Colloquium: Dr. Mark B. JensenDepartment of Chemistry Concordia College Moorhead, Minnesota
Applications of Scanning Electrochemical Microscopy in Corrosion and Coatings Studies
Since its development by Bard in the early 1990s, scanning electrochemical microscopy (SECM) has found widespread use in a variety of applications ranging from measurement of heterogeneous and homogeneous kinetics to the imaging of living cells. Work in our own laboratory has focused on the use of SECM in corrosion applications, particularly related to the investigation of conducting polymers for corrosion control of active metals. We have identified cathodically and anodically active areas on aluminum and an aluminum alloy (AA2024-T3), identified nucleation sites of polypyrrole electrodeposition, and measured electron transfer rate constants at regions of varying activity on AA2024-T3. Recently we have used SECM to investigate the mechanisms of corrosion control offered by both lanthanide ions and aluminum flakes coated with doped polypyrrole. This presentation will introduce SECM and give an overview of our work in its application to corrosion science.