Communication—An Approach to Measuring Local Electrochemical Impedance for Monitoring Cathodic Disbondment of Coatings. Issue 5 (1st January 2016)

• Record Type: Journal Article
• Authors: Mahdavi, Fariba; Tan, Mike Yongjun; Forsyth, Maria
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 5(2016)
• Page Start: C228
• Page End: C231
• Publication Date: 2016-01-01
• Subjects: coating disbondment -- electrochemical impedance -- electrochemical measurement -- localised corrosion -- the wire beam electrode; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1101605jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : An electrochemically integrated multi-electrode array has been used for monitoring and visualizing the cathodic disbondment of defective coatings by measuring local electrochemical impedance. Compared with the conventional electrochemical impedance and local current measurement approaches, this new approach significantly enhances the sensitivity of detecting the propagation of coating disbondment by eliminating the effects of the dominating low impedance regions, such as those that arise at coating defects, and thus increases the visibility of higher impedance regions deep in the disbonded coating. Furthermore, it facilitates the probing of electrode processes and mechanisms in selected local electrode regions.