Electroless Nickel Plating Explanation in Details


ElectrolessNickel Plating (ENP) is that the deposit of a nickel-alloy coating by chemical reduction – while not the electrical current that’s utilized in electroplating processes.
The majority of ENP for engineering functions may be a nickel phosphorus deposit containing a pair of phosphorus.

The higher the phosphorus content the larger the corrosion resistance, but the compromise on raised phosphorus content may be a decrease in hardness. ENP is deposited by reducing nickel ions to bimetal nickel with a chemical reductant like atomic number 11 hydrophosphite. Thickness of 25-75m is common, high phosphorus ENP will edge on top of 75m though this will begin to push the boundaries of ENP.

The benefits of electroless nickel plating
ENP offers wonderful corrosion resistance to common corrodents like salt water, carbonic acid gas, atomic number 8 and H chemical compound. High phosphorus deposits of ENP (10-14% phos) is additionally amorphous, which suggests that there are not any grain or section boundaries to form initiation sites for corrosion. The uniformity of ENP versus electrolytic deposits is additionally advantageous, making a uniformly thick coating across the entire substrate; even in slots, holes and within walls of conduit.

Without heat treatment corrosion resistant high phosphorus ENP still provides smart hardness and wear resistance properties. ENP offers price-effective resolution for applications subject to conditions wherever wear and corrosion are factors; extending service life and providing a lower cost various to corrosion resistant alloys, notably wherever steel suffers localized corrosion; projection attack or weld corrosion.

What are the properties of the deposit and factors touching them?
ENP offers wonderful corrosion protection and uniformity of deposit in conjunction with smart hardness. The phosphorus content of the deposit is altered to best match the applying. Our technical team perceive every customers’ application before recommending the optimum phosphorus level – the upper the phosphorus content the larger the corrosion resistance however lower the surface hardness.

Hardness of ENP is raised by heat treatment however this produces a microcracked deposit with reduced corrosion resistance. ENP deposits uniformly, even on complicated shapes, in contrast to electroplating. ENP is at its most corrosion resistant in its amorphous section. Heat treatment causes particles of nickel phosphide to precipitate, destroying the amorphous character of the deposit. With high phos ENP deposits this happens at temperatures between 330 and 360C.

Rough, badly machined surfaces with uneven metal surfaces, burrs or cold shuts cannot be effectively plated. Cleaning: Surfaces should be free from oils, dirt and soaps fashioned by chemical reaction of oils by alkalescent cleaners. Management of the plating baths: Temperature, pH, nickel particle concentration and hypophosphite concentration all got to be rigorously managed to make sure prime quality, consistent plating end is achieved Weld spatter ought to be removed, sharp edges radiused and weld roots ground swish at electroless nickel plating. Once refurbishing / remanufacturing elements it's vital that unsound are ground to a flat surface.



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