Corrosion behaviour of friction stir processed Al–Mg <sub>2</sub> Si composites
Ali Moharami, A. Razaghian
Abstract
This study aimed to apply the multi-pass friction stir processing (FSP) to Al–25Mg 2 Si as-cast composite in some optimised conditions. Also, microstructural modification effects were assessed on the corrosion behaviour of composite in a 3.5-wt-% NaCl solution. The corrosion resistance of the FSPed composites enhanced as the number of passes increased from 1 to 3. The grain refinement of the Al matrix, uniform distribution of Mg 2 Si particles, reduction in solidification-induced porosities, and deeper penetration of surface Mg 2 Si particles improved stability and adhesion of the passive oxide layer, which prohibited the galvanic/pitting corrosion and diminished the corrosion rate.
Topics & Concepts
Friction stir processingMaterials scienceCorrosionComposite numberComposite materialMetallurgyPenetration (warfare)Galvanic corrosionPitting corrosionOxideGalvanic cellAluminiumOperations researchEngineeringAluminum Alloys Composites PropertiesAdvanced Welding Techniques AnalysisAluminum Alloy Microstructure Properties