| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Coatings and Surface Engineering for Environmental Protection
|
| Presentation Title |
Investigation of Self-healing Properties of Cerium-based Conversion Coatings on Mg Alloys |
| Author(s) |
Brent Williams, Lamia Nahar, Diana Shirley Galeano-Osorio, Carlos E. Castano Londono |
| On-Site Speaker (Planned) |
Carlos E. Castano Londono |
| Abstract Scope |
AZ31B Mg alloys protected by cerium-based conversion coatings (CeCCs) were subjected to different electrochemical tests to evaluate the self-healing properties of cerium species. For this purpose, Electrochemical Impedance Spectroscopy and Cyclic Potentiodynamic Polarization tests were carried out in various concentrations of NaCl solutions. The presence of CeCCs improved the resistance to corrosion of AZ31B Mg alloys. Besides barrier protection, self-healing was confirmed with the observations carried out by electron microscopy. The width of the cracks of the as-deposited CeCCs decreased with the increase of NaCl concentration. The evolution of the chemical states of the surfaces was studied with X-ray photoelectron spectroscopy confirming new species formed in the cracks. The morphological and chemical results were correlated with the electrochemical changes and a self-healing mechanism is proposed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |