Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/114886
Title: Uses of Scanning Electrochemical Microscopy (SECM) for the Characterization with Spatial and Chemical Resolution of Thin Surface Layers and Coating Systems Applied on Metals: A Review
Authors: Santana Rodríguez, Juan José 
Izquierdo, Javier
Souto, Ricardo M.
UNESCO Clasification: 331005 Ingeniería de procesos
Keywords: Coating Degradation
Corrosion Inhibitor Films
Corrosion Protection
Electrochemical Activity
Microelectrode, et al
Issue Date: 2022
Journal: Coatings 
Abstract: Scanning Electrochemical Microscopy (SECM) is increasingly used in the study and characterization of thin surface films as well as organic and inorganic coatings applied on metals for the collection of spatially-and chemically-resolved information on the localized reactions related to material degradation processes. The movement of a microelectrode (ME) in close proximity to the interface under study allows the application of various experimental procedures that can be classified into amperometric and potentiometric operations depending on either sensing faradaic currents or concentration distributions resulting from the corrosion process. Quantitative analysis can be performed using the ME signal, thus revealing different sample properties and/or the influence of the environment and experimental variables that can be observed on different length scales. In this way, identification of the earlier stages for localized corrosion initiation, the adsorption and formation of inhibitor layers, monitoring of water and specific ions uptake by intact polymeric coatings applied on metals for corrosion protection as well as lixiviation, and detection of coating swelling—which constitutes the earlier stages of blistering—have been successfully achieved. Unfortunately, despite these successful applications of SECM for the characterization of surface layers and coating systems applied on metallic materials, we often find in the scientific literature insufficient or even inadequate description of experimental conditions related to the reliability and reproducibility of SECM data for validation. This review focuses specifically on these features as a continuation of a previous review describing the applications of SECM in this field.
URI: http://hdl.handle.net/10553/114886
ISSN: 2079-6412
DOI: 10.3390/coatings12050637
Source: Coatings [EISSN 2079-6412], v. 12 (5), 637, (Mayo 2022)
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