The corrosion inhibition effect and mechanism of rhamnolipid (RL) were studied for X65 steel in oilfield-produced water saturated with CO₂ using the weight loss method, electrochemical measurements, surface analysis, surface-enhanced Raman spectroscopy (SERS), and quantum chemical calculations. The results prove that RL is an excellent inhibitor against CO₂ corrosion and predominantly inhibits the anodic corrosion reaction of X65 steel. The inhibition performance of RL is connected with surface activity and molecular structure. RL adsorbs on the metal surface by the reactivity centers to form a protective film, and the film has good inhibition ability for X65 steel for up to 168 h.

中文翻译：

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鼠李糖脂对X65钢在CO2饱和油田采出水中的缓蚀性能及机理

采用失重法、电化学测量、表面分析、表面增强拉曼光谱（SERS）和量子化学计算，研究鼠李糖脂（RL）在CO ₂饱和的油田采出水中对X65钢的缓蚀作用及其机理. 结果证明RL是一种优异的CO ₂腐蚀抑制剂，主要抑制X65钢的阳极腐蚀反应。RL 的抑制性能与表面活性和分子结构有关。RL通过反应中心吸附在金属表面形成保护膜，该膜对X65钢具有良好的抑制能力长达168 h。