The class of an electroless nickel plating refers to the post-plating heat treatment process that is used; the grade of an electroless nickel plating refers to its thickness. Class Heat Treating Heat treatment after electroless nickel plating provides evidence of proper adhesion and improves the crystalline structure of the amorphous deposit for greater hardness. Six heat-treat classes are available. Class 1 is for electroless nickel coatings that require no heat treatment. Classes 2 through 5 exist at various levels between these two extremes.
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This iframe contains the logic required to handle Ajax powered Gravity Forms. The electroless nickel plating process occurs from a chemical reduction of the nickel ions within the electroless nickel solution onto a metallic substrate rather than deposition of the ions from an applied current.
As a result, the electroless nickel deposit is free of many of the problems associated with traditional electrolytic nickel including edge buildup and non-uniform coating. Electroless nickel deposits are extremely uniform, corrosion and erosion resistant and provide excellent lubricity. APT offers loose-piece barrel, rack and vibratory electroless nickel plating on nearly any metallic substrate including nearly any ferrous, cupreous and aluminum alloys as well as many exotic alloys.
The electroless nickel phosphorous content affects the properties of the deposit significantly including hardness, corrosion resistance and magnetism.
Electroless nickel plating is a unique plating process that does not require an external source of electrons for deposition as in traditional electrolytic plating. Rather, electroless nickel is a nickel-phosphorous alloy deposited by a chemical reduction reaction from hypophosphite on a catalytic substrate without the application of external current.
Since there is no applied current during deposition, electroless nickel plating deposits are free from the common nonuniformity of traditional electrolytic deposits and can cover even extremely complex geometries with excellent uniformity see: What are the differences of electroless nickel over traditional electrolytic nickel in our Technical Library Plating Topics section. Any portion of a part that is equally wetted by the electroless nickel solution will plate uniformly including interior or ID features.
It is important to note that continual solution flow is required to maintain consistent deposition rates. As such, blind holes small inner diameters of tubing or fittings will often have reduced plating thickness. The codeposited phosphorus in the electroless nickel plating deposit increases the lubricity over that of traditional nickel plating and the percentage of phosphorus in the coating also affects deposit properties such as magnetism, corrosion resistance and hardness.
In addition, a post-plate baking at temperatures above F can transition electroless nickel deposits from an amorphous as-plated state to a crystalline structure, greatly increasing hardness. Select the Electroless Nickel Technical Data PDF to the right for a comprehensive listing of physical, mechanical and electrical electroless nickel deposit properties.
Contact resistance will increase some and this process is not recommended for soldering or other bonding applications. All other deposit properties remain the same per above.
Electroless Nickel Plating
MIL-C-26074 E Electroless Nickel Plating
Replacement spec for Mil-C-26074 (electroless nickel)?