INHIBITION OF PROPARGYL ALCOHOL ON IRON CORROSION IN h2s-CONTAINING SULFURIC ACID SOLUTIONS

The inhibition of propargyl alcohol (PA) on iron corrosion in H 2S-containing sulfuric acid solutions has been studied using electrochemical potentiodynamic polarization method and impedance measurements. The results showed that PA could greatly retard the corrosion of iron in sulfuric acid containing H 2S, which was attributed mainly to the inhibition effect of PA on the anodic dissolution reaction of iron. It was also found that PA performed its function effectively when the temperature of solution was between 30℃ to 65℃. However, the inhibition effect of PA decreased enormously for the temperature higher than 65 0C. In addition, a polymer film of PA could gradually form on iron surface, and its protective ability was related with the surface state of corroded iron.H 2S could influence the polymerization of PA and damage the compatibility and integrity of the polymer.