Experimental and Theoretical Investigation of the Corrosion Properties of Steel X13 in the Acetic Acid at 20 and 80°с

Abstract

Polarisation curves of stainless steel Х13 in a 5% NaCl + 0.5% CH3COOH + CH3COONa + CO2 (PCO2 = 0.1 МPa) solution at рН 3 and 4 and temperatures 20 and 80°С were obtained by the potentiostatic method. The corrosion-electrochemical characteristics of the steel in these environments were measured. The potential – pH diagrams of system steel X13 – CH3COOH – CO2 – H2O were constructed and the corrosion behaviour of the steel was determined using these diagrams. The passivation of the steel may proceed due to the formation of iron chromite (FeCr2O4) phase layer and of iron oxalate (FeC2O4) polylayer.