Using ToF-SIMS and EIS to evaluate green pretreatment reagent: Corrosion protection of aluminum alloy by silica/zirconium/cerium hybrid coating

Increasing environmental concern has led to the restrictive use of chromate conversion coatings to protect Al-alloys from corrosion. Our research is under way to find environmentally compliant substitute coating such as Si/Zr/Ce hybrid coating. The corrosion protection effect of green pretreatment r...

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Bibliographic Details
Published in:Applied surface science 2008-12, Vol.255 (4), p.1531-1533
Main Authors: Chang, Chun-Chao, Wang, Chiung-Chi, Wu, Chia-Wei, Liu, Shou-Ching, Mai, Fu-Der
Format: Article
Language:English
Subjects:
Cerium
Corrosion protection
EIS
Green aluminum
Silicate
ToF-SIMS
Zirconium
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Summary:Increasing environmental concern has led to the restrictive use of chromate conversion coatings to protect Al-alloys from corrosion. Our research is under way to find environmentally compliant substitute coating such as Si/Zr/Ce hybrid coating. The corrosion protection effect of green pretreatment reagent consisted of Si-containing base solution, Ce- and Zr-containing sealing solutions on the corrosion protection of Al-alloys was studied with a 3.5% NaCl aqueous testing solution. The correlation between the corrosion resistance measured by electrochemical impedance spectroscopy (EIS) and surface chemical composition of the hybrid coating measured by time-of-flight secondary ion mass spectroscopy (ToF-SIMS) was studied. The proposed green pretreatment reagent was found improve the corrosion protection of Al-alloys, presumably due to the formation of protective oxide film acting as an oxygen barrier.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2008.05.015