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

作者：Jamali Sina S; Moulton Simon E^*; Tallman Dennis E; Forsyth Maria; Weber Jan; Wallace Gordon G

来源：Corrosion Science, 2014, 86: 93-100.

DOI：10.1016/j.corsci.2014.04.035

• Magnesium
• Electrochemical calculation
• Passive films
• Hydrogen absorption
• Interfaces

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 (H-2) evolution and local pH on a corroding surface of AZ31 in simulated biological fluid (SBF). It was found that the main domains of H-2 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.

• 出版日期2014-9