Abstract The influence of sulphide on the electrochemistry of carbon steel in neutral to slightly alkaline sulphide solutions was investigated using electrochemical and surface analytical techniques. Small concentrations of sulphide were found to promote anodic dissolution as FeII carbonate complexes and to destabilize FeIII oxides leading to the loss of passivity, especially at pH ≤ 9. The dominant phase formed was mackinawite, while reactions between FeIII and sulphide led to the formation of oxidized S species (elemental Sand sulphate), polysulfides, and pyrite.

中文翻译：

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硫化物、碳酸氢盐和碳酸盐在微碱性溶液中对碳钢电化学的影响

摘要 使用电化学和表面分析技术研究了硫化物在中性至弱碱性硫化物溶液中对碳钢电化学的影响。发现低浓度的硫化物会促进阳极溶解，成为 FeII 碳酸盐复合物，并使 FeIII 氧化物不稳定，导致钝性丧失，尤其是在 pH ≤ 9 时。形成的主要相是马其维石，而 FeIII 和硫化物之间的反应导致形成氧化的 S 物质（元素硫酸砂）、多硫化物和黄铁矿。