Nickel: high resistance to corrosion in acids & alkalis
01 April 2021
Commercially pure wrought Nickel features good mechanical properties over a wide range of temperatures and excellent resistance to many corrosives, in particular hydroxides. Nickel is also an important material used in the manufacture of stainless steels, and it increases the weldability, formability, and corrosion resistance of the metal.
Nickel also has outstanding resistance to caustic alkalis up to and including the molten state. In acid, alkaline and neutral salt solutions the material shows good resistance, but in oxidizing salt solutions severe corrosion attacks will occur. The material is also resistant to all dry gases at room temperature and in dry chlorine and hydrogen chloride may be used in temperatures up to 550°C. Resistance to mineral acids varies according to temperature and concentration and whether the solution is aerated or not. Corrosion resistance is better in de-aerated acid.
Image credit: High Performance Alloys, Inc.