High-temperature Corrosion Resistance
Sulfidation in Reducing Atmospheres
Ar - 5%H2 - 5%CO - 1%CO2 - 0.15%H2S (Vol. %) (PO2 = 3 x 10-19 atm, PS2 = 0.9 x 10-6 atm)
| 1600°F (871°C)/500 hours |
| Alloy |
Cobalt |
Metal Loss |
Average Depth of Attack |
Max. Depth of Attack |
| - |
% |
mils |
mm |
mils |
mm |
mils |
mm |
| 6B |
57 |
0.3 |
0.008 |
3.1 |
0.08 |
3.3 |
0.08 |
| HR-160® |
30 |
0.2 |
0.005 |
5.2 |
0.13 |
5.7 |
0.14 |
| 25 |
51 |
4.1 |
0.10 |
8.4 |
0.21 |
14.6 |
0.37 |
| 188 |
39 |
7.6 |
0.10 |
14.9 |
0.38 |
23.6 |
0.60 |
| 150 |
50 |
10.3 |
0.26 |
22.1 |
0.56 |
28.3 |
0.72 |
| 556® |
18 |
20.6 |
0.52 |
31.9 |
0.81 |
35.6 |
0.90 |
Sulfidation in Reducing Atmospheres
H2-46%CO-0.8%CO-1.7%HS
Total Depth Attack |
| Alloy |
1100°F (593°C) |
1300°F (704°C) |
| - |
mpy |
mm/y |
mpy |
mm/y |
| HR-160® |
14.4 |
0.37 |
27.3 |
0.70 |
| 6B |
23.6 |
0.60 |
264.4 |
6.72 |
| 150 |
37.7 |
0.96 |
108.8 |
2.76 |
| 25 |
94.1 |
2.39 |
188.5 |
4.79 |
| 188 |
150.5 |
3.82 |
292.6 |
7.43 |
| 556® |
121.1 |
3.08 |
345.8 |
8.78 |
Sulfate-Induced Sulfidation in Combustion Atmospheres
Laboratory Hot Corrosion Burner Rig Testing - Specimens were exposed to a combustion stream generated in a burner rig fired with No. 2 fuel oil with a constant injection of 50 ppm (by weight) salt (mostly sodium chloride) into the combustion stream. Specimens were also subjected to thermal cycling by cycling them out of the test chamber once every hour and rapid fan cooling to less than 390°F (199°C) for two minutes.
