Influence of substituents on the inhibition efficiency of phosphonic acid‐Zn²⁺ systems

Abstract

The inhibition efficiencies of ethyl phosphonic acid (EPA) and 2‐chloroethyl phosphonic acid (2‐Cl EPA) in the presence of Zn²⁺, in controlling the corrosion of mild steel in a neutral aqueous environment containing 60ppm Cl^‐ have been evaluated by weight‐loss method and compared. It is observed that 2‐Cl EPA‐Zn²⁺ system has more inhibition efficiency than an EPA‐Zn²⁺ system. It is due to the electron withdrawing power of the Cl atom and its size. The nature of the protective film formed on the surface of the metal has been analysed by X‐ray diffraction, uv‐visible reflectance and luminescence spectra.

Citation

Rajendran, S., Apparao, B.V. and Palaniswamy, N. (1999), "Influence of substituents on the inhibition efficiency of phosphonic acid‐Zn²⁺ systems", Anti-Corrosion Methods and Materials, Vol. 46 No. 4, pp. 284-289. https://doi.org/10.1108/00035599910273467