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While global electrochemical techniques, such as Electrochemical Impedance Spectroscopy (EIS), have been utilized in corrosion and coatings research for over forty years, the refinement of those techniques into localized methods is a more recent development. In this review, in honor of Hugh Isaacs, the authors have focused on developments in localized methods of importance to corrosion research. Receiving special attention in the review are the following methods: Scanning Vibrating Electrode Technique (SVET), Localized Electrochemical Impedance Spectroscopy (LEIS), Scanning Electrochemical Microscopy (SECM), Scanning Kelvin Probe (SKP), Scanning Ion-Selective Electrode Technique (SIET), and Scanning Droplet Cell (SDC) Technique. For each method, a summary of the method along with several examples of its use in the area of corrosion and coatings are provided. Additionally, synergies with electro-microimaging techniques are discussed which highlights the often complex experimental designs required to probe the mechanisms of corrosion.

Corrosion is of paramount interest to researchers all around the world owing to its disastrous impact on both the economy and people's safety. New strategies based on novel materials have been employed to mitigate corrosion. Conducting polymerbased nanocomposites are a class of materials which have shown promise for corrosion protection. This paper will focus on the specific case of the Conducting polymer-based nanocomposites for corrosion protection, and one important case will be discussed in detail. Corrosion protection offered by Polypyrrole (PPy)/Fe 2 O 3 based composite coating for cold rolled substrate is characterized in this paper by electrochemical impedance spectroscopy and open circuit potential measurements. It was found that PPy/Fe 2 O 3 based composite coating provides better corrosion performance after 40 days exposure to ASTM B117 salt fog test conditions. This improved performance was attributed to the increased surface area of PPy and passivating nature of the composite resulting from the redox activity provided by PPy.

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