Corrosion mitigation of rare-earth metals containing magnesiumEV31A-T6 alloy via chrome-free conversion coating treatment

Abstract:

Magnesium alloys posses unique mechanical and physical characteristics making them attractive light-weight materials for several strategic industries such as electronics, computer, automotive and aerospace.Due to their high chemical reactivity and poor corrosion resistance, the protection of magnesium alloysfrom corrosion is one of the hottest topics in materials science and engineering. Addition of rare-earthmetals (RE) as alloying elements to magnesium alloys is one of the common approaches to improvetheir mechanical properties and, sometimes, the corrosion resistance. However, the potential differencebetween the RE metals phase formed in the Mg matrix enhances the galvanic corrosion at the interfaceswhere RE metals inert phase acts as cathode and the active Mg matrix acts as anode. This paper introducesa simple one-step clean conversion coating treatment for improving the protection of RE containingmagnesium EV31A-T6 alloy in Cl-media. © 2013 Elsevier Ltd. All rights reserved.

Año de publicación:

2013

Keywords:

• V31
• E
• Rare-earth metals
• Stannate conversion coatings
• A-T6 magnesium alloy
• CORROSIÓN
• Advanced materials
• Protective coatings

Fuente:

scopus