The inhibition of calcium phosphate (Ca/P) precipitation by natural organic polyelectrolytes, bio- and hybrid polymers, homo- and co-polymers of acrylic acid and maleic acid containing different functional groups was examined in aqueous solution. Additionally, commonly used phosphonates were also evaluated as Ca/P inhibitors. It has been found that performance of additive (polymeric and non-polymeric) as Ca/P inhibitor depends upon additive concentration, ionic charge, and molecular weight. Based on the inhibition data, the ranking in terms of decreasing effectives is: biopolymer > hybrid polymer > natural organic polyelectrolytes. Among synthetic polymers the ranking order is: terpolymer > co-polymer > homopolymer. Results on phosphonates evaluation reveal that compared to synthetic polymers, phosphonates show poor performance as Ca/P inhibitors.

Subject
Acids, Calcium phosphates, Water, Inhibitor performance, Precipitation (solids), Copolymers, Additives, Phosphonates, Functional groups, Scale inhibitors, Polymers, Scale formation, Corrosion inhibitors
Keywords:
calcium phosphate, inhibition, bio-, hybrid, synthetic polymers, phosphonates, cooling water systems
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2017
Association for Materials Protection and Performance (AMPP)
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