Corrosion behavior of 2024 aluminum alloy anodized in presence of permanganate and phosphate ions

Maysam Mohammadi, Ali Yazdani, Mohammad E. Bahrololoom, Akram Alfantazi

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

In this article, the effects of two inorganic corrosion inhibitors, permanganate and phosphate anions, on morphology, composition, thickness, and corrosion resistance of the anodic film formed on 2024 aluminum alloy in sulfuric acid were investigated. Surface morphology of the oxide films were studied by field emission scanning electron microscopy. Electrochemical impedance spectroscopy and potentiodynamic polarization tests were conducted to assess the corrosion resistance of the coatings. These analyses showed that the presence of the mentioned inhibitors changed the coating morphology, especially in the case of phosphate ions. Corrosion results indicated that using inhibitors during the anodizing process increased the corrosion resistance of the anodized samples. The increases were approximately 81% and 97% for 0.05 M of permanganate and phosphate ions, respectively, compared with the anodized coatings in the absence of additives. An increase in the inhibitor concentration results in better corrosion resistance of the aluminum anodic layer.

Original languageBritish English
Pages (from-to)219-229
Number of pages11
JournalJournal of Coatings Technology and Research
Volume10
Issue number2
DOIs
StatePublished - Mar 2013

Keywords

  • Al 2024 alloy
  • Anodic film
  • Corrosion inhibitor
  • Corrosion tests

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