Electroless Nickel Coating is a dense alloy of Nickel and Phosphorus. The amount of Phosphorus codeposited can range from less than 2% to more than 12%, depending upon bath formulation, operating pH and bath age. The deposition process is auto-catalytic; i.e., once a primary layer of Nickel has formed on the substrate, that layer and each subsequent layer becomes the catalyst that causes the above reaction to continue. Thus, very thick coatings can be applied, provided that the ingredients in the plating bath are replenished in an orderly manner. In general commercial practice, thickness range from 0.1 mil to 5 mils, but in some operations 30 mils deposits are not uncommon.

 

Types of Electroless Nickel Phosphorus

· Low Phosphorus ( 2-5% P content ) deposits offer improved hardness and wear characteristics, higher temperature resistance, and increased corrosion resistance in alkaline environments.

· Mid Phosphorus ( 6-9% P content ) coatings have good hardness and wear resistance, along with moderate corrosion resistance.

· High Phosphorus ( 10-12% P content ) coatings provide very high corrosion resistance and a complete lack of magnetic response.

 

Major Benefits

· Uniformity of deposit regardless of geometries

· Excellent corrosion resistance

· Wear and abrasion resistance

· Non-magnetic and magnetic properties

· Solderability and bondability

· High hardness

· Excellent adhesion

· Low coefficient of friction (high lubricity)

· EMI/RFI shielding

 

Physical Properties

· Composition: 88-98% Nickel, 2%-12% Phosphorous

· Specific Gravity: 7.9

· Melting Point: 890 deg C (1635 deg F)

· Hardness, as deposited: 500-600 Vickers (49-52 Rockwell C)

· Maximum Hardness, heat treated: 1000-1100 Vickers (58-64 Rockwell C)

 

Electroless Nickel

Professional Electroplating for Engineering and Functional Applications

Precistech Manufacturing Sdn. Bhd.

Precistech also supplies precision metal piece parts for Electronics and Semiconductors Industries that provides one-stop purchasing process to our customers together with our professional surface treatment processes.

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