【摘要】 针对沈阳模拟土壤中HCO₃^-浓度变化对高强度X90管线钢的应力腐蚀行为进行了系统的研究。结果表明:X90钢的腐蚀速率随着HCO₃^-浓度的增加呈现出先增大后减小的趋势。HCO₃^-对X90管线钢腐蚀速率主要影响因素是HCO₃^-浓度变化影响钝化膜的保护性。当溶液HCO₃^-浓度为7%时,钝化膜的保护性最弱,X90管线钢的电化学腐蚀速率最快。此外,X90钢在沈阳土壤模拟溶液中的应力腐蚀敏感性呈现出先增大后减小的趋势,与电化学腐蚀速率一致,其应力腐蚀开裂机理为阳极溶解机理。更多还原

【Abstract】 The effect of the variation of HCO₃^- concentration in an artificial soil solution, which aims to simulate the liquid of the soil nearby a pipeline situated at Shenyang area, on the stress corrosion cracking behavior of high-strength X90 pipeline steel was systematically studied. The results show that the corrosion rate of X90 steel increases first and then decreases with the increase of HCO₃^- concentration. The variation of HCO₃^- concentration on the corrosion rate of X90 pipeline steel may be ascribed to that the protective properties of the formed passive film may alter with the varying HCO₃^- concentration.When the HCO₃^- concentration of the solution is 7%, the protectiveness on of the passive film is the weakest, and the electrochemical corrosion rate of X90 pipeline steel is the fastest.更多还原