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硫化氫質量濃度和溫度對碳鋼在NACE溶液中腐蝕行為的影響

Effect of H2S concentration and temperature on the corrosion behavior of carbon steel in NACE solution

  • 摘要: 采用動電位極化曲線和電化學阻抗譜等電化學實驗方法以及掃描電鏡和能譜等表面分析技術對20#碳鋼在不同H2S質量濃度(0,95.61,103.22,224.16 mg·L-1)、不同溫度(25,35,45℃)下的NACE溶液(含CO2)中腐蝕行為進行了研究,同時對該環境下腐蝕產物的形成機制進行了探討.發現在含有CO2的NACE溶液中,加入少量H2S,能加劇碳鋼腐蝕,加速陽極鐵的溶解和陰極氫氣的析出.隨著H2S質量濃度的增加,腐蝕電流密度增大,碳鋼腐蝕加劇.溫度升高,腐蝕極化電阻變小,腐蝕也會加劇.腐蝕試樣外層絮狀腐蝕產物主要是鐵碳化物,接近基體表面的腐蝕產物主要是鐵硫化物.

     

    Abstract: The electrochemical corrosion behavior of 20# carbon steel in NACE solutions containing different mass concentrations of H2S (0, 95. 61, 103. 22, and 224. 16 mg·L-1) at different temperatures (25, 35, and 45℃) was investigated by potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The formation mechanism of corrosion products was also discussed. It is found that the corrosion rate of the carbon steel increases significantly with the addition of a small amount of H2S in the NACE solution by promoting both the anodic iron dissolution and the cathodic hydrogen evolution. The corrosion current density of the carbon steel enhances with the increment of H2S concentration. As the temperature of the electrolyte solution increasing, the corrosion rate also increases. The outer loose corrosion products are mainly iron carbonate; but corrosion products formed on the steel surface are mainly composed of iron sulfides.

     

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