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CO2分壓對N80鋼腐蝕產物膜保護性能的影響

Influence of CO2 partial pressure on the protection property of corrosion scale formed on N80 steel

  • 摘要: 利用高溫高壓釜對N80鋼進行了兩種溫度、不同CO2分壓下的腐蝕實驗.測量了腐蝕速率,觀察了腐蝕產物膜的宏觀形貌及去除腐蝕產物膜后金屬基體的表面狀態,用掃描電鏡(SEM)觀察了腐蝕產物膜的微觀形貌并測量了膜的厚度,對在不同條件下成膜的N80鋼進行了電化學極化曲線與交流阻抗譜(EIS)分析.結果表明CO2分壓升高,腐蝕產物膜保護性能提高,但由于介質的腐蝕性增強,腐蝕速率上升;膜局部缺陷是導致金屬基體表面點蝕的主要誘因,CO2分壓升高有利于減少65℃時膜表面的局部缺陷;在90℃下腐蝕產物膜的保護性能比65℃下對CO2分壓的變化更為敏感.

     

    Abstract: Corrosion tests of N80 steel under different CO2 partial pressures at 65℃ and 90℃ were carried out by a self-made high-temperature high-pressure autoclave. The mass losses of the steel under different CO2 partial pressures were measured. The morphologies of the corrosion scale and the descaled N80 steel were observed by SEM, and the thickness of the scale was measured. Electrochemical polarization curve and impedance spectroscopy analysis (EIS) were employed to study the corrosion behavior of N80 pre-corroded under different CO2 partial pressures at two temperatures. The results show that as the CO2 partial pressure increases, the protection property of the scale becomes better, but the corrosion rate increases because of the increase in solution corrosivity. The local defects of the corrosion scale are responsible for the pitting corrosion of metal matrix, the increase in CO2 partial pressure makes for reducing the defects. Compared with 65℃, the protection property of the corrosion scale is more sensitive to the change of CO2 partial pressure at 90℃.

     

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