Acorn Surface Technology
IVD Aluminium Vacuum Coating
(a Chemical Vapour Deposition Process)

IVD coated detail components
Acorn Surface Technology now has both NADCAP and AIRBUS approval for the IVD Process.

Physical Ion Vapour Deposition, known as IVD or Ivadising, is a Vacuum deposition process which is applies a pure Aluminium coating to various substrates, to improve the resistance to atmospheric and bi-metallic corrosion. IVD is an ideal means of coating metals such as titanum with an aluminium, which avoids the risk of the metals creating adverse conditions. Vapour Deposition is a means of implementing hard surfaces, under pressure and heat, onto Aluminium and other alloys. 

The manufacture of modern aircraft demands the use of high performance materials and protective systems which also need to be environmentally friendly. Historically Cadmium plating has been the mainstay for protecting both Steel and Aluminium components but, following increased environmental concerns and recent legislation, it is increasingly being replaced. 
Many alternatives to Cadmium have been investigated over the years but none have fulfilled all the requirements, however IVD Aluminium has emerged as the leading single process replacement in many applications. 

IVD Aluminium is a smooth, uniform coating of pure aluminium, produced by vacuum deposition and is currently used in  aerospace and defence  applications where critical corrosion resistance with electrical conductivity is paramount or where dissimilar metal contact can cause galvanic attack. 
Typical components currently processed with an IVD Aluminium coating include – Engine and Airframe fasteners (Steel and Titanium), high tensile Steel airframe parts, Titanium bearing shells, landing gear components and assemblies, sintered magnets and electrical connectors. 

  • IVD Aluminium has the following advantages:
  • Provides sacrificial corrosion protection to Steel without the risk of hydrogen embrittlement.
  • Provides improved corrosion protection to high strength Aluminium alloys.
  • Can be used in contact with aero engine fuels.
  • Neither the process nor the coating create toxic materials.
  • Corrosion resistance is at least equal to that of Cadmium.
  • Prevents dissimilar metal corrosion e.g. Ttitanium, Stainless  Steel parts in Aluminium assemblies
  • The coating can be applied within closely controlled limits.
  • Class 1 > 25 microns; Class 2 - 13-25 microns; Class 3 - 8-13 microns
  • The coating is highly conducting.
  • It is stable up to 415degC.
We have approvals from all the large OEMs. See our Approvals page for more details. 

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(previously Acorn Surface Technology Ltd)

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