Abstract
The 2101 lean duplex stainless steel has wide potential application in storage, heat exchangers, and in the oil and gas industries. This work investigates the electrochemical behaviour of 2101 duplex stainless steel with an addition of 0.15 wt% ruthenium, using potentiodynamic techniques in 1M H2SO4 at 25°, 40°, 60°, and 80°C. The microstructures of samples were characterized using optical metallography and scanning electron microscopy. The results showed that the ruthenium addition moved the corrosion potential of alloy 2101 to a more positive potential. All samples containing ruthenium displayed longer passive regions at 25°C and 80°C compared to those without ruthenium. Alloys without ruthenium had higher critical current density (icrit) values when compared to the alloys with ruthenium. Ruthenium additions decreased the passive current densities and inhibited anodic dissolution. At room temperature the corrosion rate of alloys with ruthenium was lower than these without ruthenium.
| Original language | English |
|---|---|
| Pages (from-to) | 535-538 |
| Number of pages | 4 |
| Journal | Journal of the Southern African Institute of Mining and Metallurgy |
| Volume | 112 |
| Issue number | 7 |
| Publication status | Published - Jul 2012 |
| Externally published | Yes |
Keywords
- 2101LDX stainless steel
- Corrosion behaviour
- Duplex stainless steels
- Fe-21Cr-1Ni
- Microstructure
- Passivation
- Ruthenium addition
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Metals and Alloys
- Materials Chemistry