"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
|
Notes
|
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
|