Abstract
The effects of chromium addition on the corrosion resistance of low alloy steels containing copper in FGD systems, were examined by electrochemical techniques in a sulphuric acid solution containing HCl. All measurements (potentiodynamic polarization test and EIS) reveal an increase in corrosion rate with Cr content, confirming the deterioration of corrosion resistance by Cr addition. EPMA, XPS and SEM examinations of the corroded surface indicated that the addition of chromium increased corrosion damage to the steels by microgalvanic corrosion between a grain as an anode and a grain boundary as a cathode because Cu-containing steel increases the tendency to chromium segregation at grain boundaries.
| Original language | English |
|---|---|
| Pages (from-to) | 7498-7509 |
| Number of pages | 12 |
| Journal | International Journal of Electrochemical Science |
| Volume | 8 |
| Issue number | 6 |
| State | Published - Jun 2013 |
Keywords
- Corrosion
- EIS
- Low-alloy steel
- Polarization
- Sulphuric acid