Tri-Sodium Citrate as Corrosion and Scale Inhibitor of Mild Steel in Synthetic Cooling Water System

Abstract

In this study, scale inhibition performance Trisodium citrate (TSC) was studied using static scale inhibition method, and its corrosion inhibition performance was also investigated by weight loss method and electrochemical measurement. Result showed that TSC could form a layer of corrosion and scale produTSC on mild steel surface in synthetic cooling water. Its inhibition increases with concentration and reaches a maximum of 89% and 95% at 10-3 M for corrosion and scale, respectively. It is noted that TSC takes its inhibition at high temperature and act by physic-sorption process. It is found that the TSC obey to the Langmuir isotherm. Scanning electron microscopy (SEM) showed that TSC inhibits the scale and corrosion by the formation of a protective layer on the mild steel surface.