Add time:08/22/2019         Source:sciencedirect.com

Novel modified polyaspartic acid with Schiff base structure was synthesized for the first time. Then the corrosion inhibition behavior of polyaspartic acid (PASP) and modified polyaspartic acid (PASP/SB) on carbon steel in 1 M HCl was investigated using gravimetric methods, electrochemical measurements, AFM and SEM. The obtained results indicate PASP/SB as a mixed-type corrosion inhibitor shows the maximum inhibition efficiency of 90.39% at low concentration of 80 ppm, which is much higher than that of PASP. The inhibition performance of PASP/SB is slightly affected by temperature and flow in comparison with PASP. It is found that the inhibition effect of PASP/SB was primarily due to its physical and chemical adsorption on steel surface. Quantum chemical studies confirm the better inhibition and adsorption property of PASP/SB on carbon steel is attributed to the new functional groups on side chain.

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