Characterisation of passive films on 300 series stainless steels
| Autor: | T.L. Sudesh L. Wijesinghe, Daniel John Blackwood |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Photocurrent
Austenite Materials science Metallurgy Spinel Passivity Oxide General Physics and Astronomy chemistry.chemical_element Surfaces and Interfaces General Chemistry engineering.material Condensed Matter Physics Surfaces Coatings and Films symbols.namesake chemistry.chemical_compound chemistry engineering symbols Boron Spectroscopy Raman spectroscopy |
| Zdroj: | Applied Surface Science. 253:1006-1009 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2006.03.081 |
| Popis: | The formation and breakdown of the passive films on stainless steels are mainly controlled by ionic and electronic transport processes. Both these processes are in part controlled by the electronic properties of the oxide film. Consequently, it is vital to gain a detailed perception of the electronic properties of the passive films together with structural and compositional information for a comprehensive understanding of mechanisms behind passivity and localised corrosion. As a step towards this goal the passive films formed on two main austenitic stainless steels AISI 316L and AISI 304L in borate solution were characterised by in situ Raman spectroscopy and photocurrent spectroscopy coupled with electrochemical measurements. This revealed the formation of an Fe-Cr spinel as the dominant constituent in the passive films with more Cr enrichment in the oxide film on 316L than that of 304L. Bandgap readings and semiconductivities of the two stainless steels suggested that three different applied potential regions existed; 800 mV(SCE) to 300 mV(SCE), 200 mV(SCE) to −300 mV(SCE) and below −500 mV(SCE). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect