LIU Xinhua, ZHOU Kun, HAN Jie, et al. Scale/corrosion inhibition and biodegradation of lysine modified polyaspartic acid[J]. CIESC Journal, 2018, (5): 2127-2136.
LIU Xinhua, ZHOU Kun, HAN Jie, et al. Scale/corrosion inhibition and biodegradation of lysine modified polyaspartic acid[J]. CIESC Journal, 2018, (5): 2127-2136.DOI: 10.11949/j.issn.0438-1157.20171199.
A poly-aspartic acid derivative (Lys-PASP) was synthesized by ammonia reaction of L-lysine. FTIR characterization of the polymer demonstrated that Lys-PASP contained carboxyl and amide groups. SEM study indicated that adding Lys-PASP changed growth process and morphology of CaCO3 and CaSO4 crystals such that loose and fine calcium scale could be formed
which prevented developing dense-structured calcium scale and achieved a good scale inhibition. The addition of Lys-PASP also caused lattice distortion of calcium scale crystals and inhibited surface pitting corrosion. Besides
a layer of adsorption film on surface by chemical and physical adsorption assisted to achieve a better corrosion inhibition effect. The scale inhibition efficiency of Lys-PASP graft copolymer to CaCO3 and CaSO4 was closely related to Lys-PASP dosage
Ca2+ concentration and system temperature. At 10 mg·L-1Lys-PASP
the CaCO3 scale inhibition efficiency was 98.7% and that of CaSO4 was close to 100%. Lys-PASP exhibited good scale inhibition at temperature 80℃and Ca2+ concentration at 500 mg·L-1 and 7000 mg·L-1. Furthermore
gravimetric study showed that corrosion inhibition efficiency of Lys-PASP is 13% higher than that of PASP when both Lys-PASP and PASP were 150 mg·L-1. Lys-PASP polymer is easily biodegradable per oscillating incubator study.