title: Influence of edge effects on local corrosion rate of magnesium alloy/mild steel galvanic couple.
abstract: The effect of the insulator-mixed-material edge on the galvanic corrosion rate of magnesium alloy (AE44)-mild steel (MS) couple is experimentally studied using scanning vibrating electrode technique (SVET), profilometry, and classical electrochemistry. The local and average corrosion rates estimated from the experimental depth of anodic attack profile of AE44-MS couple are validated by 2D and 3D corrosion numerical models. Our study demonstrates experimentally and theoretically that the presence of the insulator edge increases the local current density, which enhances the corrosion rate. The extent of the local corrosion rate enhancement and its effect on the overall corrosion rate of the mixed material is discussed and depends on the mixed material's geometry and the edge type.
authors.affiliation: Laboratory for Electrochemical Reactive Imaging and Detection of Biological Systems, Department of Chemistry, McGill University, Montreal, QC, Canada, H3A 0G4.
authors.forename: Dao
authors.initials: D
authors.lastname: Trinh
authors.forename: Philippe
authors.initials: P
authors.lastname: Dauphin Ducharme
authors.forename: Ushula
authors.initials: U
authors.lastname: Mengesha Tefashe
authors.forename: Joseph R
authors.initials: JR
authors.lastname: Kish
authors.forename: Janine
authors.initials: J
authors.lastname: Mauzeroll