Inhibiting corrosion effect of Phosphate glass on mild steel in acid solution

摘要

A new corrosion inhibitor, namely glass of composition 50%K₂O-25%CaO-25%P₂O₅ has been synthesized and its inhibiting action on the corrosion of mild steel in molar hydrochloric acid (1 M HCl) has been investigated using electrochemical impedance spectroscopy method (EIS). Data obtained from EIS measurements were analyzed to model the corrosion inhibition process through appropriate equivalent circuit model. The experimental results revealed that Phosphate glass is an efficient inhibitor and the inhibition efficiency increases with increase in inhibitor concentration, reaching value up to 93% at a concentration of 500 ppm. The inhibition mechanism of the studied glass system was discussed in details.