The efficiency of TiN-TiC bilayer coatings, deposited by ion-beam-assisted deposition on martensitic steel, as a hydrogen permeation barrier was investigated by a gas phase method; the hydrogen permeability in the TiN-TiC bilayers is very low, at least 104times lower than in the steel substrate in the temperature interval 470-570 K. Possible physical mechanisms, responsible for the reduced permeability of the ceramic bilayers, are discussed. In particular, from our experimental results, it can be concluded that chemisorption and/or hydrogen jumping from surface sites to the first subsurface atomic layer represents the hydrogen permeation limiting process.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry
Checchetto, R., Bonelli, M., Gratton, L. M., Miotello, A., Sabbioni, A., Guzman, L., Horino, Y., & Benamati, G. (1996). Analysis of the hydrogen permeation properties of TiN-TiC bilayers deposited on martensitic stainless steel. Surface and Coatings Technology, 83(1-3), 40 - 44. https://doi.org/10.1016/0257-8972(96)02851-4