The electroless nickel plating process that produces a coating highly resistant to corrosion and wear and that is uniform on any geometry.
The NIPLOY Process is an electroless nickel plating system with medium or high phosphorus content which allows us to obtain coatings with high corrosion and wear strength.
One essential feature of the process is the uniformity of the coating, regardless of the complexity of the geometry of the part, which is allowed by the absence of external currents which also prevents brittleness of the base material. These features make it the ideal treatment for standard electroless nickel plating, and also make it the perfect base for our more specific treatments, CHENISIL and CHENIFLON.
Application of the NIPLOY Process not only increases the life of the pieces due to its corrosion and wear strength characteristics, but it also allows less noble and expensive, though easier to machine, materials to be used (compared to stainless steels, for example), gaining in weight by replacing heavy alloys with light alloys. This offers significant practical and economic advantages. Niploy coating also lends itself well for use with brazing with tin-lead alloys, as well as a base for subsequent coating with precious metals.
The technical ability of ARGOS is that of being able to apply its coatings on parts ranging from micromechanics (pins, pharmaceutical needles, etc.) to pieces of complex geometries and significant sizes (bases and structures up to 3x3m, shafts and cylinders up to 5 m in length by 1 m in diameter), with variations in weight ranging from less than 1 gramme up to 15 tons.
In addition to its nickel plating plants, ARGOS also has its own internal systems for the preliminary processes, such as micro-sandblasting, micro-shot-peening, vibration polishing, shotblasting, masking, etc., as well as for the final processes, such as heat treatments, polishing, etc.
Magnetic sensitivity, Conductivity
NIPLOY allows us to get a uniform thickness on pieces of any shape, even with complex geometries, eliminating the need for subsequent and expensive mechanical finishing such as, for example, final grinding.
This provides excellent protection of internal areas, such as holes or cavities, and a total respect for the basic roughness without requiring final grinding.
Furthermore, thanks to its excellent adhesion to the substrate, the NIPLOY coating does not tend to flake off even when highly stressed and where it sustains mechanical damage, unlike galvanic deposits (such as chromium), and does not allow corrosion or delamination phenomena, even in case of microporous materials, unless it depends on the material characteristics (aluminium, for example).
Niploy process, chemical nickel treatment, differs between medium and high phosphorus content in the following percentages:
average phosphorus: 6-9
high phosphorus: >10
Regularity of the coating on a razor blade. Thickness = 50 microns.
Homogeneity of the deposit on the base of the thread.
The coating structure generated by the NIPLOY process, together with the high presence of phosphorus, generates a surface of exceptional corrosion strength.
This allows the procedure to be applied in place of stainless steel, even in sectors such as food and pharmaceutical, areas where Argos has also obtained process compliance certifications.
The resistance to wear due to fretting contact is comparable with that of hard chrome. Its very high thermal shock resistance is also outstanding, meaning there are no cracks in a change from 200 ° to -190°.
Hard chrome no. pores
Niploy Process no. pores
The basic values of the NIPLOY Process electroless nickel plating coating are approximately 500HV (50/52HRC).
However, it is possible to increase this hardness through heat treatment between 250 and 350°C.
This allows the coating to be hardened well beyond its basic values, going in proportion to the treatment temperatures chosen from 600HV (54/56HRC) until reaching 1100HV (70/72HRC), much higher than those of hard chrome and even comparable to some ceramic coatings.
All of this is possible while also offering greater corrosion strength than the latter.
Comparative table of the wear indexes of the chemical nickel coating at various hardnesses.
TABER WEAR INDEX
12 – 13
Phosphorus confers its excellent self-lubricating properties to the NIPLOY Process coating, ensuring a very low friction coefficient.
The NIPLOY Process perfectly welds to silver and tin-lead alloys.
Very thin layers, below 10 microns, also permit welding stainless steel and aluminium.
Nickel plating coating is by and large non-magnetic for high phosphorus and slightly magnetic for medium phosphorus.
The material has good thermal conductivity and moderate electrical conductivity.
Coefficient of expansion
60 micro-Ohm cm2/cm (at ambient temperature) depending on the heat treatment carried out.
Non-magnetic. Slightly magnetic after heat treatment.
During the NIPLOY coating process the temperature reaches 95°C* at the most
Good heat conductor, discrete electrical conductor.
* Although the temperature of the dehydrogenation heat treatment (about 150° – 200°, depending on the material treated) should be taken into account, it is usually carried out in order to ensure better adhesion to the substrate.
Food: sleeves, rods, valve bodies and miscellaneous taps, drink and beer dispensing systems, extruders, boilers, pipes, spouts, heat exchangers for coffee machines, mouths and augers for meat grinders, rotors and valves for dispensing powder and flour, pinions and parts for fruit and vegetable washing and sorting systems. Pharmaceutical: sheets, folders, strips, sealing bars, metering units for filling machines (solids/liquids/creams), cartoning machines, thermoforming machines, blistering machines, capsuling machines.
Automotive: cores and rods for injector bodies of LPG/methane sector, pins and linkages for windshield wipers, injectors, cylinder heads, cylinders, pistons. Motorcycles: pulleys, fixed and mobile clutch/hub bell housings, shock absorbers for motorcycles and quadricycles.
Components for relays, automatic cut-out switches, shafts, drive shafts, pins.
HYDRAULIC AND PNEUMATIC
Crane/lift truck journals, valve/piston bodies and stems for hand pumps, gears, pistons, cylinders.
PETROCHEMICAL, OIL & GAS, NUCLEAR
Balls, bodies, stems, spacers, seats.
MOULDS FOR PLASTIC / GLASS
Inner bodies, outer bodies, layers.
Pliers and thread guides, washers, pulleys, sliding surfaces, taping machines for fabric processing, shells, plates, sinker rings, covers.
Notes: to prevent leakage of impurities from the assembly area, nickel plating of assembled parts is not recommended. Some alloys and materials are also incompatible with the treatment. The parts must be supplied free of impurities and oily residue. If necessary or requested, they can be carried out with preparation operations such as guards or masking, and also micro-sandblasting, micro-shot-peening, ultrasonic cleaning even for large sizes, etc. It is advisable to talk to ARGOS technicians for any details, questions or advice regarding the operations described above.
Chemical nickel and Teflon together for a self-lubricated surface: maximum smoothness with exceptional lifetime.
A combination of chemical nickel and silicon carbide to achieve surfaces of extraordinary hardness: the ultimate answer to problems of wear due to fretting contact.
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