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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.
Highlights
Circulating cooling water system is a commonly used instrument in industry
The surface morphology of the carbon steel was studied by scanning electronic microscope (SEM)
Corrosion crystal morphology on the surface of carbon steel was observed by scanning electronic microscope (SEM)
Summary
Circulating cooling water system is a commonly used instrument in industry. Two of the main operating problems of the cooling water system are corrosion and scale because of the electrochemical oxidation reduction reaction and the metal salt sediments on the metal surface [1]. Industrial requirements for chemical compounds refer to their efficacy but to safety as well The requisites for these compounds should focus on the non-mutagenic, non-carcinogenic products with characteristics more environmentally acceptable than systems currently in use [12]. Of sodium gluconate as an effective non-toxic corrosion and scale inhibitor for ordinary mild steel in simulated cooling water [15]. Gluconate and gluconic acid as well as sodium, calcium and zinc salts of gluconic acid are reported as successful inhibitors against corrosion of tin, iron and mild steel in near neutral media and in simulated cooling water [16]. A multi-component phosphate-free corrosion and scale inhibitor has been prepared by sodium gluconate, hydrolyzed polymaleic anhydride (HPMA), Zn2+ synergist and sulfamic acid. The mechanism of corrosion and scale inhibition was preliminarily investigated by corrosion electrochemistry test [17]
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