Niplate® 500 – High Phosphorus Electroless Nickel

Niplate 500 is a high-phosphorus electroless nickel plating (10-13% in P). It is preferable to other Niplate coatings in case of contact with foods and when resistance to aggressive chemical agents is required.

Main properties of high-phosphorus electroless nickel

Excellent chemical and corrosion resistance
Thanks to the high chemical resistance of the coating and complete surface covering, the pieces treated with Niplate 500 are protected against corrosion and aggressive chemical substances.

Uniform thickness
Uniform and constant thickness over the entire surface, including holes, ideal for precision mechanical engineering pieces with reduced tolerances.

Applicable on various metals
All the most common alloys used in mechanical engineering can be coated - iron, copper and aluminium alloys.


Technical specifications

Composition and applicable standards

Ni P
87÷90% 10÷13%
Ni-P alloy with high phosphorus content

MDS Report
IMDS ID: 359192271

Product technical standards
ISO 4527 | NiP(11)
ASTM B733 | Type V

NSF-51 Certification
Certified NSF 51 - Food equipment material

RoHS Conformity
RoHS conform. No restricted-use substances beyond maximum tolerated concentrations.

REACh Conformity
REACh conform. No SVHC in quantities greater than 0.1% by weight.

Coatable metals

Coatable metals
Iron alloys Pre-treatment Adhesion
Corrosion resistance
Carbon steel - ★★★★★ ★★★☆☆
Stainless steel Sandblasting ★★★★☆ ★★★★★
Case-hardened steel Sandblasting ★★★★☆ ★★★☆☆
Nitrided steel Sandblasting ★★★☆☆ ★★★☆☆
Copper alloys
Brass, Bronze, Copper - ★★★★★ ★★★★★
Aluminium alloys
Wrought alloys - ★★★★☆ ★★★★☆
Foundry and die-casting alloys - ★★★★☆ ★★★☆☆
Titanium alloys
Pure titanium and titanium alloys Sandblasting ★★★★☆ ★★★★★

Coating thickness and aesthetic appearance

Coating thickness
Nominal thickness, optional Tolerance
3÷50µm ±10% (min. ±2µm)
Uniform thickness over the entire external and internal surface
Absence of the point effect typical of galvanic coatings

Aesthetic appearance
Bright stainless steel metal appearance with morphology similar to machined piece
Matt finish option (sandblasted, shot-peened or shotblasted)
In case of hardening treatment, layer discolouring could occur:
• 270-280°C, white colour and possible yellow halos
• 340°C, iridescent blue-red colour

Tribological properties

The surface hardness of Niplate 500 varies according to the hardening heat treatment performed after layer deposition.
Hardness value Heat treatment
550±50HV Dehydrogenation 160-180°C x 4 hrs
800±50HV Hardening 270-280°C x 8 hrs
1000±50HV Hardening 340°C x 4 hrs

Wear resistance
For applications where the part undergoes wear, the use is recommended of Niplate 600 instead of Niplate 500. Niplate 500 nevertheless has good wear resistance depending on the heat treatment performed.
Approximate wear value, TWI-CS10 Heat treatment
A low number indicates a better performance - ASTM B733 X1 - Taber Abraser wear test - abrasive wheels CS 10 - load 1 kg
20±2 mg / 1000 cycles Dehydrogenation 160-180°C x 4 hrs
17±2 mg / 1000 cycles Hardening 270-280°C x 8 hrs
12±2 mg / 1000 cycles Hardening 340°C x 4 hrs

Friction coefficient
Dynamic dry friction coefficient value
0.4 ÷ 0.6 depending on antagonist material

Chemical properties

Corrosion resistance
The corrosion protection of Niplate 500, assessed by means of salt mist test, depends on the base material, piece machining and finishing and the thickness of the applied coating.
Approximate corrosion resistance values Base material
NSS according to ISO 9227 - Thickness 20 μm - corroded surface < 5%
≥1000 hours Brass
≥240 hours Carbon steel
≥240 hours Aluminium 6082

Chemical resistance
Excellent chemical resistance and to oxidization in many aggressive salt environments.
Passes the concentrated nitric acid immersion test (RCA, Nitric acid test - Concentrated nitric acid 42Bé, 30 seconds, room temperature).
Chemical compatibility
Approximate values of compatibility with the coating environment only, they do not indicate corrosion protection of the base material. The overall performance of the coated piece depends to a large extent also on the type and quality of the base material. The actual resistance to the environment must in any case be tested in the field.
Hydrocarbons (e.g. petrol, diesel fuel, mineral oil, toluene)
Alcohols, ketones (e.g. ethanol, methanol, acetone)
Neutral saline solutions (e.g. sodium chloride, magnesium chloride, brine)
Diluted reducing acids (e.g. citric acid, oxalic acid)
Oxidizing acids (e.g. nitric acid)
Concentrated acids (e.g. sulphuric acid, hydrochloric acid)
Diluted bases (e.g. diluted sodium hydroxide)
Oxidizing bases (e.g. sodium hypochlorite)
Concentrated bases (e.g. concentrated sodium hydroxide)

Physical properties

Easily braze weldable using RMA, RA acid flow agents

Presence of ferromagnetism Heat treatment
Non ferromagnetic Dehydrogenation 160-180°C x 4 hrs
Ferromagnetic Hardening 270-280°C x 8 hrs
Ferromagnetic Hardening 340°C x 4 hrs

Melting point, solidus

7.9 g/cm3

Production facility