The electroless method of applying Nickel ensures completely even deposits, no edge build-up, excellent corrosion protection and creates a low friction surface. Typical coating thickness of 8-12 microns is standard, although other thickness is availabe on request. The high phosphorous content on our E-Nickel provides the high corrosion resistance and the ability to age-harden the layer from ± 450 Hv (~45 Hrc as-plated) to ± 950 Hv (~69 HRc). .
The higher phosphurous E-Nickel coatings have the advantage of:
- Low friction (vs steel: 0.38- dry, 0,21 – lubricated)
- Lower porosity (i.e. improved corrosion resistance)
- Low thermal expansion
Composite E-Nickel Coatings
Composit E-Nickel is e-nickel plated togther with fine particulates such as Teflon, Silicon Carbide, Boron Nitride or Diamond, and the combination of elements gives unqiue properties.
Our Metal Teflon Coating (MTC) coating is essentially an E-N coating with Teflon/PTFE particles. This is particularty important for the plastics industry where it is assists in plastic release and flow for complicated mould designs incorporating ribs and recesses. Plastic moulders have reported reduction in cycle time of between 4-8% using MTC. It is also used very succesfully on parts requiring a durable, dry running, low friction surface such as feeders, slides and shafts. MTC further has the advantage of a constant friction coefficient under a wide range of loads. Due to the electroless nature of the coating, internals and difficult geometries are easily coatable.
This coating is typically 10-15 microns in thickness and can be applied to aluminium, steel and copper. A uniform plating thickness develops wherever the solution contacts the part. Grooves, slots, threads and even the inside of tubing plates evenly.
Should a temperature resistance of more than 300°C be required, the Teflon can be replaced with Boron Nitride. The E-N/BN coatings have successfully been used to enhance release properties in complex moulds and offer moderate wear resistance, excellent lubricity and release properties which outperforms most other coatings.
Electroless Nickel can also be infused with Silicon Carbide. As the SiC is a very hard substance, it significantly improves wear resistance and it is an effective competitor to chrome plating, but without the limitiations of chrome plating with regards to edge built up and limited throwing power.
ref:Electroless Nickel Composite Coatings, Advanced Materials & Processes, May 2008 – find this excellent article in our downloads