Effect of Flow Condition on the H2S Corrosion Inhibition of a Supermartensitic Stainless Steel with a Gemini Surfactant

Abstract

A nonionic Gemini surfactant obtained from palm oil has been used as corrosion inhibitor of UNS S41425-type supermartensitic stainless steel in an H2S-containing environment under hydrodynamic conditions at 50 °C. Techniques involved potentiodynamic polarization curves, linear polarization resistance and electrochemical impedance spectroscopy measurements. Results have shown that under static conditions, the best inhibitor performance was obtained by applying 25 ppm and it affected both anodic and cathodic electrochemical reactions. Under hydrodynamic conditions, in the absence or presence of inhibitor, the corrosion rate increased with an increase in the rotating speed due to an enhancement in the reactants and inhibitor mass transfer.