Corrosion Inhibition Ability and Its Synergistic Effect of PASP on Carbon Steel in Phosphoric Acid Solution

By using potentiodynamic polarization method,the current study reveals the corrosion inhibition ability of polyaspartic acid(PASP) on carbon steel in 20 % phosphoric acid solution.The results show that the inhibition efficiency of PASP increase significantly at 20 ℃ with the increasing of PASP concentration.The inhibitor efficiency η reaches as high as 76.65 % with the PASP concentration of 1.0 g/L.In PASP-SDS system,the maximum inhibition efficiency is found to be 78.66 % when combining PASP and SDS at the same concentration of 0.25 g/L;which indicates a positive synergistic effect.This work also proves that the anode inhibition reaction contributes most to the inhibitive effect of PASP.