SECM Imaging of Interfacial Processes in Defective Organic Coatings Applied on Metallic Substrates Using Oxygen as Redox Mediator
| Autor: | Luis Fernández-Mérida, Ricardo M. Souto, Sergio González |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Materials science
Analytical chemistry chemistry.chemical_element engineering.material Oxygen Analytical Chemistry Corrosion Metal chemistry.chemical_compound Scanning electrochemical microscopy Coating chemistry Chemical engineering visual_art Electrochemistry engineering visual_art.visual_art_medium Degradation (geology) Redox mediator Polyurethane |
| Zdroj: | Electroanalysis. 21:2640-2646 |
| ISSN: | 1521-4109 1040-0397 |
| Popis: | Operation of the SECM in feedback mode over a coated metal allows changes in the state of the surface to be monitored using dissolved oxygen in the test environment as redox mediator. The system investigated consisted in mild steel samples coated with a polyurethane film in which a defect was deliberately introduced into it. Accurate approach curves under negative-feedback condition were obtained using a platinum microelectrode over regions of the intact coating. Imaging experiments were also carried out over the artificial defect on the coating. Under these conditions, corrosion of the exposed metal substrate at the defects could be monitored. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text