|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Functional and Structural Thin Films and Coatings
||A-5: The Design of Coatings Developed Using Polyetherimide and Nanocomposites Thereof for Corrosion Protection of Base Metals
||Tiffany Sill, Rachel Davidson, Lacey Douglas, Viswanathan Kalyanaraman, Nikhil Verghese, Kapil Sheth, Sarbajit Banerjee
|On-Site Speaker (Planned)
There remain few alternatives to chromium-based coatings for the corrosion protection of aluminum alloys, which are an increasingly popular material for lightweighting of vehicles. Polyetherimide (PEI) polymer-based coatings are an attractive replacement due to their impermeability to water and corrosive species. In this work, PEI was utilized as the continuous phase and the inclusion of exfoliated graphite served to kinetically increase barrier protection via the lengthening of diffusion pathways. Automated spray-coating has allowed for the systematic determination of generalizable heuristics for deposition of pin-hole free polyetherimide nanocomposite films. Mechanisms of corrosion inhibition has been evaluated by monitoring the evolution of electrochemical impedance spectra over the course of 100 days exposure to salt-water solutions. Coupling this data with DC polarization techniques, adhesion testing, and cross-sectional analysis of exposed coatings provides a comprehensive understanding of the mechanisms of corrosion inhibition.
||Surface Modification and Coatings, Composites, Other