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

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-th...

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Bibliographic Details
Published in:Journal of applied electrochemistry 2005-05, Vol.35 (5), p.473-478
Main Authors: ABDEL SALAM HAMDY, BECCARIA, Anna Maria
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion prevention
Exact sciences and technology
Metals. Metallurgy
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Summary: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.
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-004-8330-x