Investigation of adsorption and inhibitive effect of phosphite on corrosion of mild steel in hydrochloric acid media

摘要

The inhibition behaviour of a phosphite compound: NaMg(H2PO3)3.H2O (abbr. PhMg) on C38 steel in 1 M HCl solutions was investigated at 25 °C using electrochemical and weight loss methods. The results indicated that the title compound inhibited the corrosion of steel and the extent of inhibition increased with its concentrations. A mixed-inhibition mechanism is proposed for the inhibitive effect of PhMg. Effect of temperature is investigated in the (313-353 K) range.The determination of activation and adsorption parameters indicated that the inhibition action in the presence of PhMg is due to physical adsorption.