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 71-97, 26-99, 49-99, 27-02, and 37-02.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
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 8-95, 11-95, 18-95, 36-95, 3-96, 9-96, 16-96, and 25-96.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
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 3-99, 24-99, and 46-99.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
Hydrofluoric acid is known to cause internal, as well as external, attack of the nickel alloys; these values signify only the amount of external attack encountered during laboratory testing.
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 8-95 and 11-97.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
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 19-95 and 64-96.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
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 8-95, 11-95, 18-95, 43-95, 9-96, 15-96, and 20-96.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.
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 |
- |
- |
- |
- |
- |
<0.01 |
Chromic Acid
|
10 |
- |
- |
0.10 |
- |
- |
- |
20 |
- |
- |
0.61 |
- |
- |
- |
Formic Acid
|
88 |
- |
- |
- |
- |
- |
0.01 |
Hydrobromic Acid
|
2.5 |
- |
- |
<0.01 |
- |
0.01 |
0.01 |
5 |
- |
- |
<0.01 |
- |
0.01 |
0.15 |
7.5 |
- |
- |
- |
<0.01 |
<0.01 |
0.58 |
10 |
- |
- |
<0.01 |
<0.01 |
0.34 |
1.71 |
15 |
- |
- |
- |
0.10 |
0.94 |
- |
20 |
- |
- |
<0.01 |
0.61 |
0.86 |
- |
25 |
<0.01 |
0.15 |
0.30 |
0.53 |
0.91 |
- |
30 |
0.06 |
0.20 |
0.29 |
0.48 |
0.91 |
- |
40 |
0.07 |
0.13 |
0.18 |
0.32 |
0.60 |
- |
Hydrochloric Acid
|
1 |
- |
- |
- |
- |
- |
0.01 |
2 |
- |
- |
<0.01 |
<0.01 |
<0.01 |
0.09 |
2.5 |
- |
- |
- |
<0.01 |
0.01 |
0.34 |
3 |
- |
- |
<0.01 |
<0.01 |
0.02 |
0.36 |
3.5 |
- |
- |
- |
0.01 |
0.65 |
1.61 |
4 |
- |
- |
<0.01 |
0.01 |
1.24 |
- |
4.5 |
- |
- |
<0.01 |
0.01 |
1.48 |
- |
5 |
- |
0.01 |
<0.01 |
<0.01 |
1.37 |
- |
7.5 |
<0.01 |
<0.01 |
0.57 |
1.12 |
- |
- |
10 |
<0.01 |
0.28 |
0.65 |
1.54 |
- |
- |
15 |
0.18 |
0.38 |
0.70 |
1.69 |
- |
- |
20 |
0.16 |
0.36 |
0.69 |
1.46 |
- |
- |
Hydrofluoric Acid*
|
1 |
0.01 |
0.03 |
0.08 |
0.18 |
- |
- |
5 |
0.02 |
0.09 |
0.33 |
0.57 |
- |
- |
10 |
0.06 |
0.22 |
0.56 |
0.99 |
2.27 |
- |
20 |
0.21 |
0.48 |
0.68 |
0.67 |
0.74 |
- |
30 |
0.25 |
0.62 |
1.61 |
1.34 |
1.46 |
- |
Nitric Acid
|
20 |
- |
- |
- |
- |
- |
0.02 |
30 |
- |
- |
- |
- |
- |
0.09 |
40 |
- |
- |
- |
0.02 |
0.06 |
0.24 |
50 |
- |
- |
- |
0.05 |
0.12 |
0.51 |
60 |
- |
- |
- |
0.08 |
0.19 |
0.94 |
65 |
- |
- |
- |
- |
- |
1.00 |
70 |
- |
- |
- |
0.10 |
0.29 |
1.66 |
Phosphoric Acid
|
50 |
- |
- |
- |
<0.01 |
0.01 |
0.03 |
60 |
- |
- |
- |
<0.01 |
0.01 |
0.08 |
70 |
- |
- |
- |
<0.01 |
0.01 |
0.15 |
75 |
- |
- |
- |
- |
- |
0.84 |
80 |
- |
- |
- |
<0.01 |
0.01 |
- |
Sulfuric Acid
|
10 |
- |
- |
- |
<0.01 |
0.02 |
0.09 |
20 |
- |
- |
- |
0.01 |
0.03 |
0.18 |
30 |
- |
- |
- |
0.01 |
0.04 |
0.42 |
40 |
- |
- |
- |
0.01 |
0.05 |
1.13 |
50 |
- |
- |
<0.01 |
0.02 |
0.16 |
- |
60 |
- |
- |
<0.01 |
0.02 |
0.37 |
- |
70 |
- |
- |
0.01 |
0.07 |
0.42 |
- |
80 |
- |
- |
0.06 |
0.28 |
0.99 |
- |
90 |
- |
- |
0.02 |
0.07 |
0.37 |
- |
96 |
- |
- |
- |
0.05 |
0.19 |
- |
*Hydrofluoric acid can also induce internal attack of nickel alloys; these values represent only external attack.