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Selected Corrosion Data

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

-

<0.01

<0.01

0.10

-

0.48

1.5

-

-

-

-

-

-

-

-

-

2

-

-

-

-

0.01

0.03

-

-

1.99

2.5

-

-

-

-

-

-

-

-

-

3

-

-

-

-

0.02

0.04

-

-

-

3.5

-

-

-

-

-

-

-

-

-

4

-

-

-

-

-

-

-

-

-

4.5

-

-

-

-

-

-

-

-

-

5

-

-

<0.01

0.27

0.42

0.98

-

-

4.37

7.5

-

-

-

-

-

-

-

-

-

10

-

0.06

0.19

0.30

0.57

1.11

-

-

6.91

15

-

0.06

0.18

0.39

0.57

1.33

2.33

-

6.35

20

-

0.05

0.14

0.27

0.55

1.12

2.19

-

5.72

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 2-74 and 73-96.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Hydrochloric C-4

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

-

-

-

0.01

0.02

-

-

-

-

-

-

0.41

10

-

<0.01

-

0.01

0.03

0.19

-

-

-

-

-

0.43

20

-

-

-

0.01

0.05

0.38

-

-

-

-

-

0.89

30

-

<0.01

-

0.02

0.07

0.54

-

-

-

-

-

1.85

40

-

-

<0.01

0.03

0.38

0.87

-

-

-

-

-

3.63

50

-

0.02

0.01

0.03

0.63

0.99

-

-

-

-

-

9.96

60

-

-

0.03

0.15

0.67

1.24

-

-

-

-

-

-

70

-

0.04

0.06

0.14

0.46

0.94

-

-

-

-

-

-

80

-

-

0.04

0.13

1.10

2.47

-

-

-

-

-

-

90

-

0.04

0.05

0.19

0.71

2.63

-

-

-

-

-

-

96

-

-

-

-

-

-

-

-

-

-

-

-

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 19-73, 24-94, and 68-96.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Sulfuric C-4

 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
Hydrobromic Acid 2.5 - - <0.01 - <0.01 0.08
5 - - <0.01 0.01 0.76 -
7.5 - - 0.03 0.18 0.76 -
10 - <0.01 0.37 0.53 - -
15 <0.01 0.24 0.37 0.56 - -
20 0.15 0.24 0.35 0.51 - -
30 0.10 0.16 0.23 0.41 0.67 -
40 - 0.11 0.17 0.28 0.44 -
Hydrochloric Acid 1 <0.01 - <0.01 <0.01 0.10 0.48
2 - - 0.01 0.03 - 1.99
3 - - 0.02 0.04 - -
5 <0.01 0.27 0.42 0.98 - -
10 0.19 0.30 0.57 1.11 - -
15 0.18 0.39 0.57 1.33 - -
20 0.14 0.27 0.55 1.12 - -
Hydrofluoric Acid* 5 - - - 0.59 - -
Sulfuric Acid 10 <0.01 - 0.01 0.03 0.19 0.43
20 - - 0.01 0.05 0.38 0.89
30 <0.01 - 0.02 0.07 0.54 1.85
40 - <0.01 0.03 0.38 0.87 -
50 0.02 0.01 0.03 0.63 0.99 -
60 - 0.03 0.15 0.67 1.24 -
70 0.04 0.06 0.14 0.46 0.94 -
80 - 0.04 0.13 1.10 2.47 -
90 0.04 0.05 0.19 0.71 2.63 -
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