Effects of Polymer-Polymer Complexes on the Corrosion of Mild Steel in Cooling Water System (Part 4)

One Consideration for Behavior of Corrosion Inhibition in a Solution with High Concentration of Ionic Species

Abstract

To clarify a complicating behavior of corrosion inhibition in a solution with high concentration of ionic species (HC solution) in cooling water system, the relationship between corrosion rate of mild steel, amount of polymer adsorption and amount of scale deposition was analyzed by using the polymer-polymer complexes (PPCs). The corrosion rate in a HC solution was dependent on the amount of polymer adsorption and the amount of scale deposition. It was corroborated that the corrosion rate was related to the amount of apparent polymer adsorption determined by equation (5) reported previously in ref. 21): In particular, the physical significance of coefficient A in equation (5) was made clear. And then, it suggested that the corrosion rate in this experimental condition was anticipated by polymer adsorption and scale deposition tests in a short term apart from corrosion weight loss test in a long term.