分压对N80油管钢CO₂腐蚀行为的影响

摘要: 利用高温高压反应釜进行腐蚀模拟试验。采用失重法、SEM和XRD等手段研究了CO2分压对N80油管钢在100 ℃下CO2腐蚀行为的影响。结果表明, N80钢的腐蚀速率随CO2分压升高而上升。不同CO2分压下腐蚀类型与腐蚀产物膜宏观形貌的变化相对应, 在低CO2分压下腐蚀产物膜完整覆盖。随着CO2分压的进一步升高, 腐蚀产物膜由局部覆盖转而重新完整覆盖。相应地, N80钢在低CO2分压下发生全面腐蚀, 然后随CO2分压的进一步升高, 腐蚀类型由局部腐蚀向全面腐蚀过渡。

Abstract: The effects of CO2 partial pressure on CO2 corrosion behavior of N80 steel at 100 ℃ were studied by autoclave test, together with weight loss method, SEM, and XRD. The results showed that the corrosion rate of N80 steel rose with the increase of CO2 pressure corresponding to the change of corrosion product film macro-morphology. At the low partial pressure of CO2, the corrosion product film was complete, then with the further increase of CO2 partial pressure, corrosion product film turned from incomplete to complete. Accordingly, at low CO2 partial pressure, the corrosion of N80 steel was general corrosion, and then with the further increase of CO2 partial pressure, corrosion characteristics were transformed from localized corrosion to general corrosion.