Journal
CORROSION SCIENCE
Volume 189, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109581
Keywords
Organic coatings; Inhibition; Aluminium alloy; Intermetallics; EIS; SIMS
Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [424133/20164, 307905/20187, 421081/20163]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) - INCT National Institute of Science and Technology on Advanced Eco-Efficient Cement-Based Technologies [14/509483, 14/4655933, 001]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2015/119072, 2015/093427, 2014/121829]
- Research Foundation Flanders (FWO)
- Hercules program [ZW13_07]
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The Ce(IV) additives create a dense hybrid network in the PMMA-silica coating, extending the service time of AA7075 aluminum alloy and providing self-healing ability, making it suitable for chromium-free protection technologies.
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 longterm 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 mu m-thick PMMA-silica-Ce(IV) coatings very interesting for chromium-free protection technologies.
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