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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

-

-

-

-

-

-

-

-

0.13

5

-

-

-

-

-

0.01

0.15

-

0.78

7.5

-

-

-

-

0.01

0.14

0.73

-

-

10

-

-

-

-

0.02

0.51

0.89

-

-

15

-

-

-

0.01

0.34

0.57

-

-

-

20

-

-

<0.01

0.25

0.37

0.51

-

-

-

25

-

-

0.11

0.20

0.29

0.45

0.75

-

-

30

-

-

0.12

0.20

0.28

0.44

0.75

-

-

40

-

-

0.08

0.13

0.21

0.30

0.53

-

-

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 15-02, 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-276

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

-

-

-

-

-

-

-

-

0.33

1.5

-

-

-

-

-

-

-

-

0.70

2

-

-

-

-

0.01

0.02

0.57

-

1.26

2.5

-

-

-

-

-

0.03

0.89

-

1.86

3

-

-

-

-

0.01

0.42

1.18

-

2.34

3.5

-

-

-

-

-

0.57

1.26

-

2.43

4

-

-

-

-

0.02

0.67

1.37

-

2.92

4.5

-

-

-

-

0.37

0.68

1.72

-

3.34

5

-

-

-

0.02

0.31

0.75

1.25

-

3.63

7.5

-

-

0.03

0.31

0.53

0.94

-

-

-

10

-

-

0.17

0.32

0.46

1.18

-

-

-

15

-

-

0.19

0.33

0.54

1.21

-

-

-

20

-

-

0.14

0.29

0.55

1.10

-

-

-

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-276

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

-

-

0.01

-

0.03

-

0.06

-

0.26

20

-

-

-

-

0.09

-

0.16

-

0.66

30

-

-

0.02

-

0.14

0.17

0.41

-

1.52

40

-

-

-

0.05

0.20

0.38

0.88

-

4.42

50

-

-

0.04

0.07

0.30

0.65

1.51

-

-

60

-

-

0.06

0.10

0.42

0.82

2.03

-

18.42

65

-

-

-

-

0.41

-

2.53

-

22.12

70

-

-

0.06

-

0.46

1.12

2.62

-

-

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 1-74 and 19-97.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Nitric C-276

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

0.02

-

-

-

-

0.18

60

-

-

0.01

0.02

0.08

-

-

-

0.28

70

-

-

0.01

0.02

0.08

0.08

-

-

0.13

75

-

-

-

-

-

-

-

-

1.29

80

-

-

0.01

0.02

-

0.09

0.12

-

0.31

85

-

-

-

-

-

0.09

0.17

0.29

1.68

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-276

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

-

-

-

-

0.03

0.14

-

-

-

-

-

0.18

20

-

-

-

-

0.05

0.40

-

-

-

-

-

0.49

30

-

-

-

-

0.06

0.42

-

-

-

-

-

0.83

40

-

-

-

-

0.19

0.48

1.02

-

-

-

-

1.87

50

-

-

-

0.02

0.26

0.62

1.13

2.33

-

-

-

3.64

60

-

-

-

0.02

0.30

0.67

1.03

2.87

-

-

-

13.08

70

-

-

-

0.05

0.16

0.50

1.06

13.68

-

-

-

-

80

-

-

-

0.04

0.14

0.60

2.73

5.66

-

-

-

-

90

-

-

-

0.03

0.05

0.46

1.64

4.79

-

-

-

-

96

-

-

-

-

0.04

0.18

0.95

-

-

-

-

-

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-276

 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 - - 0.13 - - -
20 - - 0.53 - - -
Formic Acid 88 - - - - - 0.04
Hydrobromic Acid 2.5 - - - - - 0.13
5 - - - - - 0.78
7.5 - - 0.01 0.14 - -
10 - - 0.02 0.51 - -
15 - 0.01 0.34 0.57 - -
20 <0.01 0.25 0.37 0.51 - -
25 0.11 0.20 0.29 0.45 - -
30 0.12 0.20 0.28 0.44 - -
40 0.08 0.13 0.21 0.30 - -
Hydrochloric Acid 1 - - - - - 0.33
1.5 - - - - - 0.70
2 - - 0.01 0.02 - -
2.5 - - - 0.03 - -
3 - - 0.01 0.42 - -
3.5 - - - 0.57 - -
4 - - 0.02 0.67 - -
4.5 - - 0.37 0.68 - -
5 - 0.02 0.31 0.75 - -
7.5 0.03 0.31 0.53 0.94 - -
10 0.17 0.32 0.46 1.18 - -
15 0.19 0.33 0.54 1.21 - -
20 0.14 0.29 0.55 1.10 - -
Hydrofluoric Acid* 5 - 0.34 - - - -
10 - 0.41 - - - -
20 - 0.48 - - - -
Nitric Acid 10 - - 0.03 - 0.06 0.26
20 - - 0.09 - 0.16 0.66
30 - - 0.14 0.17 0.41 -
40 - - 0.20 0.38 0.88 -
50 - - 0.30 0.65 1.51 -
60 - - 0.42 0.82 2.03 -
65 - - 0.41 - 2.53 -
70 - - 0.46 - 2.62 -
Phosphoric Acid 50 - - - 0.01 0.02 -
60 - - - 0.01 0.02 -
70 - - - 0.01 0.02 -
75 - - - - - -
80 - - - 0.01 0.02 -
85 - - - - - -
Sulfuric Acid 10 - - - 0.03 0.14 0.18
20 - - - 0.05 0.40 0.49
30 - - - 0.06 0.42 0.83
40 - - - 0.19 0.48 -
50 - - 0.02 0.26 0.62 -
60 - - 0.02 0.30 0.67 -
70 - - 0.05 0.16 0.50 -
80 - - 0.04 0.14 0.60 -
90 - - 0.03 0.05 0.46 -
96 - - - 0.04 0.18 -

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

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