Corrosion Protection
"This material protects against corrosion" is a rather general and sometimes misleading statement. Corrosion is always interrelated with the chemicals which attack the material. The following data sheet shows the resistance of wrought nickel (99.2%) against some selected chemicals. Our high-grade electroplated nickel or MICRO-NickelTM offer even better resistance.
Chemicals | Concentration | Resistance | Notes |
Caustic soda | 4 - 75% | +++ to + | |
Caustic soda | 100% | ~ | 400°C/752°F |
Natrium sulfide | ~ | ||
Ammonium hydroxide | > 2.5% | - - - to - - | |
Hydrochlric acid | 1 - 30% | ~ to - - - | |
Nitric acid | - - - | ||
Phosphoric acid | - to --- | ||
Hydroflouric acid | + to - | ||
Sulfuric acid | 5 - 93% | - to - - | with air, stirred |
Sulfuric acid | 5 - 9 % | + to - - | no air, unstirred |
Acetic acid | 6% | ++ | |
Butyric acid | 2 - 4% | ~ | |
Lactic acid | 1% | + | |
Citric acid | 2 - 4% | ~ | |
Fatty acids | + to ~ | 225-270°C/437-518°F |
sign | Degree of corrosion resistance | Loss of weight (g m-1d-1) |
+++ | very good corrosion resistance | ≤ 0,025 |
++ | resistant, very good useable | 0,025...0,25 |
+ | resistant, good useable | 0,25...2,5 |
~ | resistant, useable | 2,5...25 |
- | less resistant, restricted use | 25...75 |
- - | poor resistance, critical use | 75...250 |
- - - | no resistance, unuseable | > 250 |
