The anomalous alkalinization of the electrolyte during a slight anodic polarization of Mg: A different perspective. (1st March 2023)

• Record Type: Journal Article
• Authors: Ortiz-Ozuna, A.; Godínez, F.A.; Genesca, J.; Montoya, R.
• Is Part Of: Electrochimica acta. Volume 443(2023)
• Publication Date: 2023-03-01
• Subjects: Magnesium -- Polarization -- Galvanic corrosion -- Anodic polarization -- Alkaline corrosion -- Anodic dissolution; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2023.141969
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: To better understand several phenomena during the anodic polarization of Mg, a gel electrolyte (doped with phenolphthalein) was used to avoid the strong convective effects produced by H 2 evolution and reveal alkaline zones. Such a methodology is not new but is rarely used and this article does provide new insights about the Mg dissolution, when it is galvanically coupled to A A 7075 . It has been possible to show that the OH − ions generated during the Mg dissolution are locally neutralized into the electrolyte. On the other hand, the place (and its exceptional characteristics) where the Mg(OH) 2 compound is generated during the anodic dissolution of Mg was accurately identified.