Abstract The effect of citrate ions on the passive film stability on carbon steel, at pH 13, was evaluated. The study involved cyclic voltammograms, potentiodynamic polarization curves, micro-Raman spectroscopy and weight-loss tests. No beneficial effects on delaying or inhibiting pitting were observed in the presence of citrate ions. Organic compounds with carboxylate groups are promising corrosion inhibitors. However, the incorporation of citrate ions is clearly harmful to carbon steel in alkaline solutions and accelerates the corrosion process. Citrate ions adsorption is not observed on passive steel. Instead, citrate ions can unexpectedly dissolve the passive layer facilitating the corrosion process.

中文翻译：

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柠檬酸根离子在碱性溶液中对碳钢腐蚀过程的意外影响

摘要 评估了柠檬酸根离子对碳钢钝化膜稳定性的影响，pH 值为 13。该研究涉及循环伏安图、动电位极化曲线、微拉曼光谱和失重测试。在柠檬酸根离子的存在下，没有观察到对延迟或抑制点蚀的有益效果。具有羧酸盐基团的有机化合物是有前途的腐蚀抑制剂。然而，柠檬酸根离子的掺入显然对碱性溶液中的碳钢有害并加速腐蚀过程。在钝化钢上未观察到柠檬酸根离子吸附。相反，柠檬酸根离子会出人意料地溶解钝化层，促进腐蚀过程。