Journal of Applied Electrochemistry

, Volume 35, Issue 5, pp 473–478 | Cite as

Effect of surface preparation prior to cerium pre-treatment on the corrosion protection performance of aluminum composites

Article
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Abstract

The effect of surface preparation prior to cerium treatment on the corrosion protection of AA6061 T6–10% Al2O3 in NaCl solution was investigated using electrochemical impedance spectroscopy and DC polarization techniques. A new surface preparation method consisted of pre-etching followed by oxide-thickening is proposed. Optical microscope and scanning electron microscopy showed a marked decrease in the number and depth of pits for the pre-etched as compared to the as-polished specimens. X-ray photoelectron spectroscopy revealed that pre-etching eliminated the active sites where the chloride ions can adsorb. Simultaneously, the adsorption of cerium ions is uniformly on the surface. The oxide-thickening step has a vital role in the protection mechanism. It was found that presence of a thick oxide layer completely changed the mechanism of protection.

Keywords

aluminium composite cerium pretreatment corrosion protection EIS surface preparation 
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Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Central Metallurgical R&D InstituteCMRDICairoEgypt
  2. 2.Istituto per la Corrosione Marina dei Metalli – CNRGenovaItaly

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