Effect of Ce(III) and Ce(IV) ions on the structure and active protection of PMMA-silica coatings on AA7075 alloy

• Autor(a) principal: Trentin, A. [UNESP]
• Data de Publicação: 2021
• Outros Autores: Harb, S. V. [UNESP], Uvida, M. C. [UNESP], Marcoen, K., Pulcinelli, S. H. [UNESP], Santilli, C. V. [UNESP], Terryn, H., Hauffman, T., Hammer, P. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.corsci.2021.109581; http://hdl.handle.net/11449/233147
• topic: Aluminium alloy; EIS; Inhibition; Intermetallics; Organic coatings; SIMS

This work investigates the effect of Ce(III) and Ce(IV) additives on the structure and anti-corrosion properties of poly(methyl methacrylate) (PMMA)-silica coatings on AA7075 aluminium alloy. The results revealed that intermediate Ce(IV) loadings (500 and 1000 ppm) result in a dense hybrid network with a less defective polymeric phase, extending the service time of AA7075 up to 835 days in 3.5% NaCl. Although both additives provide long-term protection, the self-healing ability was observed only for Ce(IV) addition, favoured by the formation of oxides/hydroxides at pH∼3. These properties make the 4 μm-thick PMMA-silica-Ce(IV) coatings very interesting for chromium-free protection technologies.