The Preparation and Performance Study of a Phosphate-Free Corrosion/Scale Inhibitor

Defang Zeng, Wei Zhang

School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, China.

DOI: 10.4236/jwarp.2012.47056                

Abstract

By using acrylic acid copolymer, sodium citrate, hydrolyzed polymaleic anhydride (HPMA), corrosion inhibitor D and Zn²⁺ synergist as raw materials, a multi-component phosphate-free corrosion and scale inhibitor was developed. The performance of the composite phosphate-free corrosion and scale inhibitor was evaluated using the rotary hanging sheet corrosion test, the static scale inhibition test and the corrosion electrochemical test. And the surface morphology of the carbon steel was observed by scanning electronic microscope (SEM). Orthogonal experiment results indicated that the optimal mass ratios of amino acid: Zn²⁺ synergist: HPMA: corrosion inhibitor D: acrylic acid copolymer was 0.5:10:12:1:8. It was also observed that phosphate-free corrosion and scale inhibitor based on an anodic reaction through the electrochemical corrosion experiment, its annual corrosion rate and scale inhibition rate reached 0.0176 mm·a^–1 and 98.3%, respectively, showing excellent corrosion and scale inhibition performance.

Keywords

Phosphate-free corrosion/scale Inhibitor; Static Scale Inhibition Method; SEM; Electrochemical Corrosion

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	D. Darling and R. Rakshpa, “Green Chemistry Applied to Corrosion and Scaleinhibitore,” Journal of Chemical Treatment, Vol. 23, No. 9, 1998, pp. 42-45.
[2]	Z.-M. Wang and L.-K. Cai, “The Study of Organic Phosphoric Acidtype Water Stabilizer,” Journal of East China Institute of Chemical Technology, Vol. 14, No. 5, 1898, pp. 603-608.
[3]	M. A. Quraishi, A. Singh and V. Kumar Singh, “Green Approach to Corrosion Inhibition of Mild Steel in Hydrochloric Acid and Sulphuric Acid Solutions by the Extract of Murraya Koenigii Leaves,” Materials Chemistry and Physics, Vol. 18, No. 122, 2010, pp. 114-122. doi:10.1016/j.matchemphys.2010.02.066
[4]	P. Kalaiselvi, S. Chellammal, et al., “Artemisia Pallens as Corrosion Inhibitor for Mild Steel in HCl Mediun,” Materials Chemistry and Physics, Vol. 18, No. 120, 2010, pp. 643-648. doi:10.1016/j.matchemphys.2009.12.015
[5]	A. Kumar Mishra and R. Balasubramaniam, “The Electrochemical Behaviour of Environment-Friendly Inhibitors of Silicate and Phosphonate in Corrosion Control of Carbon Steel in Soft Water Media,” Materials Chemistry and Physics, Vol. 55, No. 103, 2007, pp. 385-393.
[6]	P. C. Okafor, M. E. Ikp and I. E. Uwah, “Inhibitory Action of Phyllanthus Amarus Extracts on the Corrosion of Mild Steel in Acidic Media,” Corrosion Science, Vol. 21, No. 50, 2008, pp. 2310-2113. doi:10.1016/j.corsci.2008.05.009
[7]	C. Dominkovics and G. Harsanyi, “Fractal Description of Dendrite Growth during Electrochemical Migration,” Journal of Microelectronics Reliability, Vol. 33, No. 48, 2008, pp. 1635-1630.
[8]	S. A. A. EI-Maksoud, “The Effect of Organic Compounds on the Electrochemical Behaviour of Steel in Acidic Media. A review,” International Journal of Electrochemistry, Vol. 18, No. 3, 2008, pp. 535-538.
[9]	D. D. Macdonald, “Reflections on the History of Electrochemical Impedances Pectroscopy,” Journal of Electro Chimical Acta, Vol. 8, No. 51, 2006, pp. 1378-1382.
[10]	Chinese Society for Corrosion and Protection Society, “Electrochemical Corrosion Research Methods,” Chemical Industry Press, China, Vol. 4, No. 4, 1998, pp. 78-80.
[11]	S.-Z. Zheng, “The Application Guide Recycled Cooling Water Quality and Water Treatment Standards,” Chemical Industry Press of Beijing, Beijing, Vol. 12, No. 2, 2003, pp. 156-158.
[12]	C. A. C. Souza, et al., “Influence of Corrosion and Partial Crystallization on Corrosion Resistance of Fe-M-B-Cu (M=Zr,Nb,Mo) Alloys,” Journal of Non-Crystalline Solids, Vol. 22, No. 273, 2000, pp. 281-284.
[13]	S. Mato, G. Alcata, et al., “Corrosion Behavior of a Ti-Base Nanostructure-Dendrite Composite,” Journal of Electrochimical Acta, Vol. 18, No. 50, 2005, pp. 2461-2462. doi:10.1016/j.electacta.2004.10.071
[14]	A. E. Mattel and M. Calvin, “Metal Chelate Chemistry,” Science Industry Press of Beijing, Beijing, 1964, pp. 55-110.
[15]	J. Zhang, Z. P. Li, W. M. Zhao, W. Y. Guo and Y. Wang, “Acta Petrolei Sinica,” Journal of Petroleum Processing Section, Vol. 21, No. 24, 2008, pp. 995-998.