Abstract
The effect of grain refinement on corrosion resistance of alloy 690 was investigated. The electron work function value of coarse grained alloy 690 was higher than that of nano/ultrafine grained one. The grain refinement reduced the electron work function of alloy 690. The passive films formed on coarse grained and nano/ultrafine grained alloy 690 in borate buffer solution were studied by potentiodynamic curves and electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. The results showed that the grain refinement improved corrosion resistance of alloy 690. This was attributed to the fact that grain refinement promoted the enrichment of Cr 2 O 3 and inhibited Cr(OH) 3 in the passive film. More Cr 2 O 3 in passive film could significantly improve the corrosion resistance of the nano/ultrafine grained alloy 690.
| Original language | English |
|---|---|
| Pages (from-to) | 403-408 |
| Number of pages | 6 |
| Journal | Applied Surface Science |
| Volume | 360 |
| DOIs | |
| Publication status | Published - 2016 Jan 1 |
Keywords
- Alloy 690
- EIS
- Passive films
- X-ray photoelectron spectroscopy
- XRD
ASJC Scopus subject areas
- Chemistry(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Surfaces, Coatings and Films