Synthesis, Scale and Corrosion Inhibition of Modified Polyaspartic Acid

Abstract

Modified polyaspartic acid was prepared from aspartic acid and polysuccinimide that was thermal condensation polymer of aspartic acid. The properties of scale and corrosion inhibition of modified polyaspartic acid were studied. The structure of modified polyaspartic acid was characterized by means of FTIR. Calcium carbonate crystals in scale samples and corrosive test piece were analyzed by means of SEM. The results showed that under Ca²⁺ 400 mg L^-1, HCO₃ – 800 mg L^-1 and modified polyaspartic acid 6 mg L^-1, the scale inhibition rate of modified polyaspartic acid was 100 %. The modified polyaspartic acid possessed good corrosion inhibition performance and the corrosion inhibition rate of modified polyaspartic acid could reach 86.26 %. Modified polyaspartic acid could distort calcium carbonate crystallite and made calcium carbonate crystallite more dispersive. The test piece was immersed in solution with modified polyaspartic acid, the sample had no pits on its surface.