Study on a Novel Composite Eco-Friendly Corrosion and Scale Inhibitor for Steel Surface in Simulated Cooling Water

Defang Zeng, Wen Qin

School of Resource and Environmental Engineering, Wuhan University of Technology, Hubei Key Laboratory of Mineral Resources Processing and Environment; Wuhan, P.R. China.

DOI: 10.4236/jsemat.2012.23022                

Abstract

The use of organophosphorus inhibitor is diminishing because of its toxic effects on aquatic and other life. In this study, a composite eco-friendly phosphate-free corrosion and scale inhibitor HS has been developed using hydrolyzed polymaleic anhydride (HPMA), sodium gluconate, Zn²⁺ synergist and sulfamic acid. And the formula ratio of each component is 9:5:4:2. The performance of the corrosion and scale inhibitor was evaluated by weight loss experiment and the static scale inhibition test, respectively. The results indicated that HS had positive corrosion and scale inhibition effect at a dosage of 40 mg.L^–1 or higher. Potentiodynamic polarization curves indicated that HS inhibits the corrosion of steel based on controlling the anodic reaction. And the surface morphology of the carbon steel was studied by scan-ning electronic microscope (SEM). The inhibition effects were due to the formation of protective films.

Keywords

Corrosion and Scale Inhibitor; Steel; Cooling System

Conflicts of Interest

The authors declare no conflicts of interest.

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