Synthesis of Polyaspartic Acid/Chitosan Graft Copolymer and Evaluation of Its Scale Inhibition and Corrosion Inhibition Performance

Polyaspartic acid/Chitosan grafted copolymer (denoted as PASP/CS) was synthesized by using polysuccinimide and Chitosan as the starting materials. Structural characterization was conducted on the reaction product by infrared spectroscopy and ⁎ 1 HNMR. Static scale inhibition method and dynamic corrosion testing were used to explore the scale and corrosion inhibition performance of PASP and PASP/CS. The experimental results showed that The inhibition efficiency of graft copolymer is 89% for Ca3(PO4)2 scale, PASP is only 46% when inhibitor concentration is 8 mg/L. Moreover, the inhibition corrosion efficiency can reach up to 82%, with is 47% when inhibitor concentration is 25 mg/L. When PASP/CS was added to the solution, PASP/CS can change the structure of CaCO3 and Ca3(PO4)2 crystal, where the lattice distortion occurs and produced crystal grain size becomes smaller, presenting a dispersed state.