High Phosphorus EN
Physical Properties

GENERAL
High Phosphorus Electroless Nickel is an advanced Electroless Nickel process designed o produce deposits exhibiting superior performance in many engineering and functional applications. The Electroless Nickel NI-425 process chemically deposits a uniform nickel phosphorus alloy and is capable of plating on a wide
variety of substrates including aluminum alloys, stainless steel, carbon and alloy steels and copper alloys.

"High Phosphorus Electroless Nickel" basically means that we deposit a coating of nickel-phosphorus alloy without the use of electric current. The coating is deposited by means of an autocatalystic chemical reduction which insures a uniform, hard and highly protective finish. Recent laboratory and metallurgical tests have demonstrated that different phosphorus levels in Electroless Nickel baths produce different deposit characteristics. The purpose of this bulletin therefore is to make metallurgists, engineers and platers aware of theses differences and what they mean.

High Phosphorus Nickel is recommended where superior corrosion resistance is desired. Uses include various components in the electronics industry, oil and gas, printing, aerospace, and the chemical processing industries. In addition, Electroless Nickel NI-425 is particularly useful for food and meat processing
applications, as well as for medical and surgical parts due to its resistance to staining. The high phosphorus content of the deposit adds to its functional properties including a compressive stress with resulting minimal fatigue debit. The narrow melting range of the deposit makes it suitable for certain welding and brazing application.

Features of High Phosphorus Electroless Nickel

• Excellent corrosion resistance
• Minimal porosity at thicknesses of >0.4 mil
• Compressive stress
• Good lubricity, wear and abrasion resistance
• Suitable for high build-up applications (>10 mils)
• Non-magnetic deposit
• Narrow melting temperature, suitable for brazing and welding applications

UNIFORM DEPOSIT
One big advantage that "Electroless Nickel" has over electrolytic plating is that there is virually no build-up on edges. Build-up occurs on parts being electroplated due to the high current density at these points. This is evident with heavy deposition when precautions are not taken for masking and special anoding. Because our process is autocatalytic, no current is required. As a result, edge build-up is eliminated. In addition, post plating, grinding and polishing are minimized thus effecting labor savings.