Corrosion Rates of Cold-worked (40%) Sheet in Aqueous Solutions of Common Acids
|
Acid
|
Concentration
|
Temperature
|
Corrosion Rate
|
|
wt%
|
°F
|
°C
|
mpy
|
mm/y
|
|
Hydrochloric
|
1
|
Boiling
|
0.4
|
0.01
|
|
5
|
175
|
79
|
30.0
|
0.76
|
|
10
|
100
|
38
|
<0.1
|
<0.01
|
|
20
|
100
|
38
|
7.2 |
0.18
|
|
Hydrobromic
|
5
|
200
|
93
|
1.7
|
0.04
|
|
Nitric
|
20
|
Boiling
|
1.7
|
0.04
|
|
40
|
175
|
79 |
2.1
|
0.05
|
|
60
|
175
|
79
|
4.7
|
0.12
|
|
Hydrofluoric
|
5
|
125
|
52
|
18.8 |
0.48 |
|
Phosphoric
|
60
|
Boiling
|
4.7
|
0.12
|
|
Chromic
|
10
|
150
|
66
|
5.1
|
0.13
|
|
Sulfuric
|
10
|
200
|
93
|
3.8
|
0.10
|
|
20
|
200
|
93
|
2.8
|
0.07
|
|
30
|
200
|
93
|
6.8
|
0.17
|
|
40
|
175
|
79
|
1.1
|
0.03 |
|
50
|
175
|
79
|
13.1 |
0.33
|
|
60
|
150
|
66
|
0.31 |
0.01 |
|
70
|
150
|
66
|
3.1
|
0.08 |
|
80
|
150
|
66
|
4.8
|
0.12
|
|
90
|
150
|
66
|
1.3
|
0.03
|
|
ASTM G-28A*
|
-
|
Boiling
|
42.4
|
1.08
|
|
ASTM G-28B**
|
-
|
Boiling
|
9.8
|
0.25
|
*ASTM G-28A = 50% H2SO4 + 42 g/l Fe2(SO4)3
**ASTM G-28B = 23% H2SO4 + 1.2% HCl + 1% Fe3Cl + 1% CuCl2