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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

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

  AUTHORS: Defang Zeng, Wei Zhang

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

  JOURNAL NAME: Journal of Water Resource and Protection, Vol.4 No.7, June 18, 2012

  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.