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) |
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1600°F (871°C) / 500 hours |
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Metal Loss, |
Average Depth of Attack |
Max. Depth of Attack |
| Alloy |
% Cobalt |
Mils |
(mm) |
Mils |
(mm) |
Mils |
(mm) |
|
| alloy 6B |
57 |
0.3 |
(0.008) |
3.1 |
(0.08) |
3.3 |
(0.08) |
| HR-160 alloy |
30 |
0.2 |
(0.005) |
4.7 |
(0.12) |
5.2 |
(0.13) |
| alloy 25 |
51 |
4.1 |
(0.10) |
8.4 |
(0.21) |
14.6 |
(0.37) |
| alloy 188 |
39 |
7.6 |
(0.10) |
14.9 |
(0.38) |
23.6 |
(0.60) |
| alloy 150 |
50 |
10.3 |
(0.26) |
22.1 |
(0.56) |
28.3 |
(0.72) |
| 556 alloy |
18 |
20.6 |
(0.52) |
31.9 |
(0.81) |
35.6 |
(0.90) |
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Note: 1) Nickel alloys (e.g. 600, 601) consumed in 215 hours (0.044-inch thick samples)
2) 310SS suffered 14 mils of attack in 215 hours
3) 800H suffered 19 mils of attack in 215 hours |
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H2-46%CO-0.8%CO2-1.7%H2S |
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Total Depth of Attack |
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|
|
1100°F |
(593°C) |
1300°F |
(704°C) |
| Alloy |
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) |
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Note: HR-160 alloy exhibited about 1.0 mg/cm2 of weight gain after 1000 hours of expsoure.
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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. |
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