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General Corrosion resistance of 0MO28Ni65Fe5(hastelloyb) alloy —in alkali and salt

General Corrosion resistance of 0MO28Ni65Fe5(hastelloyb) alloy —in alkali and salt

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

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 CoCl,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