Resumo

KUNST, Sandra R; MATOS, José F; LEAL DA SILVA, Elen A  e  MALFATTI, Célia F. Surface Treatment of Galvanized Steel with Hybrid Films formed by 3-(trimethoxysilyl) methacrylate (TMSPMA) and Tetraethoxysilane (TEOS). Inf. tecnol. [online]. 2012, vol.23, n.1, pp. 89-98. ISSN 0718-0764.  doi: 10.4067/S0718-07642012000100010.

Galvanized steel was coated with a hybrid film obtained from a solution formed by silane precursor 3-(trimethoxysilyl) methacrylate (TMSPMA) and tetraethoxysilane (TEOS) with addition of cerium. The use of hybrid organic-inorganic layers represents an environmentally friendly alternative to improve resistance against corrosion of a series of metallic materials. Three immersion times (2, 10 and 15 minutes) were used and the films were characterized by scanning electron microscope evaluating film wetability was at the same time. The electrochemical behavior of the coatings obtained was evaluated by open circuit potential, potentiodynamic polarization and electrochemical impedance. The results showed the effect of immersion time in the solution on the film uniformity and consequently on the corrosion resistance of these films.

Palavras-chave : silane; immersion time; corrosion; TMSPMA; TEOS.