Effect of cerium on structure modifications of a hybrid sol-gel coating, its mechanical properties and anti-corrosion behavior

Jean-Baptiste Cambon (1) , Julien Esteban (1) , Florence Ansart (1) , Jean-Pierre Bonino (1) , Viviane Turq (1) , Silvia Helena Santagneli (2) , Celso Valentin Santilli (2) , Sandra Helena Pulcinelli (2)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 UNESP - Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University

An organic-inorganic hybrid coating was developed to improve the corrosion resistance of the aluminum alloy AA 2024-T3. Organic and inorganic coatings derived from glycidoxypropyltrimethoxysilane (GPTMS) and aluminum tri-sec-butoxide Al(OsBu)3, with different cerium contents, were deposited onto aluminum by dip-coating process. Corrosion resistance and mechanical properties were investigated by electrochemical impedance measurements and nano-indentation respectively. An optimal cerium concentration of 0.01 M was evidenced. To correlate and explain the hybrid coating performances in relation to the cerium content, NMR experiments were performed. It has been shown that when the cerium concentration in the hybrid is higher than 0.01 M there are important modifications in the hybrid structure that account for the mechanical properties and anti-corrosion behavior of the sol-gel coating.

Mots clés: Hydrides; Sol-gel chemistry; Nuclear magnetic resonance (NMR); Impedance spectroscopy; Electrochemical properties; Mechanical properties

Domaines: Matériaux

Jean-Baptiste Cambon, Julien Esteban, Florence Ansart, Jean-Pierre Bonino, Viviane Turq, et al.. Effect of cerium on structure modifications of a hybrid sol-gel coating, its mechanical properties and anti-corrosion behavior. Materials Research Bulletin, 2012, vol. 47, pp. 3170-3176. ⟨10.1016/j.materresbull.2012.08.034⟩. ⟨hal-00837994⟩