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

Chun Chao Chang, Chiung Chi Wang, Chia Wei Wu, Shou Ching Liu, Fu Der Mai

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1531-1533
Number of pages3
JournalApplied Surface Science
Volume255
Issue number4
DOIs
Publication statusPublished - Dec 15 2008

Keywords

  • Cerium
  • Corrosion protection
  • EIS
  • Green aluminum
  • Silicate
  • ToF-SIMS
  • Zirconium

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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