Materials Performance

JUN 2016

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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48 JUNE 2016 MATERIALS PERFORMANCE NACE INTERNATIONAL: VOL. 55, NO. 6 CHEMICAL TREATMENT Using the experimental protocol de- scribed previously, several iron stabiliza- tion experiments were carried out in the presence of 5 and 10 ppm of phosphonates. Results presented in Figure 4 clearly show that iron stabilization strongly depends upon phosphonate concentration and ar- chitecture. Based on the data presented, t h e p h o s p h o n a t e s c a n b e ra n k e d a s follows: • At 5 ppm : HEDP>PAPEMP>>PBTC, AMP, and HPA • At 10 ppm : PAPEMP>HEDP>PBTC, AMP, and HPA Conclusion Based on th e results of thi s study, PAPEMP, in optimum concentrations, pro- vided superior control of calcium-based scale deposition and superior iron stabili- zation in natural waters when compared to the other phosphonates tested. References 1 Z. Amjad, K. Demadis, eds., Mineral Scales and Deposits: Scientific and Technological Approaches (Amsterdam, The Netherland: Elsevier, 2015). 2 A.T. Kan, et al., "A Mechanistic Interpretation of the Precipitation and Dissolution of Diva- lent Metal Phosphonates," CORROSION/93, paper no. 459 (Houston, TX: NACE Interna- tional, 1993). 3 Z. Amjad, "Gypsum Scale Inhibition Using Biopolymers and Synthetic Polymers," MP 51, 10 (2012): pp. 48-52. 4 Z. Amjad , J. Penn, "Impact of Iron Oxide (Rust) on the Performance of Calcium Car- bonate Inhibitors, Part 1," MP 53, 11 (2014): pp. 52-55. 5 Z. Amjad, "Calcium Phosphate Scale Control in Industrial water Systems," Water Treat- ment J. 1-2 (2010): pp. 7-15. 6 Z. Amjad, "Influence of Polymer Architecture on the Stabilization of Iron and Manganese Ions in Aquesous Systems," Tens. Surf. Det. 44, 4 (2007): pp. 202-208. 7 O. Dogan, et al., "Polyelectrolytes Inhibition Effect on Crystallization of Gypsum," Crys. Res. Technol. 39 (2004): pp. 1,108-1,114. 8 J. Gill, "A Novel Inhibitor for Scale Control in Water Desalination," Desalination 124 (1999): pp. 43-56. 9 Z. Amjad, et al., "Calcium Sulfate Dihydrate (Gypsum) Scale Inhibition by PAA, PAPEMP, and PAA/PAPEMP Blend," Int. J. Corros. Scale Inhib. 3, 1 (2014): pp. 35-47. ZAHID AMJAD is a visiting professor, School of Arts and Sciences, Walsh Univer- sity, 2020 E. Maple St., North Canton, Ohio 44720. He has worked in research and development for more than 30 years, developing new proprietary antiscalants and dispersants for industrial water systems including boiler, cooling, desalina- tion, oilfield, and home care applications. He has taught undergraduate and gradu- ate-level chemistry courses. He has edited eight books on various aspects of water treatment; presented papers at national and international conferences including NACE, IWC, AWT, ACS, and others; and has published more than 150 journal articles. A NACE member since 1985, Amjad received the AWT Tech nologist of the Year Ray Baum Memorial Award and has organized technical symposia for NACE and ACS conferences. He is a member of the MP Editorial Advisory Board. He received the NACE Fellow and Technical Achievement awards. ■ Universal corrosion resistance in extremely high temperatures. ■ Custom complex shapes in any size with tight tolerances. Visit our NEW website: For more information, technical data & case studies contact: ■ 716-278-6233 ® Eliminate Downtime & Minimize Maintenance Costs Reduce Energy Consumption & Emissions Maximize Productivity

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