Melting decomposition of sulfur by sulfuric acid; corrosion of stainless steel by ammonium bisulfate
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The process of decomposing sulfuric acid in its molten state at 300°C–320°C into ammonium bisulfate causes corrosion of the equipment. I have a material on hand (the manufacturer described it as low-carbon stainless steel, but didn’t specify exactly which type); it shows good resistance to corrosion in experiments, while other stainless steels do not perform as well. What I want to know is what is the corrosion mechanism of ammonium bisulfate on stainless steel during the process in which sulfuric anhydride is decomposed into ammonium bisulfate in its molten state? Furthermore, once we understand its corrosion mechanism, what other corrosion-resistant materials are available to meet the production requirements? I hope experienced experts can offer some help; I would be extremely grateful.
We provide information on operating temperatures, pressures, and other environmental conditions, and recommend the appropriate PTFE (tetrafluoro, polytetrafluoroethylene) spraying anti-corrosion processes, such as PFA, FEP, F40, F30, and so on.