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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

-

-

-

-

-

-

-

-

0.02

5

-

-

-

-

-

-

0.01

-

0.76

7.5

-

-

-

-

-

0.01

0.45

-

-

10

-

-

-

-

-

0.01

1.50

-

-

15

-

-

-

0.01

<0.01

0.88

-

-

-

20

-

-

-

0.01

0.46

0.80

-

-

-

25

-

-

<0.01

0.20

0.29

0.58

0.97

-

-

30

-

-

0.11

0.23

0.29

0.59

1.12

-

-

40

-

-

0.07

0.13

0.21

0.34

0.66

-

-

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 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-22

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

-

0.06

1.5

-

-

-

-

-

-

-

-

-

2

-

-

-

-

-

-

-

-

-

2.5

-

-

-

-

-

-

-

-

-

3

-

-

-

-

-

-

-

-

-

3.5

-

-

-

-

-

-

-

-

-

4

-

-

-

-

-

-

-

-

-

4.5

-

-

-

-

-

-

-

-

-

5

-

-

<0.01

-

0.44

1.44

3.02

-

8.99

7.5

-

-

-

-

-

-

-

-

-

10

-

-

0.01

0.28

0.98

1.99

4.39

-

11.68

15

-

-

-

-

0.98

1.91

-

-

11.02

20

-

-

0.20

0.32

0.90

1.72

3.38

-

9.73

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 442-82 and 176-83.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Hydrochloric C-22

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

-

0.01

-

0.01

20

-

-

-

-

0.01

-

0.02

-

0.06

30

-

-

-

-

0.01

-

0.02

-

0.13

40

-

-

-

-

0.02

0.03

0.09

-

0.26

50

-

-

-

-

-

0.05

0.14

0.33

0.59

60

-

-

-

-

0.06

0.08

0.19

0.57

1.09

70

-

-

-

-

0.05

0.11

0.33

0.71

2.53

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 443-82 and 47-04.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Nitric C-22

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

-

-

-

-

-

-

-

-

0.07

60

-

-

-

-

0.08

-

-

-

0.16

65

-

-

-

-

-

-

-

-

-

70

-

-

-

-

0.07

0.13

-

-

0.23

75

-

-

-

-

0.05

0.12

-

-

0.19

80

-

-

-

-

0.06

0.12

0.16

-

0.25

85

-

-

-

-

0.07

0.12

0.20

-

0.66

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 444-82 and 46-04.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Phosphoric C-22

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

-

-

-

-

-

0.01

-

-

-

-

-

0.13

3

-

-

-

-

-

-

-

-

-

-

-

-

4

-

-

-

-

-

-

-

-

-

-

-

-

5

-

-

-

<0.01

0.01

0.03

-

-

-

-

-

0.23

10

-

-

-

-

0.02

0.04

-

-

-

-

-

0.29

20

-

-

-

0.01

0.03

0.28

-

-

-

-

-

0.83

30

-

-

-

0.01

0.09

0.68

-

-

-

-

-

1.89

40

-

-

0.01

0.01

0.31

0.87

-

-

-

-

-

3.99

50

-

-

-

0.02

0.40

0.77

2.18

-

-

-

-

9.98

60

-

-

0.01

-

0.67

0.95

2.69

7.62

-

-

-

-

70

-

-

-

0.28

0.56

0.94

3.07

14.94

-

-

-

-

80

-

-

0.09

-

1.44

2.16

3.68

3.58

-

-

-

-

90

-

-

-

0.34

0.89

1.80

6.27

4.24

-

-

-

-

96

-

-

-

0.10

-

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 319-82, 445-82, and 19-14.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Sulfuric C-22

 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 - - - - - 0.00
Formic Acid 88 - - - - - <0.01
Hydrobromic Acid 2.5 - - - - - 0.02
5 - - - - - 0.76
7.5 - - - 0.01 - -
10 - - - 0.01 - -
15 - 0.01 <0.01 0.88 - -
20 - 0.01 0.46 0.80 - -
25 <0.01 0.20 0.29 0.58 - -
30 0.11 0.23 0.29 0.59 - -
40 0.07 0.13 0.21 0.34 - -
Hydrochloric Acid 1 - - - - 0.01 0.06
5 <0.01 - 0.44 - - -
7.5 - - - - - -
10 0.01 0.28 0.98 - - -
15 - - - - - -
20 0.20 0.32 0.90 - - -
Hydrofluoric Acid* 5 0.04 0.15 0.47 0.58 - -
10 0.09 0.33 0.64 0.78 - -
20 0.22 0.53 0.95 1.65 - -
Nitric Acid 10 - - <0.01 - 0.01 0.01
20 - - 0.01 - 0.02 0.06
30 - - 0.01 - 0.02 0.13
40 - - 0.02 - 0.09 0.26
50 - - - - 0.14 0.59
60 - - 0.06 - 0.19 1.09
65 - - - - - -
70 - - 0.05 - 0.33 2.53
Phosphoric Acid 50 - - - - - 0.07
60 - - - - - 0.16
70 - - - - - 0.23
75 - - - - - 0.19
80 - - - - - 0.25
85 - - - - - 0.66
Sulfuric Acid 10 - - - 0.02 0.04 0.29
20 - - 0.01 0.03 0.28 0.83
30 - - 0.01 0.09 0.68 -
40 - - 0.01 0.31 0.87 -
50 - - 0.02 0.40 0.77 -
60 - - - 0.67 0.95 -
70 - - 0.28 0.56 0.94 -
80 - - - 1.44 2.16 -
90 - - 0.34 0.89 1.80 -
96 - - 0.10 - 1.10 -

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

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