NIPOX95 chemical nickel plating treatments are ideal for protecting the surfaces of mechanical parts.
USED FOR DIFFERENT MATERIALS
This is a shining chemical nickel coating with a high phosphorus content (11- 13%). The metals on which this type of coating can be applied (as with all treatments of the NIPOX family) are varied:
- Iron and steel
- High-alloy or stainless steel
- Hardened steels
- All aluminium alloys, including die-cast and non-anodizable alloys
- Brass and copper
- Excellent corrosion resistance
- Compliance with dimensional tolerances
- Excellent hardness (from 500 to 1000 HV)
- Excellent wear resistance
- Suitable for use in the Food and Beverage industry
The surface hardness NIPOX 95 (over 500 HV) improves the tribological properties of the mechanical parts on which it is deposited.
In addition, greater hardnesses can be achieved by means of appropriate heat treatments; hardening at 270-300°C gives the treated surface a hardness of 750-850 HV, while treatment temperatures of 350-400°C produce hardnesses of 900-1000 HV.
Nickel-Teflon is a composite system of chemical nickel plating and Teflon particles (PTFE), which while maintaining the same characteristics as Nipox95 permits obtaining a sliding and non-stick surface.
Nickel-teflon incorporates in the Nickel matrix a suitable percentage of Teflon particles, a material chemically inert in the presence of corrosive substances, with a high softening point (about 300°C) and which, when applied to a hard substrate, has the lowest coefficient of friction of any other polymer:
To meet the need to give the sliding couplings greater resistance to corrosion and wear, the contact surfaces are often coated with hard chrome and nickel-phosphorus alloys. These are both very hard materials with a low coefficient of friction; however, if the lubrication is defective or even absent, they cause wear and seizure of the coupled material.
In the case of dry lubrication, substances such as graphite, molybdenum disulphide or teflon (PTFE) are often used.
The latter material, interesting in terms of its particular properties, is widely used in sliding couplings.
The decision was therefore taken to use nickel-phosphorus, which is very suitable as a material incorporating PTFE, thus obtaining a hard coating with high self-lubricating power.
CHARACTERISTICS AND VALUES OF NICKEL-TEFLON
Teflon particles, used to lower friction coefficients and give the layer self-lubricating power, have been uniformly incorporated into the Ni-P matrix.
So that, in situations of sliding between surfaces, PTFE particles are not removed but slowly consumed as the coating thickness becomes thinner.
Therefore, the solid PTFE, present throughout the coating layer, makes it possible to maintain a low coefficient of friction for a very long period of work and abrasion is greatly reduced even when the coating is made on a single contact surface.
The mechanical properties of Nickel-Teflon coating are a compromise between those of Nipox95 and those of Teflon. The average hardness measured with a microdurometer is about 250 HV which can reach a maximum value of 400 HV depending on the heat treatment after coating.
However, to get an idea of the wear resistance and/or the duration of this process, these values are not sufficient.
To these must be added the very low coefficient of friction (0.08 – 0.10) with high resistance to corrosion and good hardness typical of the chemical nickel matrix.