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Electroless Nickel Plating

    Electroless Nickel is an autocatalytic chemical reduction process (no electric current is used) that deposits a nickel-phosphorus alloy in a uniformly hard, highly protective finish. By increasing surface hardness, Electroless Nickel improves resistance to friction, wear and corrosion. Our process prolongs by 2-to-10 times the service life of parts and components. Different Electroless Nickel baths produce different deposit characteristics. Since no anoding is required, edge buildup is virtually eliminated.

 

Electrolytic Nickel

Electroless Nickel

 

The uniformity of the coating obtained from electroless nickel plating, makes it highly suitable for use on engineering components as the machined tolerances of a component are not deformed by the plating process. The uniformity of the coating and the fact that it is a chemical reaction, give the electroless nickel deposit a number of properties which are advantageous to many applications.

Applications for Electroless Nickel:

           The hardness and corrosion resistance of electroless nickel are key factors in many successful applications. These coatings are used for a variety of applications including electrical connectors, microwave housings, valves and pump bodies, printer shafts, hard drive computer components and more. These unique coatings are applied to impart corrosion protection, wear resistance, to provide solderability, to provide a non-porous barrier layer, or otherwise enhance the performance or useful life of a particular component. Electroless nickel is used to coat components made of steel, stainless steel, aluminum, copper, brass, magnesium and a number of non-conductive materials. They are used in such diverse industries such as the automotive industry, chemical process industry, the oil and gas industry, the aerospace industry and the electronics industry.

                           We offer 100% lead free and / or cadmium free component systems to comply with "green" initiatives. The largest growth area for these coatings outside of electronics has been the automotive industry. This segment has specified electroless nickel on a number of brake, transmission, steering assembly components and other parts.

Coating Hardness and Heat Treatment: The hardness of electroless nickel is a key factor in many successful applications. The hardness of electroless nickel coatings can be enhanced by heat treatment and is dependent on phosphorus content and heat treatment time and temperature. Electroless Nickel can be hardened to Rc68 by heat treating at 650 - 700F (343 - 371C) for one hour. Electroless Nickel provides a dramatic increase in hardness, compared with electro-deposited nickel (Rc46 as deposited) and standard chrome baths ( Rc 62 - 64 as deposited ).

Finish/Brightness :  Electroless Nickel does not substantially affect the surface finish of parts. A part with a 15 micro-inch finish prior to plating will have approximately the same finish after plating. All components must be ground or polished to final finish prior to plating.

Deposit Ductility :

Electroless nickel deposits are not considered to be "ductile" due to their high hardness. However, there is a relationship between ductility and phosphorus content which is outlined in below graph

Corrosion Resistance :

             The surface condition of the substrate can have a significant effect on the ability of the electroless nickel coating to serve as a barrier to corrosion. Generally, thicker deposits are suggested for rougher substrates, such as castings, to insure low porosity and optimum corrosion resistance.The different classes of electroless nickel coatings, either low, medium or high phosphorus, may not all perform in the same manner in a corrosive environment. For example, the low phosphorus electroless nickel coatings will tend to corrode less in strongly alkaline environments (such as a low phosphorus electroless nickel plated valve in a chlor-alkali manufacturing plant), than any other electroless nickel coating. Similarly, the high phosphorus electroless nickel coatings tend to be more amorphous or "glass like" in structure and tend to perform superior to other electroless nickel coatings in strongly acid environments.

Electroless nickel processes:

Process/
Description

% Phos

Feature/Benefit

Bright Mid Phos EN

6-9

High speed Consistent brightness throughout life

Semi Bright Mid Phos EN

6-9

High speed Fast deposition rate throughout life

Bright Low Mid Phos EN

5-7

Very high speed Ultra bright throughout life

Lead Free Cadmium Free
Mid Phos EN

5-7

Extremely stable and robust High plating rate and long bath life

High Phos EN

9-12

Superior corrosion resistance

   We supply High phosphorous,  Mid phosphorous, Low phosphorous Electroless nickel chemicals . For your requirement and start a new electroless nickel bath  contact us

 

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