Retardation of Pitting of Carbon Steel in Concentrated Cooling Water with PO₄^3- (+Zn²⁺) Inhibitors

Abstract

Effectiveness of polymer electrolytes containing PO₄^3- (+Zn²⁺)-type inhibitors on prevention of pitting of carbon steels, both acid pickled and mill scaled, in a variety of concentrated cooling water was investigated. The pitting rate during a month of the test period could be reduced to less than 0.05mm depth by optimizing the concentrations of the polymer electrolyte scale inhibitor and corrosion inhibitor and the quality of cooling water to be used.