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How to mitigate S-H2S-RSH corrosion

2026-06-28View Original

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Taking into account the locations, forms, and influencing factors of S-H2S-RSH corrosion as described earlier, the following targeted measures can be employed to mitigate this type of high-temperature sulfur corrosion: First, the key measure is to use corrosion-resistant materials. This is the most common method of protection in such corrosion scenarios. Commonly used corrosion-resistant steels include Cr5Mo and Cr9Mo furnace tubes, 1Cr18Ni9Ti heat exchanger tubes, and 20R+0Cr13 composite sheets, all of which provide stable corrosion resistance; Domestically developed chromium-free special steels such as 12A1MoV and 12SiMoVNbAl also exhibit good resistance to high-temperature sulfur corrosion. II. Optimize process operations: Regulate the operating temperature of the equipment appropriately to avoid operating at high corrosion-prone temperatures in the range of 350–425°C for extended periods of time ; Optimize the pipeline flow channel design to reduce the flow velocity of the medium, minimize the erosion damage caused by eddies and turbulence on the inner walls of the equipment, and prevent the FeS protective layer from being stripped off prematurely. III. Other auxiliary methods: The desalination process can be optimized during the crude oil pretreatment stage to keep the salt content of the crude oil within a reasonable range; the small amount of residual salt present can serve as an anti-corrosive agent, thereby indirectly reducing the corrosion rate caused by sulfur at high temperatures.

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