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Abstract

Hydrogen penetration (HP), hydrogen evolution reaction (HER), and corrosion rates of iron in the absence and presence of hydrogen sulphide and organosulphur compounds at temperatures between 10 and 70°C have been investigated. The rates of HE and corrosion of iron in H₂SO₄ increased on the addition of hydrogen sulphide. Promotion of HP by organosulphur compounds is attributed to hydrogen sulphide, which is formed by electrochemical hydrogenation. The rate of HP in the presence of these compounds increased in the order: diethyl sulphide < ethyl mercaptan < thiourea < hydrogen sulphide < carbon disulphide. The activation energiesfor HER and HP were 57·3 and 36·8 kJ mol^-1, respectively. In the presence of hydrogen sulphide and the organosulphur compounds, the activation energy for HP decreased to 31·8 kJ mol^-1, while the activation energy for the HER did not change appreciably.

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Kinetics of sulphide promoted hydrogen penetration of iron

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