Electrochemical study of modified cerium–silane bi-layer on Al alloy 2024-T3

• Published in: Corrosion science Vol. 51; no. 6; pp. 1238 - 1250
• Main Authors: Palomino, Luis M., Suegama, Patrícia H., Aoki, Idalina V., Montemor, M.F., De Melo, Hercílio G.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.06.2009; Elsevier
• Subjects: A. Aluminum; A. organic coatings; A. rare earth elements; Applied sciences; B. AFM; B. EIS; Corrosion; Corrosion environments; Exact sciences and technology; Metals. Metallurgy; Nonmetallic coatings; Production techniques; Surface treatment; B. AFM; A. Aluminum; A. organic coatings; B. EIS; A. rare earth elements; Atomic force microscopy; Lanthanide; Aluminium base alloys; Cerium; Non metal coating; Surface treatment; Corrosion; Impedance; Organic compounds
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2009.03.012

In this paper, the performance of bis-1, 2-(triethoxysilyl) ethane (BTSE) as a pre-treatment to protect the AA 2024-T3 against corrosion has been investigated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves, and the scanning vibrating electrode technique (SVET). The microstructural and morphological characterizations were carried out via scanning electron microscopy and atomic force microscopy and the chemical composition evaluated using contact angle measurements and X-ray photoelectron spectroscopy (XPS). The electrochemical results showed that the additives improved the anticorrosion properties of the coating. The chemical characterization indicated that additives contribute to an increased degree of surface coverage, as well as to a more complete reticulation. The SVET results evidenced the self-healing abilities of Ce ions.