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Corrosion kinetics data for the S-H₂S-RCOOH system

2026-06-29View Original

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Currently, there is a limited amount of comprehensive experimental data on the corrosion kinetics of the S-H₂S-RCOOH system that is available publicly. Therefore, it is only possible to derive some relevant kinetic patterns and measured reference values based on existing research findings in the oil and gas/refining industries: The reference corrosion rate for carbon steel in the presence of naphthenic acids is such that, under typical conditions with high acid content in crude oil, the actual corrosion rate of carbon steel in this system can reach 20 mm/year at locations such as the outlet lines of vacuum distillation units. For grade 20 steel, the corrosion rate in the outlet lines of atmospheric pressure furnaces is around 13 mm/year. In the case of composite steel plates, the 3 mm thick stainless steel layer may suffer from localized corrosion penetration within 9 months. Dynamics of influence – Temperature aspect: Above 288°C, for every increase of 55°C in temperature, the naphthenic acid corrosion rate of carbon steel doubles ; In the temperature ranges of 270–280°C and 350–400°C, the apparent activation energy for the corrosion reaction decreases significantly, resulting in a sharp increase in the reaction rate. H₂S concentration level: Low concentrations of H₂S (100–500 ppm) inhibit both anodic and cathodic reactions, resulting in a corrosion rate of only about 50% that of a system with pure CO₂ ; When the H₂S concentration rises to 6%~10%, the adsorption of HS⁻ on the steel surface induces a catalytic effect, causing the rate of the anodic reaction for iron dissolution to return to the level observed in a pure CO₂ system. Acid number dimension: When the acid number of crude oil is ≥0.5 mgKOH/g, the corrosion reaction rate shows a basically linear positive correlation with the acid number. Currently, no unified general equation for the corrosion kinetics of this system exists in available public literature; key parameters such as reaction rate constants and transfer coefficients under different operating conditions still require determination through targeted high-temperature and high-pressure experiments, taking into account specific materials, temperature, flow rate, and medium composition.

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