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The Anti-pitting Mechanism of Low Cr Alloy Steel in C02 Corrosion Environment

机译：低Cr合金钢在CO 2腐蚀环境下的防点蚀机理

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With the better localize corrosion resistance than carbon steel, the low Cr (1%-5%) alloy steels are amongst the most promising candidates as pipeline steel to transport oil and gas. An increase in Cr content leads to a lower susceptibility to localized corrosion. The improved CO_2 corrosion resistance of 3-5%Cr steel stems from the better protectiveness of corrosion product film. To understand the formation of corrosion protective film on 3%Cr steel, a large number of autoclave experiments simulating the oilfield environment had been carried out at various corrosion times. The morphology and the composition of the corrosion product film were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), potentiodynamic polarization curve and electrochemical impedance spectrum (EIS), respectively. The results showed that, the higher Cr/Fe ratio of the corrosion product film, the better corrosion resistance. And the changes of the EIS plot clearly reflect the emergance and evolvement of the pit observed by SEM.
机译：低铬（1％-5％）合金钢具有比碳钢更好的局部耐腐蚀性，是最有前途的候选材料之一，是用于输送石油和天然气的管道钢。 Cr含量的增加导致局部腐蚀的敏感性降低。 3-5％Cr钢提高的CO_2耐腐蚀性归因于腐蚀产物膜的更好的保护性。为了了解在3％Cr钢上形成腐蚀防护膜的方法，已在不同腐蚀时间进行了许多模拟油田环境的高压釜实验。分别使用扫描电子显微镜（SEM），能量色散谱（EDS），电势极化曲线和电化学阻抗谱（EIS）分析腐蚀产物膜的形貌和组成。结果表明，腐蚀产物膜的Cr / Fe比值越高，耐蚀性越好。 EIS图的变化清楚地反映了通过SEM观察到的凹坑的出现和演变。

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