Electroless nickel plating is an auto catalytic reaction, used to deposit a layer of nickel-phosphorous alloy on a base material. Unlike electroplating processes...
Electroless nickel plating is an auto catalytic reaction, used to deposit a layer of nickel-phosphorous alloy on a base material. Unlike electroplating processes, during electroless nickel plating, electric current is not necessary for the deposition of the surface layer. The advantage of this process is a uniform thickness of the deposited layer even on complicated shapes, in many cases removing the necessity for subsequent machining of the workpiece.
The deposited layer is highly corrosion resistant due to its low porosity and can be subsequently heat treated to achieve a hardness of up to 1000 HV. Electroless nickel plating is used in many different applications, particularly in applications demanding high hardness and corrosion resistance. Electroless nickel plating with heat treatment can be used in some applications as a non-toxic substitute for hard chrome plating. Bomex owns an electroless nickel plating line with the largest tanks in the Czech Republic.
We currently provide 2 types of electroless nickel plating. Plating with a medium content of phosphorus, which has excellent mechanical properties; and plating with a high content of phosphorus and with a strong resistance to corrosion and chemical damage.
MEDIUM PHOSPHORUS PLATING NiP
Content of phosphorus 5 - 9 %
Hardness of plating 550-660 HV (52-58 HRc)
Heat-treated hardness 840-1100HV (65-69HRc)
Abrasion resistance after plating 14-18 TWI
Abrasion resistance after heat treatment 8-12 TWI
Good corrosion resistance
Slightly magnetic plating
HIGH PHOSPHORUS PLATING NiP
Content of phosphorus 10 - 12 %
Hardness of plating 440-510 HV (45-50 HRc)
Heat treated hardness 770-1000HV (63-69HRc)
Abrasion resistance after plating 18-24 TWI
Abrasion resistance after a heat treatment 10-15 TWI
Excellent corrosion resistance
Non magnetic plating (before heat treatment)
Uniform layer even on irregularly shaped parts, does not require subsequent grinding
High hardness and abrasivity
Natural lubricity of the surface layer, static coefficient of friction on steel: 0.13 lubricated, up to 0.4 without lubricant
Deposit is non-toxic, suitable for medical and food-processing industry
Low hydrogen absorption, approximately 1/5 that of electrolytic nickel plating and 1/10 that of hard chrome plating
Good wettability for oils
Complies with ISO 4527, MIL-C-26074 (AMS 26074), AMS 2404, ASTM B-733
Complies with ELV, RoHS and WEEE directives
As plated hardness of 570-660 HV (53-58 HRc)
Optional heat treated hardness of up to 1000 HV (69 HRc)
Excellent corrosion resistance due to low porosity of deposited layer
High abrasion resistance
Semi-bright to bright appearance
3 - 80 µm
Lengths up to 2.3 m
Maximum weight of 250 kg
Iron and its alloys
Copper and its alloys
Electroless nickel plating is used in many industries and applications due to its properties, such as corrosion resistance, hardness, abrasion resistance and non-toxicity. Below are few examples of its use:
General industry: shafts, cylinders, mould cavities and a countless number of other parts
Automotive industry: brake pistons, caliper pins, transmission components, etc.
Oil, gas and chemical industries: flanges, tubes and pipes, pump components, valve bodies, etc.
A vast number of parts for electronics, aircraft, food processing and other industri