| About this Abstract |
| Meeting |
Materials Science & Technology 2012
|
| Symposium
|
Surface Protection for Enhanced Materials Performance: Science, Technology and Applications
|
| Presentation Title |
Effectiveness of Trending Citric Acid Passivation vs. Nitric Acid Passivation on CoCrMo |
| Author(s) |
Sophie Xiaofan Yang, Bernice Aboud |
| On-Site Speaker (Planned) |
Sophie Xiaofan Yang |
| Abstract Scope |
Both citric acid (CA) passivation and nitric acid (NA) passivation are widely used in the medical device industry. To evaluate effectiveness of trending CA passivation vs. NA passivation on CoCrMo, 2 factor- 2 level Design of Experiments based on ASTM A 967 was designed to challenge acid concentration and temperature. XPS analysis showed chromium oxide, a corrosion inhibitor, in the passive film increased 20 at% after CA or NA passivation. XPS depth profile showed a thicker passive film after NA passivation compared to CA passivation. ICP-MS analysis showed lower ion release from CoCrMo by 30 wt% after NA passivation, while the alloy subjected to CA passivation showed <10 wt% reduction. The roles of citric acid and nitric acid in passivation are also discussed. |
| Proceedings Inclusion? |
Undecided |