Mechanism of inhibition of corrosion of mild steel by polyacrylamide, phenyl phosphonate and Zn²⁺

Abstract

The formulation consisting of 50ppm polyacrylamide (PAA), 300ppm phenyl phosphonic acid (PPA) and 50ppm Zn²⁺ has 95 per cent inhibition efficiency in controlling corrosion of mild steel in a neutral aqueous environment, containing 60ppm Cl^—, a situation commonly encountered in cooling water systems. A discussion of mechanistic aspects of corrosion inhibition is based on the results obtained from a potentiostatic polarization study, UV‐visible, FTIR and luminescence spectra. The protective film is found to be luminescent and to consist of Fe²⁺‐PAA complex, Fe²⁺‐PPA complex and Zn(OH)₂.

Citation

Rajendran, S., Apparao, B.V. and Palaniswamy, N. (1999), "Mechanism of inhibition of corrosion of mild steel by polyacrylamide, phenyl phosphonate and Zn²⁺", Anti-Corrosion Methods and Materials, Vol. 46 No. 2, pp. 111-116. https://doi.org/10.1108/00035599910263288