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Selected Corrosion Data

Hydrobromic Acid

Conc.
Wt.%

50°F

75°F

100°F

125°F

150°F

175°F

200°F

225°F

Boiling

10°C

24°C

38°C

52°C

66°C

79°C

93°C

107°C

2.5

-

-

-

-

<0.01

-

0.01

-

0.01

5

-

-

-

-

<0.01

-

0.01

-

0.15

7.5

-

-

-

-

-

<0.01

<0.01

-

0.58

10

-

-

-

-

<0.01

<0.01

0.34

-

1.71

15

-

-

-

-

-

0.10

0.94

-

-

20

-

-

-

-

<0.01

0.61

0.86

-

2.52

25

-

-

<0.01

0.15

0.30

0.53

0.91

-

-

30

-

-

0.06

0.20

0.29

0.48

0.91

-

-

40

-

-

0.07

0.13

0.18

0.32

0.60

-

-

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 71-97, 26-99, 49-99, 27-02, and 37-02.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Hydrobromic C-2000

Hydrochloric Acid

Conc.
Wt.%

50°F

75°F

100°F

125°F

150°F

175°F

200°F

225°F

Boiling

10°C

24°C

38°C

52°C

66°C

79°C

93°C

107°C

1

-

-

-

-

-

-

-

-

0.01

1.5

-

-

-

-

-

-

-

-

0.02

2

-

-

-

-

<0.01

<0.01

<0.01

-

0.09

2.5

-

-

-

-

-

<0.01

0.01

-

0.34

3

-

-

-

-

<0.01

<0.01

0.02

-

0.36

3.5

-

-

-

-

-

0.01

0.65

-

1.61

4

-

-

-

-

<0.01

0.01

1.24

-

2.15

4.5

-

-

-

-

<0.01

0.01

1.48

-

3.98

5

-

-

-

0.01

<0.01

<0.01

1.37

-

4.23

7.5

-

-

<0.01

<0.01

0.57

1.12

-

-

-

10

-

-

<0.01

0.28

0.65

1.54

-

-

-

15

-

-

0.18

0.38

0.70

1.69

-

-

-

20

-

-

0.16

0.36

0.69

1.46

-

-

-

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 8-95, 11-95, 18-95, 36-95, 3-96, 9-96, 16-96, and 25-96.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Hydrochloric C-2000

Hydrofluoric Acid

Conc.
Wt.%

50°F

75°F

100°F

125°F

150°F

175°F

200°F

225°F

Boiling

10°C

24°C

38°C

52°C

66°C

79°C

93°C

107°C

1

-

-

0.01

0.03

0.08

0.18

-

-

-

5

-

-

0.02

0.09

0.33

0.57

-

-

-

10

-

-

0.06

0.22

0.56

0.99

2.27

-

-

20

-

-

0.21

0.48

0.68

0.67

0.74

-

-

30

-

-

0.25

0.62

1.61

1.34

1.46

-

-

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 3-99, 24-99, and 46-99.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
Hydrofluoric acid is known to cause internal, as well as external, attack of the nickel alloys; these values signify only the amount of external attack encountered during laboratory testing.

Hydrofluoric C-2000

Nitric Acid

Conc.
Wt.%

50°F

75°F

100°F

125°F

150°F

175°F

200°F

225°F

Boiling

10°C

24°C

38°C

52°C

66°C

79°C

93°C

107°C

10

-

-

-

-

-

-

-

-

-

20

-

-

-

-

-

-

-

-

0.02

30

-

-

-

-

-

-

-

-

-

40

-

-

-

-

-

0.02

0.06

-

0.24

50

-

-

-

-

-

0.05

0.12

-

0.51

60

-

-

-

-

-

0.08

0.19

0.43

0.94

65

-

-

-

-

-

-

-

-

1.00

70

-

-

-

-

-

0.10

0.29

0.59

1.66

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 8-95 and 11-97.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Nitric C-2000

Phosphoric Acid

Conc.
Wt.%

125°F

150°F

175°F

200°F

225°F

250°F

275°F

300°F

Boiling

52°C

66°C

79°C

93°C

107°C

121°C

135°C

149°C

50

-

-

<0.01

0.01

-

-

-

-

0.03

60

-

-

<0.01

0.01

0.02

-

-

-

0.08

70

-

-

<0.01

0.01

0.02

0.07

-

-

0.15

75

-

-

-

-

-

-

-

-

0.84

80

-

-

<0.01

0.01

-

0.08

0.14

-

0.40

85

-

-

-

-

-

0.05

0.17

0.33

7.90

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 19-95 and 64-96.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Phosphoric C-2000

