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不同CO2壓力下形成的N80鋼腐蝕產物膜特征

Characteristics of N80 steel corrosion scales forming under different CO2 pressures

  • 摘要: 對N80鋼在不同CO2壓力下進行高溫、高壓腐蝕實驗,根據失重法計算N80鋼的腐蝕速率,利用掃描電鏡觀察腐蝕產物膜的微觀形態,分析腐蝕產物膜的厚度和Ca元素含量,利用電化學阻抗譜和極化曲線法測試了腐蝕產物膜的電化學性能,并對腐蝕產物膜與基體間的剪切強度進行了測試.結果表明,隨CO2壓力增加,N80鋼腐蝕速率增大;腐蝕產物膜晶粒尺寸基本不變,膜中微觀缺陷數量逐漸增多;腐蝕產物膜電阻和反應電阻呈逐漸增加的趨勢;腐蝕產物膜與N80鋼基體結合的剪切強度下降,促進了N80鋼的腐蝕.

     

    Abstract: Corrosion experiments of N80 steel were conducted under different CO2 pressures by a high temperature and high pressure autoclave. The corrosion rate of N80 steel was calculated by the mass-loss method, the micrograph, thickness and Ca content of the corrosion scales were observed by scanning electron microscopy, and the electrochemical properties were measured and analyzed by electrochemical impedance spectra and potentiodynamic polarization. The shear strengths between the corrosion scale and the N80 steel substrate were measured. The results show that with the increase of CO2 pressures the corrosion rate of N80 steel increases, the grain sizes of the corrosion scales show no obvious difference, and the amount of microcosmic flaws in the corrosion scales increases gradually. The resistance of the corrosion scale and the reaction resistance show the increase tendency. The shear strength between the corrosion scale and the N80 steel substrate decreases with the increase of CO2 pressure, leading to the increase in corrosion rate.

     

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