Electrochemical study of tailored sol-gel thin films as pre-treatment prior to organic coating for AZ91 magnesium alloy
The 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...
| Autores: | , , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versión enviada para evaluación y publicación |
| Data de publicação: | 2010 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositório: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/114611 |
| Acesso em linha: | http://hdl.handle.net/10261/114611 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Local electrochemical impedance spectroscopy (LEIS) Electrochemical impedance spectroscopy (EIS) Corrosion inhibitors Cerium-doped coatings Hybrid coatings Sol–gel coatings |
| Resumo: | The 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. |
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