Mid and Hight Phosphorous Electroless Nickel Plating
Electroless nickel-phosphorus plating is a chemical process that deposits an even layer of nickel-phosphorus alloy on the surface of a solid substrate, like metal or plastic.
The metallurgical properties of the alloy depend on the percentage of phosphorus.
- Low-phosphorus coatings have up to 4% P contents. Their hardness reaches up to 60 on the Rockwell C scale.
- Medium-phosphorus coatings, the most common type, are defined as those with 4 to 10% P, although the range depends on the application: up to 4–7% for decorative applications, 6–9% for industrial applications, and 4–10% for electronics.
- High-phosphorus coatings have 10–14% P. They are preferred for parts that will be exposed to highly corrosive acidic environments such as oil drilling and coal mining. Their hardness mat score up to 600 on Vickers test.
- ASTM B-733