Chemical nickel coating as functional protection of metallic surfaces

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Technology abstract

A german company is offering a chemical nickel coating as functional protection of metallic surfaces. The surface refinement process is used for:

  • guarantee electromagnetic compatibility (EMC).
  • as corrosion protection.
  • to prevent sedimentation (insulation effect).
  • as abrasion protection.

The company offers contract coating as a service.

Technology Description

In aerospace technology, the surfaces of certain components or component groups are coated with chemical nickel layers.
 
When solid lubricants such as PTFE (Teflon) and boronite are embedded in a nickel matrix (chemical nickel dispersion layers), the process can also be used for sliding coating (coefficient of friction < 0.1). The resulting dry lubrication layers have a temperature resistance of up to 295°C for chemical nickel PTFE and up to 670°C for chemical nickel boronite.
 
The chemical nickel layers are deposited "without external current" from aqueous solutions at a maximum temperature of 90°C. The layer is an alloy layer of nickel and phosphorus. Nickel is deposited on a metal surface by reduction.
 
Virtually any metallic base material can be coated with an adhesive coating, e.g.:

  • Steel: hardened or unhardened; low or high alloyed.
  • Non-ferrous metals: aluminium, copper and copper alloys.

 
fields of application

  • Polymer processing industry
  • Mould and tool making; e.g. as demoulding aid in plastics processing
  • Medical Technology
  • Mechanical engineering, plant and apparatus engineering
  • Measurement technology.

 
The chemical nickel dispersion layers are also suitable for the following applications:

  • Corrosion protection of external surfaces and temperature control systems.
  • Wear protection against abrasion (approx. 780 HV / annealed 1,150 HV).
  • Wear protection of soft base materials (aluminium, copper alloys).
  • Wear protection polish (approx. 740 HV / annealed 1,150 HV).
  • Generation of sliding surfaces with low coefficients of friction for permanent lubrication.

 

 

Innovations & Advantages

  • the maximum coating temperature is 90°C, therefore the coating can be applied absolutely distortion-free
  • almost any metallic base material can be coated without affecting its structure or other properties
  • most accurate moulding of the surfaces. The surface structures are retained and there is no edge build-up
  • Deposits also in bores and ribs to the desired dimension
  • layer thickness variations are approx. 4% of the layer thickness
  • decoating is possible (chemical)
  • all environmental requirements are fulfilled (state of the art)

freely selectable layer thicknesses for each application.

Current and Potential Domains of Application

fields of application

  • Polymer processing industry
  • Mould and tool making; e.g. as demoulding aid in plastics processing
  • Medical Technology
  • Mechanical engineering, plant and apparatus engineering
  • Measurement technology.

 
The chemical nickel dispersion layers are also suitable for the following applications:

  • Corrosion protection of external surfaces and temperature control systems.
  • Wear protection against abrasion (approx. 780 HV / annealed 1,150 HV).
  • Wear protection of soft base materials (aluminium, copper alloys).
  • Wear protection polish (approx. 740 HV / annealed 1,150 HV).
  • Generation of sliding surfaces with low coefficients of friction for permanent lubrication.