The formulation consisting of 300ppm 1‐hydroxyethane‐1, 1‐diphosphonic acid (HEDP), 50ppm polyacrylamide (PAA) and 50 ppm Zn 2+ offered 99 per cent corrosion inhibition and 99 to 99.9 per cent biocidal inhibition to mild steel in neutral aqueous environment containing 60ppm Cl‐ , a situation commonly encountered in cooling water systems. The nature of the protective film formed on the metal surface was analysed using X‐ray diffraction, UV‐visible reflectance, FTIR and luminescence spectra. The film was found to be luminescent and to consist of Fe 2+ ‐HEDP complex, Fe 2+ ‐PAA complex and Zn(OH) 2 .
Anti-Corrosion Methods and Materials – Emerald Publishing
Published: Aug 1, 1998
Keywords: Corrosion inhibitors; Steel
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