Process Electroless nickel plating
Suitable for complex shapes and large-size components. It deposits a uniform coating regardless of the shape of the part or surface irregularities, allowing savings in material. The layer has low porosity, high resistance to wear and corrosion.

In an aqueous solution containing hypophosphite, nickel-ions reduce to nickel-metal which coats the substrate surface. Accurate temperature (85-95 C) and nickel concentration control are important to achieve uniform deposition rates.

Nickel is the only high-temperature metal in commercial production by electroless method. Typical thickness between 5 to 25 micron. Deposition rate about 10-20 micron/min.
Danish Name Kemisk fornikling
Category Surface treatments, Electroless plating
Materials Substrates:
Steel
Aluminium
Plastics
Ceramics
Glasses
Nickel (coating)
Typical products Flow meter
Mould for rubber
Printing roll
Competing processes Nickel plating
References Arbeitsgemeinschaft - Galvanotechnik
AHC Oberflächentechnik
Blasberg Oberflächentechnik GmbH
Selectron Metalpålægning
Price notes Compared to nickel plating, electroless nickel is more expensive: about 50 percent more expensive. The reason is the frequent changes of the chemical bath (every 6-7 turnovers; see additional information).
These values are just indicative.
DKK/part 5 parts 100 5000
Small (1cm2) 126 16.5 0.133
Medium (1dm2) 177 34.5 1.36
Large (100dm2) 453 277.5 117
Price date March 1997
Environmen- tal notes The process uses very little electrical energy, except that required for maintaining the electrolyte temperature.
Additional info If a bath contains X g nickel (e.g. X=500 g), a turnover is the time required for depositing X g nickel on the coated parts. The turnover depends on the utilisation of the bath, and can vary according to production necessities.
Photo Thomas Nissen (Computer graphics)
Copyright © 1996-2003 Torben Lenau
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