|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Coatings and Surface Engineering for Environmental Protection II
||Microstructure and Electrochemistry of Al-Rich Primer
||Shanshan Wang, Xi Wang, Siva Palani, Alan Rose, Gerald Frankel
|On-Site Speaker (Planned)
Al-rich primer is designed to be anodic relative to high strength Al alloys, so that it drives the mixed potential of Al alloy substrates (e.g. AA2024) into the cathodic region below the breakdown potentials of the Al alloys, preventing localized corrosion. The Al-rich primer under study is composed of spherical TCP-treated Al-Zn-In pigments in an epoxy binder. The microstructure of the Al-rich primer was studied using a combination of XRM, SEM and TEM techniques. Polarization and EIS tests were conducted to measure the electrochemistry of the Al-Zn-In alloy under neat primer in NaCl solution to simulate the environment which Al-Zn-In pigments are exposed to in the real primer. Galvanic corrosion between the AA2024 substrate and Al-Zn-In bulk alloy was also studied using a ZRA.
||Planned: Supplemental Proceedings volume