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SECM Imaging of Interfacial Processes in Defective Organic Coatings Applied on Metallic Substrates Using Oxygen as Redox Mediator
Author(s) -
Souto Ricardo M.,
FernándezMérida Luis,
González Sergio
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200900232
Subject(s) - materials science , redox , coating , oxygen , corrosion , metal , substrate (aquarium) , scanning electrochemical microscopy , platinum , polyurethane , microelectrode , chemical engineering , mediator , nanotechnology , electrochemistry , chemistry , composite material , metallurgy , electrode , organic chemistry , catalysis , medicine , oceanography , geology , engineering
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.