Abstract Naphthenic acids corrosion is generally considered to leave no corrosion product on steel surface. However, our prior research demonstrates that a protective oxide scale is formed in corrosion with model acids under stagnant conditions. In present study, the corrosion by model acids and a reactive sulfur compound has been investigated alone and in combination in a flow through system. None of the model acids alone forms an oxide scale. However, mixtures of the acid and sulfur compound form a protective scale consisting of an oxygen-containing layer underneath a sulfide layer. A mechanistic model of corrosion and scale formation is proposed.

中文翻译：

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非湍流环烷酸腐蚀中硫化合物对保护垢形成的影响

摘要 环烷酸腐蚀一般认为在钢表面不留下腐蚀产物。然而，我们之前的研究表明，在静止条件下，模型酸腐蚀会形成保护性氧化皮。在目前的研究中，模型酸和活性硫化合物的腐蚀已在流通系统中单独和组合进行了研究。模型酸中没有一种单独形成氧化皮。然而，酸和硫化合物的混合物形成了由硫化物层下方的含氧层组成的保护性水垢。提出了腐蚀和水垢形成的机理模型。