The paper presents the results of investigation of polyvinyl zinc-rich coating exposed to 97% relativehumidity atmosphere for 40 days. Condition of the coating and evolution of its protective properties weredetermined with the novel AFM-based approach capable of providing surface profiles, local dc currentmaps as well as local impedance spectra. The proposed technique allowed insight into the local changesof coating topography and electrical properties accompanying a transition from purely electrochemicalto barrier mechanism of protection. The AFM-based approach made it possible to assess what fraction ofthe coating surface was covered with non-conductive zinc corrosion products at given stage of exposureand what the advance of transition between particular protection mechanisms was. The results providedadditional, complimentary information as compared to the global averaging techniques such as classicalelectrochemical impedance spectroscopy and electrochemical potential measurements.
Authors
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1016/j.porgcoat.2016.02.006
- Category
- Publikacja w czasopiśmie
- Type
- artykuł w czasopiśmie wyróżnionym w JCR
- Language
- angielski
- Publication year
- 2016
