Factors affecting high-temperature sulfur corrosion
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Salt content: A small amount of salt present in the medium can act as a corrosion inhibitor to suppress high-temperature sulfur corrosion. After crude oil is desalted and its salt content is below 2.85 mg/L, although this reduces corrosion in the low-temperature light oil fractions, it has an adverse effect on the high-temperature heavy oil fractions. This sentence is from the \"Handbook on Corrosion and Protection of Equipment in Petrochemical Plants.\" Could someone explain the principle behind it? Why can a small amount of salt act as a corrosion inhibitor to prevent sulfur-induced corrosion at high temperatures? There is also the source for that “salt content of 2.85 mg/L”.
There is also no source indicated for the value of \"salt content of 2.85 mg/L\“. Electrodesalination has specified limits for salt content (below 3–5 mg/L); a salt content of less than 2.85 mg/L appears to be experimental data, and no source was found for it. Take a seat and wait for the expert to reply.
I’ve found the source of this data; in the book \"Corrosion and Protection of Refinery Equipment\" published in 1977, there is a table titled \"Relationship between Crude Oil Desalination Degree and High-Temperature Corrosion\", which contains experimental data. But that book only mentioned in passing that \"halides have a certain inhibitory effect on high-temperature corrosion,\" without going into detail. I guess this conclusion is from foreign research.