Local electrochemical evaluation of a self-healing coating based on encapsulated healing-agent
conference paper
In this work local electrochemical techniques are introduced as powerful and complementary techniques for the in-situ evaluation of self-healing systems applied for the protection of metals against corrosion. Scanning vibrating electrode technique (SVET) and scanning electrochemical microscopy (SECM) are employed for the evaluation of coatings with encapsulated self-healing agents for the protection of aluminum alloys. SVET measurements allowed to in-situ monitor the corrosion processes taking place within a coating defect during immersion in chloride solution. Furthermore, SECM operating in redox competition mode allowed to monitor the evolution of the cathodic process at the defect which is the reduction of dissolved oxygen in solution. SVET and SECM results showed that the release of healing agent from the broken capsules during the damaging of the surface indeed leads to a hindering of the corrosion processes and therefore provide an effective protection of the metallic surface.
TNO Identifier
465255
ISBN
9781618393630
Source title
18th International Corrosion Congress 2011, 20-24 November 2011, Perth, WA., Australia
Pages
408-413
Files
To receive the publication files, please send an e-mail request to TNO Repository.