About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Hybrid Organic-Inorganic Materials for Alternative Energy
|
| Presentation Title |
Anticorrosive hybrid glass coatings for protection of AZ31B magnesium alloy in alkaline media |
| Author(s) |
Andrei Jitianu, Mario Aparicio, Jadra Mosa, Patrick Garana, Helen Yousaf, Mihaela Jitianu, Lisa C. Klein |
| On-Site Speaker (Planned) |
Andrei Jitianu |
| Abstract Scope |
Magnesium alloys are attractive for automotive and airspace industry. In the last years it was demonstrated that hybrid glasses are usable to protect AZ31B against corrosion. Yet, hybrid glasses are silica-based coatings which cannot be employed in basic media due to formation of silicates that damage the anticorrosive coatings. Here we report for first time the preparation of a series of corrosion resistant hybrid glasses coatings in alkaline media, obtained using methyltrimethoxysilane and cyclohexylmethyldimethoxysilane The mol% composition was between 50mol% MTMS-50mol% CHMDMS and 70mol% MTMS -30mol% CHMDMS. The thermal behavior was investigated using TG-DTA and DSC, while the rheological properties were monitored by oscillatory rheometry. TG-DTA show a two-step decomposition, while DSC shows glass transition temperatures between -61.6oC and -14.8oC, confirmed by the rheological studies. Electrochemical analysis (OCV, EIS and Polarization) in 8M KOH solution shows a stable system combining metal passivation with the barrier functionality provided by the coatings. |