Synthesis of polyaspartic acid/5-aminoorotic acid graft copolymer and evaluation of its scale inhibition and corrosion inhibition performance

Polyaspartic acid/5-aminoorotic acid graft copolymer (PASP/5-AOA) was synthesized by the reaction of maleic anhydride , urea and 5-aminoorotic acid (5-AOA). The graft copolymer (PASP/5-AOA) was characterized by FT-IR and UV–VIS analyses. Its performance was evaluated by static scale inhibition method and dynamic corrosion testing . The results showed that PASP/5-AOA possessed super scale inhibition property against CaCO 3 and Ca 3 (PO 4 ) 2 as well as good corrosion inhibition property. Inhibition efficiency of PASP/5-AOA was close to 100% against CaCO 3 when the dosage was 1   mg/L in the simulation experiment. Corrosion inhibition efficiency was close to 60% and scale inhibition efficiency was close to 100% against Ca 3 (PO 4 ) 2 when the dosage was 12   mg/L in the simulation experiment. When PASP/5-AOA was added to the solution, CaCO 3 and Ca 3 (PO 4 ) 2 deposits show flower and cascade patterns with floppy accumulation by scanning electron microscopy (SEM).