Cathodic kinetics of API X70 pipeline steel corrosion in H 2 S containing solutions under turbulent flow conditions

Abstract

A study has been carried out on the effect of hydrodynamics, temperature and hydrogen sulphide (H₂S) concentration on the corrosion of API X70 steel in a flowing 3 wt-% sodium chloride (NaCl) solution. Potentiodynamic polarisation curves were used to characterise the corrosion behaviour of X70 pipeline steel in 3 wt-%NaCl solutions with H₂S concentrations 0, 100, 650 and 2550 ppm at two temperatures, 20 and 60°C, and at turbulent flow conditions. To control flow conditions, the rotating cylinder electrode (RCE) in turbulent flow regime (100-5000 rev min^&minus1) was used. It was found that the measured cathodic current is influenced by flow and therefore by a diffusion component. By comparing the theoretical and experimental cathodic currents, the H⁺ reduction reaction is proposed as the main contribution to the total measured cathodic current density.

Keywords

H2S CORROSION POLARISATION CURVES RCE TURBULENT FLOW

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