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Título

Electrochemical study of tailored sol-gel thin films as pre-treatment prior to organic coating for AZ91 magnesium alloy

AutorBarranco, Violeta ; Carmona, N. ; Galván Sierra, Juan Carlos; Grobelny, M.; Kwiatkowski, L.; Villegas Broncano, María Ángeles
Palabras claveLocal electrochemical impedance spectroscopy (LEIS)
Electrochemical impedance spectroscopy (EIS)
Corrosion inhibitor
Cerium-doped coatings
Hybrid coatings
Sol–gel coatings
Fecha de publicación2010
EditorElsevier
CitaciónProgress in Organic Coatings 68: 347-355 (2010)
ResumenThe behaviour/resistance of four optimised sol-gel coating systems (inorganic, hybrid organic-inorganic, containing zirconium ions and containing cerium ions) against corrosion of AZ91 magnesium alloy were studied. The coatings obtained by the sol-gel process were evaluated as autonomous protective coatings as well as a pre-treatment prior to acrylic top coat. The coating obtained from tetramethoxysilane (TMOS) and diethoxydimethylsilane (DEDMS) as precursors and doped with Ce3+ was especially effective as pre-treatment for a final acrylic coating. For non-defected coating the impedance modulus has not changed during the time of immersion (7 days) in 0.5 M Na2SO4. An inhibition of coating delamination at the defect of the acrylic coating was recorded by means of LEIS. © 2010 Elsevier B.V. All rights reserved.
URIhttp://hdl.handle.net/10261/114611
DOI10.1016/j.porgcoat.2010.02.009
Identificadoresdoi: 10.1016/j.porgcoat.2010.02.009
issn: 0300-9440
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