Applications of scanning electrochemical microscopy (SECM) for local characterization of AZ31 surface during corrosion in a buffered media

Authors

Sina S. Jamali, University of WollongongFollow
Simon E. Moulton, University of WollongongFollow
Dennis E. Tallman, North Dakota State University
Maria Forsyth, Deakin University
Jan Weber, Boston Scientific
Gordon G. Wallace, University of WollongongFollow

RIS ID

90578

Publication Details

Jamali, S. S., Moulton, S. E., Tallman, D. E., Forsyth, M., Weber, J. & Wallace, G. G. (2014). Applications of scanning electrochemical microscopy (SECM) for local characterization of AZ31 surface during corrosion in a buffered media. Corrosion Science, 86 93-100.

Abstract

Different modes of scanning electrochemical mapping (SECM) such as surface generation/tip collection (SG/TC), amperometry, AC-SECM and potentiometry were employed to characterize the active/passive domains, hydrogen gas (H2) evolution and local pH on a corroding surface of AZ31 in simulated biological fluid (SBF). It was found that the main domains of H2 evolution are associated with lower insulating properties of the surface as well as higher local pH. The near surface pH was found to be highly alkaline indicating that, even in a buffered solution such as SBF, the local pH on a corroding AZ31 surface can be significantly different to the bulk pH.