Abstract
A novel biodegradable multifunctional scale and corrosion inhibitor containing carboxylic acid, sulpfonic acid, and phosphonic acid groups was synthesized from the monomers of itaconic acid (IA), sodium allysulfonate (SAS), and sodium hypophosphite (SHP) by oxidation–reduction initiator system. The optimum synthesis conditions were determined by orthogonal experiments. The performances of scale and corrosion inhibition, dispersion, and biodegradability of the IA/SAS/SHP copolymer were studied. The results showed that the IA/SAS/SHP copolymer has good performances of scale and corrosion inhibition, dispersion performance on ferric oxide, and biodegradability. When the concentration of IA/SAS/SHP copolymer was 20 mg/L, the scale inhibition rate was 95.1%. When the concentration of the IA/SAS/SHP copolymer was 60 mg/L, the corrosion rate was 0.02823 mm/a and the corrosion inhibition rate reaches above 90%. The CaCO3-scale samples and the corrosion testing pieces were observed and analyzed by SEM. The IA/SAS/SHP copolymer could destroy the growth habits of the crystal and lead to crystal distortion.
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