HEAT TREATMENT, STRESS RELIEVING / NORMALISING, DIFFUSION, INCREASED HARDNESS, HYDROGEN EMBRITTLEMENT

DIFFUSED NICKEL PLATING

 

In ENP terms when you’re looking for corrosion protection,
Diffused Nickel Plating or “DNP” really is the gold standard.

Diffused Nickel Plating has all the benefits of Electroless Nickel Plating and more. A specific type of Heat Treatment is employed after the initial plating, to improve the corrosion resistance of Electroless Nickel plating, meeting the demands of more extreme environments.

DNP has been, and continues to be favoured by the oil and industry for a number of years. By incorporating the corrosion resistant properties of Electroless Nickel Plating with the added benefits of Heat Treatment to produce Diffused Nickel Plating, it is possible to extend the operational life of subsea components up to 30 years.

PROCESS

High Phosphorous Diffusion Electroless Nickel is an Electroless Nickel deposit which diffuses, after a specific Heat Treatment, into the carbon steel substrate resulting in a very high corrosion and wear resistance in very severe conditions such as offshore or subsea.

After the application of a layer of High Phosphorous ENP typically 80-100 microns, the components are subjected to a very specific and tightly controlled heat treatment in order to achieve a diffusion layer of 3-5 microns.

This offers a very slightly flexible coating with superior corrosion resistant qualities.

Heat Treatment at 610°C: average diffusion layer thickness of 3 to 5 µm.

After Heat Treatment in an atmospheric oven, a typical olive-green colour appears. In an oven with inert gasses or under vacuum, the deposit maintains its metallic aspect.

CBE+ Diffused Nickel Plating process is the highest standard for corrosion resistance via the plating process.

PROPERTIES
  • Highest levels of corrosion resistance.
  • Cheaper alternative to stainless steel.
  • Ideal for marine environments.