| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Coatings and Surface Engineering for Environmental Protection
|
| Presentation Title |
C-7: Mechanistic Understanding of Corrosion-inhibition in Graphene/Polyetherimide Nanocomposites: From Tortuosity to Galvanic Corrosion |
| Author(s) |
Rachel D. Davidson, Sarbajit Banerjee |
| On-Site Speaker (Planned) |
Rachel D. Davidson |
| Abstract Scope |
Transitioning to aluminum-based automotive components is imperative to meet the increasingly stringent weight targets required to reduce fuel consumption in the automotive industry. Chromium-based coatings provide excellent corrosion protection of high-strength aluminum alloys, but are carcinogenic and toxic to the environment. There is thus a strong unmet need for sustainable technologies that can provide long-term corrosion protection of engineered aluminum alloys. In this work, we develop mechanistic understanding of the corrosion inhibition endowed by polyetherimide/graphene coatings with varying graphene content. Graphene/polyamic acid coatings are formed by in situ condensation of aromatic dianhydrides with diamines followed by imidization on the substrate to obtain the graphene/polyetherimide nanocomposite. At low loadings, we demonstrate excellent long-term corrosion inhibition derived from well-dispersed graphene inclusions that provide extended tortuous pathways for the diffusion of corrosive species. However, higher graphene loadings result in formation of a percolative network, which brings about accelerated galvanic corrosion. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |