Although not specifically designed for use in applications which require resistance to aqueous corrosion, 242® alloy does exhibit resistance in some media which compares favorably with that exhibited by traditional corrosion-resistant alloys. Data shown for 242® alloy was generated for samples tested in the mill annealed condition.
| Corrosive Media |
Temperature |
Exposure
|
Corrosion Rate, Mils/year (mm/year)
|
| 242® |
B-2 |
C-22®
|
N
|
| - |
°F |
°C
|
h
|
mils
|
mm
|
mils
|
mm
|
mils
|
mm
|
mils
|
mm
|
| 5% HF |
175
|
79 |
24 |
14 |
0.36 |
12 |
0.30 |
25 |
0.64 |
20 |
0.51 |
| 48% HF |
175
|
79 |
24 |
32 |
0.81 |
25 |
0.64 |
27 |
0.69 |
31 |
0.79 |
| 70% HF |
125
|
52 |
24 |
35 |
0.89 |
66 |
1.68 |
32 |
0.81 |
48 |
1.22 |
| 10% HCI |
Boiling
|
24 |
22 |
0.56 |
7 |
0.18 |
400 |
10.16 |
204 |
5.18 |
| 20% HCl |
Boiling
|
24 |
41 |
1.04 |
15 |
0.38 |
380 |
9.65 |
- |
- |
| 55% H3PO4 |
Boiling
|
24 |
3 |
0.08 |
4 |
0.10 |
9 |
0.23 |
- |
- |
| 85% H3PO4 |
Boiling
|
24 |
4 |
0.10 |
4 |
0.10 |
120 |
3.05 |
- |
- |
| 10% H2PO4 |
Boiling
|
24 |
2 |
0.05 |
2 |
0.05 |
11 |
0.28 |
46 |
1.17 |
| 50% H2PO4 |
Boiling
|
24 |
5 |
0.13 |
1 |
0.03 |
390 |
9.91 |
- |
- |
| 99% ACETIC |
Boiling
|
24 |
<1 |
<0.03 |
1 |
0.03 |
- |
Nil |
- |
- |