Abstract The paper deals with the general corrosion of carbon steel in geothermal plants for conveying and re-injecting condensates. The results of electrochemical and weight loss tests are discussed in function of sulphite and thiosulphate concentrations typical of Italian geothermal power plants. Thiosulphates can inhibit the reactions between oxygen and sulphites and increase the corrosion rate, but they control the acidification resulting from the reactions of sulphites with oxygen. In anaerobic solutions, both species modify mainly the cathodic process. In the absence of oxygen, the corrosion process leads to the formation of mackinawite scales, while iron sulphide forms due to the reduction of thiosulphate and sulphite.

中文翻译：

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硫代硫酸盐和亚硫酸根离子对钢腐蚀的影响

摘要 本文研究了用于输送和回注冷凝液的地热发电厂中碳钢的全面腐蚀。电化学和重量损失测试的结果在意大利地热发电厂典型的亚硫酸盐和硫代硫酸盐浓度的函数中进行了讨论。硫代硫酸盐可以抑制氧与亚硫酸盐之间的反应并增加腐蚀速率，但它们控制亚硫酸盐与氧反应导致的酸化。在厌氧溶液中，两种物质主要改变阴极过程。在没有氧气的情况下，腐蚀过程会导致形成马其维石鳞片，而由于硫代硫酸盐和亚硫酸盐的还原而形成硫化铁。