| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Functional and Structural Thin Films and Coatings
|
| Presentation Title |
Application of Mg/Al2O3 and Mg/SiO2 Nanolaminates for Uniform and Controlled Corrosion of Biodegradable Implants |
| Author(s) |
Pratap N. Deshmukh, Sudheer Neralla, Jagannathan Sankar, Sergey Yarmolenko |
| On-Site Speaker (Planned) |
Pratap N. Deshmukh |
| Abstract Scope |
Degradable thin films are found to be effective for controlling corrosion of biodegradable implant materials. We have shown that uniform corrosion of magnesium alloy substrates can be achieved by depositing slow-degrading water-permeable Mg/MeOx nanolaminates. In this study, model Mg/Al2O3 and Mg/SiO2 nanolaminates, with bilayer thickness varying from 20 to 100 nm, were deposited on glass substrates using magnetron sputtering techniques at room temperature. These coatings degrade through formation and growth of pores in magnesium layers resulted in reaction of Mg with water penetrating through defects in oxide layers. Applicability of these nanolaminates for controlling degradation was studied by immersion of the samples in different concentrations of saline and measuring pore growth rate at 37°C using optical microscopy. Effect of oxide layer thickness, saline flow rate and sputtering deposition parameters on pore density and corrosion rate was investigated. It was found that nanolaminate degradation time is proportional to number of bilayers. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Magnesium, Surface Modification and Coatings |