Local alkalisation and corrosion induced by the dissolution of Mg and Mg-based phases: in situ and real-time studies
Abstract
A Mg 2+ ion selective microelectrode (Mg 2+ ISME) and a H + ion selective microelectrode (H + ISME) were used together to simultaneously track local [Mg 2+ ] and pH over different Mg-containing substrates, in 0.1 M NaCl. Substrates included pure Mg, magnesium silicide (Mg 2 Si), and AA6061 containing Mg 2 Si surface particles. Measurements made with H + ISMEs revealed that dissolution of Mg leads to significant local alkalisation, with local pH trending toward the equilibrium pH associated with Mg(OH) 2 precipitation. It was identified that such local alkalisation causes second-order effects, including dissolution of Al from the matrix in AA6061, and passivation of Mg by formation of protective Mg-oxides/hydroxides.
Fields of Study & Subjects
Corrosion Behavior and Inhibition
Layered Double Hydroxides Synthesis and Applications
Magnesium Oxide Properties and Applications
Publication details
- Journal / source
- Journal of Electroanalytical Chemistry
- Publisher
- Elsevier BV
- Volume
- 1007
- Pages
- 119932–119932
- Publication date
- 5 February 2026
- Language
- EN