EFFECT OF PROPARGYL ALCOHOL ON CORROSION AND HYDROGENATION OF STEEL IN HYDROCHLORIC-ACID SOLUTION

A study has been made to investigate the effect of propargyl alcohol (PA) on corrosion and hydrogenation of mild steel exposed in hydrochloric acid solution at different temperatures, concentrations, and exposure times. Different ions have been added to the inhibited acid solution to study their roles on the inhibitive performance of the inhibitor. Cr3+ and Cu2+ cations strongly improve the inhibitive performance of the inhibitor on corrosion and hydrogen adsorption by steel, whereas As3+, which improves the corrosion inhibitor's efficiency, has an accelerating effect on hydrogen adsorption. Propargyl alcohol in combination with Cu2+ and Cr3+ effectively controls the deterioration of tensile strength of steel in acidic solution, but an adverse effect is observed with As3+. Fe3+ has a deleterious action on the inhibitor's performance especially when present at a higher concentration (>2.5% as FeCl3). Addition of certain amino compounds along with PA in acid solution slightly improves the inhibitive performance. Effectiveness of the inhibitor improves with time and the time required to achieve maximum protection is reduced if Cr3+ and Cu2+ are present along with the inhibitor in the electrolyte.