Active corroslcn protection Anodl7.ation Sol-gel Cerium glass-like Hybrld sillca coatings F.co-frlendly coatingThis work reports the preparation of an integrated self-healing system that combines the anodization of Al substrates with the deposition of environmentally friendly coatings prepared by sol-gel for obtaining an active corroeion protection of aluminum alloys AA2024. The system consists on a first step of forming appropriate anodized Jayers by controlling the potential and anodizing time. The second step is the infiltration of a cerium sol-gel sol and depoeition of a Ce-glass like film, followed by a final hybrid silica sol-gel coating, creating an adherent, stable and active corrosion protective system. SEM, electrochemical techniques (potentiodynamic and ms tests) as well as an accelerated corroeion test are used to analp,e the structure of the coatings and to study the corrosion behavior of the different coatings on AA2024. The results of potentiodynamic measurements showed the exoellent corroeion properties and ms measurements confirmed the self-healing behavior by blocking the pitting defects. The outstanding self-healing corrosion protecting behavior provided by this in tegrated self-healing coating system offers an efficient chromium-free system for substituting chromium CCC and CCA coatings.
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