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How to prevent S-H₂S-RCOOH corrosion

2026-06-29View Original

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By combining the mechanism of action of this corrosion system as described earlier with actual industrial cases, S-H₂S-RCOOH corrosion can be controlled through multiple measures: 1. Select appropriate corrosion-resistant materials – for areas subject to severe corrosion, 316L steel with a Mo content of over 2.3% should be used; in situations without intense erosion, solid solution-annealed 1Cr18Ni9Ti can also be employed; Economical corrosion-resistant materials such as 20R+0Cr13 composite sheets and aluminized steel can also be used to replace ordinary carbon steel, thereby significantly improving its corrosion resistance. 2. Optimize the structural and process design by grinding the welds on the inner walls of equipment and pipelines smooth, eliminating defects such as misalignment and weld bumps that can cause eddy currents ; Appropriately increase the diameter of the oil transfer line at the furnace outlet to reduce the flow velocity of the medium, thereby preventing localized erosion from exacerbating corrosion. 3. Add specialized corrosion inhibitors: Choose oil-soluble corrosion inhibitors such as imidazolinones and modified Mannich bases that are suitable for these operating conditions; these inhibitors form a dense protective film on the metal surface, preventing contact between naphthenic acids, H₂S, and the metal, thereby effectively reducing the corrosion rate. 4. Pre-process control: By controlling the acid value of the crude oil during blending, it is kept below the safe threshold of 0.5 mgKOH/g, thereby reducing the driving force for corrosion in the system from the source.

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