Abstract The effect of flow rate on localized corrosion of X70 steel in supercritical CO2-saturated aqueous phase was studied. Results shown that flow rate changed the predominant type from general corrosion (static condition) to localized corrosion (dynamic condition), and the localized corrosion rate gradually increased with time under dynamic condition. The main localized corrosion type initiated at the early corrosion stage the local spalling amorphous layer transformed to FeCO3 scale, and localized corrosion could also occur due to the broken of dense FeCO3 scale. The critical diameter of the pit for FeCO3 scale growth inside it decreased exponentially with flow rate.

中文翻译：

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超临界CO 2 环境下流速对X70钢局部腐蚀的影响

摘要 研究了流速对超临界CO2饱和水相中X70钢局部腐蚀的影响。结果表明，流速使主要类型由全面腐蚀（静态条件）转变为局部腐蚀（动态条件），并且在动态条件下局部腐蚀速率随时间逐渐增加。主要的局部腐蚀类型发生在早期腐蚀阶段，局部剥落的非晶层转变为 FeCO3 氧化铁皮，也可能由于致密的 FeCO3 氧化皮破裂而发生局部腐蚀。FeCO3 水垢在其内部生长的坑的临界直径随流速呈指数下降。