About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Advanced Coatings for Wear and Corrosion Protection
|
Presentation Title |
Optimization of the Microstructure and Performance of Aluminum Alloy Cold Spray Coatings on Magnesium Alloy Substrates |
Author(s) |
Sridhar Niverty, Rajib Kalsar, Anthony Naccarelli, Timothy Eden, Vineet V Joshi |
On-Site Speaker (Planned) |
Sridhar Niverty |
Abstract Scope |
The widespread implementation of Magnesium alloys for the automotive industry warrants an improvement in their corrosion performance and their ability to withstand dissimilar material contact under corrosive environments. Solid-phase coating methods offer opportunities to precisely tune the coating microstructure, thickness, and coating-substrate interface. We report on the optimization and characterization of cold spray deposited AA6061 aluminum alloy coatings on AZ91 Magnesium alloy substrates. Coatings with low porosity, high thickness and hardness were achieved through the use of bond coating composed of pre-treated CP-Al powders. The dynamic nature of the cold spray process enabled the formation of a metallurgical bond at the coating-substrate interface, leading to high adhesion strengths. Lastly, the substantial improvement in corrosion performance of the coatings was evaluated over multiple length scales using in situ electrochemical characterization methods and correlative microscopy. |