Acetylacetonate Complexes as New Corrosion Inhibitors in Phosphoric Acid Media: Inhibition and Synergism Study

Ghanbari, A.; Attar, M. M.; Mahdavian, M.

doi:10.30509/pccc.2009.75755

Acetylacetonate Complexes as New Corrosion Inhibitors in Phosphoric Acid Media: Inhibition and Synergism Study

Authors

¹ Polymer Engineering and Color Technology Department, Amirkabir University of Technology

² Department of Polymer Engineering and Color Technology , Amirkabir University of Technology

³ Department of Surface Coating and Corrosion, Institute for Color Science and Technology

10.30509/pccc.2009.75755

Abstract

The corrosion inhibition performance of acetylacetonate complexes of zinc(II), manganese(II), cobalt(II) and copper(II) on the mild steel substrate in 1M H3PO4 was studied using DC polarization. It was seen that the mentioned complexes decreased corrosion rate of mild steel in phosphoric acid media due to the adsorption on metal surface. The potential of mild steel shifted toward more active potentials. The cathodic Tafel slopes increased showing that acetylacetonate complexes are cathodic inhibitors. Presence of chloride ions in the electrolyte enhanced inhibition performance of acetylacetonate complexes due to synergism. Chloride ions provided by HCl had a better performance compared to NaCl.

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