Sulfuric Acid

Conc.
Wt.%

75°F

100°F

125°F

150°F

175°F

200°F

225°F

250°F

275°F

300°F

350°F

Boiling

24°C

38°C

52°C

66°C

79°C

93°C

107°C

121°C

135°C

149°C

177°C

1

-

-

-

-

-

-

-

-

-

-

-

-

2

-

-

-

-

-

-

-

-

-

-

-

-

3

-

-

-

-

-

-

-

-

-

-

-

-

4

-

-

-

-

-

-

-

-

-

-

-

-

5

-

-

-

-

-

-

-

-

-

-

-

-

10

-

-

-

-

<0.01

0.02

-

-

-

-

-

0.09

20

-

-

-

-

0.01

0.03

-

-

-

-

-

0.18

30

-

-

-

-

0.01

0.04

-

-

-

-

-

0.42

40

-

-

-

-

0.01

0.05

0.72

-

-

-

-

1.13

50

-

-

-

<0.01

0.02

0.16

0.68

1.71

-

-

-

3.35

60

-

-

-

<0.01

0.02

0.37

0.84

2.81

-

-

-

9.27

70

-

-

-

0.01

0.07

0.42

1.40

4.32

-

-

-

-

80

-

-

-

0.06

0.28

0.99

1.62

2.37

-

-

-

-

90

-

-

-

0.02

0.07

0.37

1.17

2.24

-

-

-

-

96

-

-

-

-

0.05

0.19

0.63

-

-

-

-

-

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 8-95, 11-95, 18-95, 43-95, 9-96, 15-96, and 20-96.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Sulfuric C-2000

 Reagent Grade Solutions, mm/y

Chemical Conc. 100°F 125°F 150°F 175°F 200°F Boiling
38°C 52°C 66°C 79°C 93°C
Acetic Acid 99 - - - - - <0.01
Chromic Acid 10 - - 0.10 - - -
20 - - 0.61 - - -
Formic Acid 88 - - - - - 0.01
Hydrobromic Acid 2.5 - - <0.01 - 0.01 0.01
5 - - <0.01 - 0.01 0.15
7.5 - - - <0.01 <0.01 0.58
10 - - <0.01 <0.01 0.34 1.71
15 - - - 0.10 0.94 -
20 - - <0.01 0.61 0.86 -
25 <0.01 0.15 0.30 0.53 0.91 -
30 0.06 0.20 0.29 0.48 0.91 -
40 0.07 0.13 0.18 0.32 0.60 -
Hydrochloric Acid 1 - - - - - 0.01
2 - - <0.01 <0.01 <0.01 0.09
2.5 - - - <0.01 0.01 0.34
3 - - <0.01 <0.01 0.02 0.36
3.5 - - - 0.01 0.65 1.61
4 - - <0.01 0.01 1.24 -
4.5 - - <0.01 0.01 1.48 -
5 - 0.01 <0.01 <0.01 1.37 -
7.5 <0.01 <0.01 0.57 1.12 - -
10 <0.01 0.28 0.65 1.54 - -
15 0.18 0.38 0.70 1.69 - -
20 0.16 0.36 0.69 1.46 - -
Hydrofluoric Acid* 1 0.01 0.03 0.08 0.18 - -
5 0.02 0.09 0.33 0.57 - -
10 0.06 0.22 0.56 0.99 2.27 -
20 0.21 0.48 0.68 0.67 0.74 -
30 0.25 0.62 1.61 1.34 1.46 -
Nitric Acid 20 - - - - - 0.02
30 - - - - - 0.09
40 - - - 0.02 0.06 0.24
50 - - - 0.05 0.12 0.51
60 - - - 0.08 0.19 0.94
65 - - - - - 1.00
70 - - - 0.10 0.29 1.66
Phosphoric Acid 50 - - - <0.01 0.01 0.03
60 - - - <0.01 0.01 0.08
70 - - - <0.01 0.01 0.15
75 - - - - - 0.84
80 - - - <0.01 0.01 -
Sulfuric Acid 10 - - - <0.01 0.02 0.09
20 - - - 0.01 0.03 0.18
30 - - - 0.01 0.04 0.42
40 - - - 0.01 0.05 1.13
50 - - <0.01 0.02 0.16 -
60 - - <0.01 0.02 0.37 -
70 - - 0.01 0.07 0.42 -
80 - - 0.06 0.28 0.99 -
90 - - 0.02 0.07 0.37 -
96 - - - 0.05 0.19 -

*Hydrofluoric acid can also induce internal attack of nickel alloys; these values represent only external attack.

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