Review—The Use of Localized Electrochemical Techniques for Corrosion Studies

Abstract

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 inhibition of copper in ferric chloride solutions with organic inhibitors

“…The Volta potential is of electrostatic nature, does not account for chemical interactions, and therefore does not always correlate with the corrosion potential, in particular when the measurements are conducted in "dry" air 50,63 . Yet, it does reflect the tendency of a metal to corrode, and has therefore been used to study localized corrosion, micro-galvanic couples in the microstructure, coating/ paint delamination, and effectiveness of conversion coatings.…”

Scanning Electrochemical Microscopy (SECM) Investigation of 3D Printed Parts Produced by CMT Welding Technology

“…There several reviews have been published about SECM. Some of them concentrate on using the technique in corrosion research [25][26][27][28][29].…”

Effect of anodic dissolution and passivation on X80 steel in NaHCO3 solution

“…Even though this method is widely considered to be sufficiently effective, stray current makes it impossible to pipeline away from corrosion, especially in which there are some defects on coatings. Numerous efforts (Chen et al 2017;Jadhav and Gelling 2019) have been made to investigate the corrosion process of steel, as well as the corrosion products, and stray current is caught more attention due to its surprisingly critical corrosion rate.…”