Preparation and characterization of cerium doped silica sol–gel coatings on glass and aluminum substrates

By A. Pepe, M. Aparicio, S. Ceré, A. Durán. 2004

143 citations recorded by the source corpus.

Abstract Chromates are among the most common substances used as corrosion inhibitors. However, these compounds are highly toxic, and an intense effort is being undertaken to replace them. Cerium compounds seem to fulfil the basic requirements for consideration as alternative corrosion inhibitors. The aim of this work was to study the effect of the incorporation of cerium ions in silica sol–gel coatings on aluminum alloys as potential replacement of chromate treatments. The main idea was to combine the ‘barrier’ effect of silica coatings with the ‘corrosion inhibitor’ effect of the cerium inside the coatings. Thin (below 1 μm for a single layer) and transparent cerium doped silica sol–gel coatings were prepared by dipping 3005 aluminum alloys in sol–gel solutions. Ultra-violet–visible spectra (UV–vis) show that cerium ions, Ce 3+ and Ce 4+ , always are present in the coatings, independently of the cerium salt or firing atmosphere used. Active protection with single and two layer coatings prepared with Ce (IV) salt seems to improve corrosion protection of the coated aluminum while coatings prepared with Ce(III) salt only entails a protection when applied as a two layer, possibly due to sealing of pre-existent defects in the first layer. The improvement of active protection with immersion time would imply that corrosion is inhibited by cerium ions that migrate through the coating to the site of the attack (a defect in the coatings) and then react to passivate the site.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/97274c75102187ddaab1589abea44af77ca9d3ce

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1. N. Rosero-Navarro
2. S. Pellice
3. A. Durán
4. M. Aparicio

Citations in the corpus

• Effects of Ce-containing sol–gel coatings reinforced with SiO2 nanoparticles on the protection of AA2024 (2008, background): “Some papers [29–32] describe the partial oxidation of Ce to Ce ions, and the further precipitation of CeO2 through the formation of intermediate species as CeðOHÞ 2 or Ce(OH)3.”