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.
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.
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.
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.
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.
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.