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

Authors

  • A. Ghanbari Polymer Engineering and Color Technology Department, Amirkabir University of Technology
  • M. M. Attar Department of Polymer Engineering and Color Technology , Amirkabir University of Technology
  • M. Mahdavian Department of Surface Coating and Corrosion, Institute for Color Science and Technology
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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Journal title

volume 2  issue 2

pages  115- 122

publication date 2009-08-01

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