Investigations on the influence of phosphonates in dispersing iron oxide (rust) by polymeric additives for industrial water applications

• Z. Amjad

Division of Mathematics and Sciences, Walsh University, 2020 E. Maple Street, N. Canton, Ohio 44270, USA

Abstract: The performance of polymeric and non-polymeric additives as iron oxide (rust) dispersants in aqueous system has been investigated. The polymers evaluated include: homopolymers of acrylic acid, aspartic acid; copolymers of acrylic acid : vinyl acetate; acrylic acid : hydroxylpropyl acrylate, maleic acid :sulfonated styrene; and terpolymer of acrylic acid : 2-acrylamido-2-methyl propane sulfonic acid :sulfonated styrene. Phosphonates (or nonpolymeric additives) tested include: hydroxyphosphono acetic acid, HPA; aminotris(methylenephosphonic acid), AMP; hydroxyethylidene 1,1-diphosphonic acid, HEDP; 2-phosphonobutane 1,2,4-tricarboxylic acid, PBTC; and polyamino polyether methylene phosphonic acid, PAPEMP. Based on the performance data, polymers effectiveness as iron oxide dispersants is: terpolymer > copolymer > homopolymer. Under similar experimental conditions, phosphonates exhibit poor performance as iron oxide dispersants. It has also been observed that presence of phosphonates exhibit antagonistic effect on the performance of polymers.

Keywords: iron oxide, rust, dispersion, polymers, phosphonates.

Int. J. Corros. Scale Inhib., 2014, 3, no. 2, 89–100 PDF (871 K)
doi: 10.17675/2305-6894-2014-3-2-089-100

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