0MO28Ni65Fe5(hastelloyb) alloy in alkali and salt
The test shows that the Hastelloy B alloy has a corrosion rate of only 0.050 mm/a at a concentration of ≤70% NaOH and a temperature of ≤120 °C; in 60% NaOH with a boiling point of 165 ° C and 70% NaOH with a boiling point of 190 ° C, The corrosion rate is 0. 55 mm / a. The corrosion rate is 0. 55 mm / a; in a concentration of 0. 55 mm / a.
Table 7-22 Corrosion resistance of Hastelloy B (0Mo28Ni65Fe5) alloy in some organic acids
| medium |
Temperature/℃ |
test hours/h |
corrosion rate/ mm•a1 |
|
Butyric acid + a small amount of |
110 |
32 |
liquid phase0. 1600 |
|
gas phase0. 0625 |
|||
|
(CH3CO2H)2 steam |
200 |
52 |
0. 020 |
|
50% ~80% Lactic acid (in storage tanks) |
63 |
72 |
0. 1075 |
|
80%Lactic acid (in the still) |
180 |
6.5 |
0. 0325 |
| 98%CH3 CO( CH2)2 CO2H (in the tank) |
38 |
57 |
0. 0075 |
| CH3 CO( CH2)2 CO2H(in the still) |
107 |
29 |
0.1575 |
| Oxalic acid, saturated solution |
Boiling |
0.25 |
0. 1175 |
| Crude anhydride vapor |
160 – 287 |
59 |
0. 0075 |
|
50 |
0.38 | ||
|
50%Propionic acid |
75 |
0.1 | |
|
Boiling |
0.05 |
||
|
50 |
0.61 |
||
|
80%Propionic acid |
75 |
0.3 | |
|
Boiling |
0. 13 |
||
|
50 |
0. 15 |
||
|
99%propionic acid |
75 |
0.64 |
|
|
Boiling |
0.28 |
Among the neutral and basic non-oxidizing salts, the corrosion resistance of 0MO28Ni65Fe5 alloy is good, and the test results in non-oxidizing acid salts (chloride, sulfate and fluoride salt) are shown in Table 7-23. Clearly, Hastelloy B (0MO28Ni65Fe5) alloy is also corrosion resistant. However, in oxidizing acidic salts, such as in ferric chloride, copper chloride, ferric sulfate, copper sulfate, etc., Hastelloy B (0MO28Ni65Fe5) alloy is only resistant to corrosion in very dilute solutions. If the concentration is slightly higher, it will be severely corroded. Some test results are shown in Table 7-24.
Table 7-23 Corrosion resistance of Hastelloy B (0MO28Ni65Fe5) alloy in chlorides and other salts
| Medium |
Temperature ℃ |
test hour/h |
corrosion rate /mm•a1 |
|
|
In a closed evaporator，53%MgCl2 + 1% NaCl+ 1% KCI +2% LiCl2 |
liquid phase |
170 |
5 |
0. 100 |
|
gas phase |
170 |
5 |
0.075 |
|
|
In boiling 42% MgCl2中 |
156 |
35 |
0.025 |
|
|
In the evaporator，42% MgCl2中 |
liquid phase |
160 |
56 |
0. 045 |
|
gas phase（with air） |
150 |
32 |
0.475 |
|
|
55% CaCl2,liquid phase |
93 |
29 |
0. 050 |
|
|
62% CaCl2,liquid phase |
154 |
56 |
0.025 |
|
|
73% CaCl2,liquid phase |
177 |
36 |
0.050 |
|
|
54%CaCl2, < 1 %HCI,filling air |
127 |
13 |
0.875 |
|
|
6.3% NH4Cl , 7.6% CaCl2, 5%NaCl 1%KCI, 4.6% MgCl2 , 0.8% NH3 , 0.8。12, 0.8Complement |
90 |
60 |
0.045 |
|
|
26% AlCl 3(in the tank） |
18 |
21 |
0.010 |
|
|
SbCl3 + 0.5% H2O |
Liquid phase agitation |
100 |
12 |
0. 200 |
|
Gas phase |
100 |
12 |
0. 140 |
|
|
30% ~40% BaCl3 |
150 |
35 |
0.0775 |
|
|
100% POCl3 (in the tank） |
21 |
67 |
0. 0050 |
|
|
In the evaporator，71％ ZnCl2 |
107 |
35 |
0.090 |
|
|
71％ ZnCl2(in the tank) |
50 |
27 |
0. 0155 |
|
|
48%ZnSOi,agitation |
105 |
59 |
0.1130 |
|
|
30% ~50% SnF2 +2% ~5%HF acid (in the crystallizer) |
44 |
30 |
0. 120 |
|
Table 7-24 Corrosion resistance of 0Mo28Ni65Fe5 alloy in ferric chloride and copper chloride solution
|
Medium |
corrosion rate mm•a1 |
| 2% CuCl2 Solution |
3.825 |
| 10% CuCl2 Solution |
>25.00 |
| 2% FeCl3 Solution |
5.850 |
| 10% FeCl3 Solution |
>25.00 |
6 : halogen elements and their hydride gases
In the halogen element and its hydride gas. The test results of hastelloyb alloy are shown in Table 7-25 and Figure 7-19. It can be seen from the table that Hastelloy B alloy is extremely corrosion resistant in dry chlorine, dry bromine and high temperature iodine gas, but it is severely corroded in wet state and cannot be used. Tests in CCI4 and CoCl2 high temperature gases have shown that the Hastelloy B alloy has a very good corrosion resistance and that the alloy is also resistant to corrosion even if the medium contains moisture, see Table 7-26.
Table 7-25 Corrosion of Hastelloy B alloy in chlorine, bromine and iodine
|
Test Medium |
|
test hour/H |
Corrosion rate/ mm•a1 |
|
Gas（含0.04% H2O)，room temperature |
0. 100 |
||
|
moisture gas， |
room temperature |
2 |
11.95 |
|
Dry bromine（含0.003% H2O)，room temperature |
1 |
0.0130 | |
|
bromine（0.02% H2O),room temperature |
10 |
0.035 | |
|
Bromine water |
room temperature |
69 |
3.050 |
|
High temperature iodine vapor |
300℃ |
0. 00310 | |
|
450℃ |
1 |
0. 0375 | |
Table 7-26 Corrosion resistance of Hastelloy B alloy in CCl4 and CoCl2
|
Medium |
corrosion rate/ mm•a1 | ||
|
400℃ |
500℃ |
600℃ | |
|
Dry CoCl2 ,5000ml/h |
0. 00050 |
0.0015 |
0.20 |
|
CoCl2+ Water + saturated air，1000ml/h |
0. 0050 |
0. 020-0. 0225 |
0. 10-0. 175 |
|
CCl+dry air，500ml/h |
0.0125 -0. 020 |
0. 120 | |
Since Hastelloy B alloy has high Mo content and molybdenum fluoride is volatile, Hastelloy B alloy is not resistant to corrosion in high temperature fluorine gas. For example, at 600 °C and a fluorine gas flow rate of 75 to 100 mL/min, the Hastelloy B alloy with a thickness of 0.950 mm was severely corroded after 95 h of testing. However, in high-temperature HF gas, Hastelloy B alloy is corrosion-resistant (36H hour test in HF gas of 500~600 degrees, the corrosion rate is only 0.050mm/a)
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Post time: May-20-2019