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Electro Less Nickel Plating

Electroless nickel plating is a nickel - phosphorus alloy which can be applied to metallic surface and also to semi-conducting materials to provide coatings which are of uniform thickness and have excellent chemical and physical properties. The term 'Electroless' is applied to these coatings as they are deposited without the use of an electric current as in conventional electroplating. This plating has the ability to cover complex geometry & internal as well as external surface, holes, recesses and threaded parts.

The main features of this coating that distinguish them uniformity of thickness distribution, hardness & low level of stress. IT is a chemical reduction process which depends upon the catalytic reduction process of nickel ions in an aqueous solution (containing a chemical reducing agent) and the subsequent deposition of nickel metal without the use of electrical energy.

Due to its exceptional corrosion resistance and high hardness, the process finds wide application on items such as valves, pump parts etc., to enhance the life of components exposed to severe conditions of service, particularly in the oil field and marine sector. With correct pretreatment sequence and accurate process control, good adhesion and excellent service performance can be obtained from EN deposited on a multitude of metallic and non-metallic substractes.

    Distinct advantages of EN plating are:
  • Uniformity of the deposits, even on complex shapes.
  • Deposits are often less porous and thus provide better barrier corrosion protection to steel substrates, much superior to that of electroplated nickel and hard chrome
  • The deposits cause about 1/5th as much hydrogen absorption as electrolytic nickel and about 1/10th as much hard chrome.
  • Deposits can be plated with zero or compressive stress.
  • Deposits have inherent lubricity and non-galling characteristics, unlike electrolytic nickel.
  • Deposits have good wetability for oils
  • In general low phosphorus and especially electroless nickel boron are considered solderable. Mid and high phosphorus EN's are far worse for solderability
  • Deposits are much harder with as-plated microhardness of 450 - 600 VPN which can be increased to 1000-1100 VHN by a suitable heat-treatment

The versatility of electroless nickel plating is demonstrated by the wide range of coatings possible. The following are important types of coatings industrially available (reference)

Low Phosphorous (Hard)

A unique bath providing an as-plated deposit hardness of up to 60 Rockwell This bath provides a deposit nearly as hard as Hard Chrome, with the advantage of a uniform thickness inside complex configurations, as well as outside. The deposit is so uniform that grinding after plating is eliminated. Low Phosphorous Electroless Nickel offers excellent resistance to alkaline corrosive environments.

Medium Phosphorous (Bright High Speed)

This is a workhorse electroless nickel. It has proven itself over the years. Steel parts plated with Medium Phosphorous electroless nickel Plating will in many cases perform like stainless steel. Electroless nickel will not build up on edges or ends, and it plates inside and out giving uniform total coverage. With heat treatment, medium phosphorous electroless nickel can be hardened from 45 Rockwell C to as high as 68 Rockwell C.

High Phosphorous

This finish provides maximum corrosion resistance. High Phosphorous electroless nickel Plating is standard in industries that require resistance to strongly acidic corrosive environments like oil drilling and coal mining. High Phosphorous electroless nickel has a low degree of solderability. It will remain solderable for only a brief period of time after plating. This makes it a desirable finish for electronics parts such as connector housings and semiconductor packaging.

    Physical Properties
  • Surface Hardness: As plated 48-50 RC. After Heat Treatment (400?C, 1 hr) 62-63) RC
  • Melting Point :- 890?C
  • Density :- 7.85-7.95 gm/cm qb.
  • Coefficient of friction :- EN Vs STEEL 0.3
  • Coefficient of Thermal Expansion :- 0.13 microns /?c
    Applications:
  • Due to its unique properties of excellent corrosion resistance, combined with a high wear resistance and uniformity of coating, EN finds extensive applications in a number of fields. Some of the prominent areas of application are
  • Oil & Gas: Valve components, such as Balls, Gates, Plugs etc. And other components such as pumps, pipe fittings, packers, barrels etc.
  • Chemical Processing: Heat Exchangers, Filter Units, pump housing and impellers, mixing blades etc.
  • Plastics: Molds and dies for injecting and low and blow molding of plastics components, extruders, machine parts rollers etc.
  • Textile: Printing cylinders, machine parts, spinneret's, threaded guides etc.
  • Automotive: Shock Absorbers, heat sinks, gears, cylinders, brake pistons etc.
  • Aviation & Aerospace: Satellite and rocket components, rams pistons, valve components etc.
  • Food & pharmaceutical: Capsule machinery dies, chocolates molds, food processing machinery components etc.

About Us


Ankur electroplating Industries was started in 1981 with an idea of serving different type of industries with entirely different application of electroplating process successfully like, Hard Chrome Plating, Nickel Chrome Plating, Electroless Nickel Plating, Silver Plating, Zinc Plating, Tin Plating, Soft/Hard Anodizing and other processes.

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  • Contact Person:
    Kirtan Patel
    (M) 098985 77660
    Purvesh Patel
    (M) 098793 34477
  • Tele / Fax.:
    02646 250751

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