Abstract The effect of corrosion products on the inhibition effect of pyrimidine derivative inhibitor (DABTP) for the corrosion of N80 carbon steel in supercritical CO2 oilfield produced water was studied by electrochemical measurements, surface characterization, and theoretical calculations. It is found that DABTP exhibits high inhibition performance for bare carbon steel, while the formation of corrosion products (Fe3C, FeCO3) after pre-corrosion reduces the inhibition effect of DABTP. Theoretical calculations indicate that DABTP preferentially adsorb on FeCO3 film instead of Fe surface, which results in the reduction of inhibition effect of DABTP after FeCO3 film formed on the carbon steel surface.

中文翻译：

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超临界CO2条件下腐蚀产物对嘧啶衍生物对碳钢腐蚀抑制作用的影响

摘要 通过电化学测量、表面表征和理论计算，研究了腐蚀产物对嘧啶衍生物抑制剂(DABTP)在超临界CO2油田采出水中对N80碳钢腐蚀的抑制作用。发现DABTP对裸碳钢表现出较高的缓蚀性能，而预腐蚀后腐蚀产物(Fe3C、FeCO3)的形成降低了DABTP的缓蚀效果。理论计算表明，DABTP优先吸附在FeCO3薄膜上而不是Fe表面，导致在碳钢表面形成FeCO3薄膜后DABTP的抑制作用降低。