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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

-

0.01

1.5

-

-

-

-

-

-

-

-

-

2

-

-

-

<0.01

<0.01

-

-

-

9.47

2.5

-

-

-

<0.01

1.04

2.06

4.23

-

12.67

3

-

-

<0.01

<0.01

-

-

-

-

-

3.5

-

-

-

-

-

-

-

-

-

4

-

-

-

-

-

-

-

-

-

4.5

-

-

-

-

-

-

-

-

-

5

-

<0.01

0.33

0.71

1.33

2.65

9.06

-

-

7.5

<0.01

0.05

-

-

-

-

-

-

-

10

0.08

0.19

0.44

0.64

1.48

3.96

15.21

-

-

15

0.13

0.31

0.66

1.87

1.47

-

11.98

-

-

20

-

0.13

0.30

0.55

1.24

-

10.90

-

-

Data are from Corrosion Laboratory Jobs 446-82, 168-89, and 66-96.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Hydrochloric G-30

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

<0.01

-

-

-

-

-

0.47

10

-

-

-

-

<0.01

<0.01

-

-

-

-

-

0.78

20

-

-

-

-

<0.01

0.36

-

-

-

-

-

1.35

30

-

-

-

-

0.01

0.55

-

-

-

-

-

1.53

40

-

-

-

0.02

0.05

0.54

-

-

-

-

-

1.95

50

-

<0.01

<0.01

0.01

0.26

0.56

0.93

-

-

-

-

3.68

60

-

-

<0.01

0.09

0.27

0.73

1.07

-

-

-

-

8.46

70

-

<0.01

0.01

0.11

0.36

0.98

1.38

-

-

-

-

-

80

-

-

0.31

1.13

2.62

4.52

4.70

-

-

-

-

-

90

-

<0.01

0.67

2.01

3.25

6.55

6.25

-

-

-

-

-

96

-

-

0.45

1.86

2.04

1.86

1.52

-

-

-

-

-

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 Job 449-82.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Sulfuric G-30

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  - -  -  -  -  0.03
Chromic Acid 5  - -  0.02  - -  0.40
10  - -  0.14 -  -  1.23
Formic Acid 88 -  -  -  -  -  0.05
Hydrochloric Acid 1  - -  <0.01 <0.01 <0.01 0.01
2 -  <0.01 <0.01  - -  9.47
2.5 -  <0.01 1.04 2.06 4.23 - 
3 <0.01 <0.01  -  - -   -
5 0.33 0.71 1.33 2.65 -  - 
10 0.44 0.64 1.48 3.96  - - 
15 0.66 1.87 1.47 -  -  - 
20 0.30 0.55 1.24 -   -  -
Nitric Acid 50  - -  -  -  -  0.08
60  - -  -   - -  0.14
65  -  - -  -   - 0.16
Phosphoric Acid
(Reagent Grade) 		50 -   - -  -  <0.01 0.01
60 -  -   - -  -  0.14
70 -   -  - -  0.01 0.35
80 -  -   -  - -  0.61
85 -  -  -  -  -  0.84
Sulfuric Acid 10  - -  -  <0.01 <0.01 0.78
20 -   -  - <0.01 0.36 1.35
30 -  -  -  0.01 0.55 1.53
40 -  -  0.02 0.05 0.54 1.95
50 <0.01 <0.01 0.01 0.26 0.56 - 
60 -  <0.01 0.09 0.27 0.73 - 
70 <0.01 0.01 0.11 0.36 0.98  -
80  - 0.31 1.13 2.62 4.52 - 
90 <0.01 0.67 2.01 3.25 6.55  -
96  - 0.45 1.86 2.04 1.86 - 
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