|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Surface Engineering IV
||Corrosion-resistant Yet Sacrificial Metallic Coatings with an Ability to Release Inhibitor on Demand
||C.S. Witharamage, M. Alrizqi, A. Darwish, A. Nieto, Rajeev K. Gupta
|On-Site Speaker (Planned)
||Rajeev K. Gupta
We present highly corrosion-resistant yet sacrificial metallic coatings- two attributes that do not usually go hand in hand. The coating is a supersaturated solid solution of Al with corrosion-resistant alloying elements and was applied on commercial aluminum alloy AA2024-T3 using cold spray. The microstructure and composition of coatings are engineered to achieve high pitting potential and low corrosion current density along with a corrosion potential less noble than that of the substrate. This means that in any event of coating breakdown, the coating would corrode and prevent the substrate from corrosion. Alloy composition is chosen such that corrosion of coating releases chemical species that could inhibit corrosion by decreasing the cathodic efficiency of the substrate. The characteristics of the coatings can be controlled by changing the composition and microstructure of the metallic coating. We will present the corrosion behavior of coated specimens and corrosion mechanisms as investigated using a combination of advanced electrochemical and analytical techniques.