1. Home
  2. Treatments
  3. Electroless nickel plating

Electroless nickel plating

The strengths of the high phosphorus electroless nickel plating process (enp1012)

The electroless nickel plating treatment allows the chemical deposition of a layer of nickel on pieces immersed in the nickel plating bath.

The deposit thus obtained has high resistance to corrosion and wear, with perfectly uniform deposition.

Advantages

  • High corrosion resistance
  • Hardness between 450 and 1000 hv
  • Deposition uniformity
  • Absence of point effect
  • Resistance to wear
  • Non-allergic
  • Use in the pharmaceutical and food production sectors
  • Weldability
  • Electrical conductivity
The hardness of the deposit is between 450 and 1000 hv in relation to the temperatures applied during heat treatment. The so-called “point effect” is completely absent, and therefore pieces may be assembled without any subsequent mechanical processing. It preserves, improves and confers electrical conductivity to the article, at the same time guaranteeing weldability.
The high phosphorus electroless nickel deposit does not cause allergic responses in subjects that are predisposed, and is therefore normally used in the pharmaceutical and food production sectors. This latter characteristic is guaranteed by the attainment of nsf certification.

The largest system in the world in terms of surface area and production capacity: processing weights of up to 58 tonnes with maximum dimensions in excess of 5 metres.

Deltar offers the possibility of repairing nickel plated articles that have been subject to either accidental damage or post-nickel plating mechanical processing.

Find out more on reparations on the field

in addition, deltar has a system dedicated solely to nickel plate stripping in order to guarantee solely the removal of the deposited nickel film.

Find out more on nickel plate stripping

Nickel plating: general description of the process

The high phosphorus electroless nickel plating process (enp1012) is aimed at creating deposits with high resistance to corrosion and wear, with antifriction properties.

This is a chemical deposition process, occurring by means of an oxidoreduction reaction, without the aid of electrical current. Therefore, the normal equipment required for galvanic deposits is not necessary, and deposition can be achieved on any substrate and any geometry.

Deposit distribution and characteristics

The scope of the high phosphorus electroless nickel plating process (enp1012) is to create deposits with high resistance to corrosion and wear, with antifriction properties.
This is a chemical deposition process, occurring by means of an oxidoreduction reaction, without the aid of electrical current. Therefore, the normal equipment required for galvanic deposits is not necessary, and deposition can be achieved on any substrate and any geometry.

Physical and chemical characteristics

High phosphorus electroless nickel plating (enp1012) represents the prime coating process for guaranteeing not only corrosion resistance, but also the increased hardness of the coated piece.

Hardness

It is possible to increase hardness by implementing heat treatment up to 400°c for a period of time to be defined according to the client's processing specifications.
Phosphorus content (% by weight) > 10
Melting point °C 880 - 960
Vickers hardness hv 50 25 microns of thickness on steel without heat treatment 500 - 600
With heat treatment up to 1000

Corrosion behaviour

Saline spray tests have indicated that the electroless nickel coating is free from white and red rust patches after well over 1000 hours of exposure, with a coating of just 30 microns. On the other hand, using thicknesses upwards of 75 microns, it is possible to pass the kesternich test (h2s). This is thanks to the particular composition of deltar electroless nickel.
This is because deltar high phosphorus electroless nickel (enp1012) has a particular amorphous and non-crystalline microscopic structure. Without heat treatment, the high phosphorus electroless nickel deposit (enp1012) has a hardness of 500-600 hv, equal to the best hardened steels.

Coatable materials

The following materials may be coated:
  • Iron
  • High and low-alloy carbon steels
  • Cast iron
  • Copper and alloys thereof
  • Brass
  • Aluminium and alloys thereof
  • Plastic

Post nickel-plating heat treatments

The post-electroless nickel plating heat treatments used have three distinct aims:
  • Dehydrogenation
  • Increased adhesion
  • Hardening
The choice of treatment at the end of the nickel plating process is described in the client's specifications. Each heat treatment used is governed by international reference standards, such as astm b 733/15, nace 6a287, iso 4527 and others.
Iron/steel 180 - 200°C 2 - 4 hours 280 - 400 °C 1 - 8 hours
Cast iron 180 - 190°C 1 - 3 hours 280 - 400 °C 1 - 8 hours
Titanium and alloys 320 - 330°C 1 - 3 hours 280 - 400 °C 1 - 8 hours
Copper and alloys thereof 180 - 190°C 1 - 3 hours 280 - 400 °C 1 - 8 hours
Aluminium and alloys thereof 180 - 190°C 1 - 3 hours 280 - 350 °C 3 - 8 hours
Nickel alloys 220 - 240°C 1 - 3 hours 280 - 400 °C 1 - 8 hours

Our company

Electroless nickel plating

Certifications pdf

Electroless nickel plating

The electroless nickel plating treatment allows the chemical deposition of a layer of nickel on pieces immersed...

DELSIC

Electroless Nickel-Silicon Carbide (NiSiC) co-deposition endows the coated piece with increased hardness...

D-Shield

Deltar-Shield was realized to obtain a topcoat with high corrosion resistance...

Nickel PTFE

Nickel PTFE is a co-deposit consisting of high phosphorous electroless nickel…

Touch UP

Touch up repairs arise from the need to be able to coat exposed areas resulting...

Sixeal®

Sixeal® offers numerous advantages for metal to metal applications...

Electroless nickel plating

DELTAR CO-DEPOSITION SRL
Stabilimento: Via F.lli Rosselli 10 – 20068 Peschiera Borromeo (Milano)
Quality
First

DELTAR CO-DEPOSITION SRL
Via F.lli Rosselli 10 - 20068 Peschiera Borromeo (Milano)
Sede legale: Via Pietro Mascagni 24 - 20122 Milano
info@deltar.it tel. +39 02 55305101 fax +39 02 99990042
P.I. 12306070157 - Privacy policy