Niplate® 600 SiC – Electroless Nickel-SiC

Niplate 600 SiC is a composite medium phosphorus (5-9%) electroless nickel plating with silicon carbide grains (SiC) in 20-30% concentration.

Main properties of SiC nickel SiC


Extreme hardness, up to 1100 HV
The ceramic particles of SiC and the hardening treatments performed after nickel plating permit increasing the hardness of the layer up to 1100 HV.

Very high wear resistance
Thanks to the tenacity of the electroless nickel matrix and to the extreme hardness of the ceramic particles of SiC, the Niplate 600 SiC coating has greater abrasive and adhesive wear resistance than that of hard chrome.

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.

Immagini

Technical specifications

Composition and applicable standards

Composition
Matrix Particles
Ni P SiC 1÷3µm
91÷95% 5÷9% 20÷30% vol.
Composite coating with medium phosphorus electroless nickel matrix and silicon carbide particles.

RoHS Conformity
RoHS conform. No substances with use restrictions beyond max tolerated concentration.

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
10÷30µm ±10% (min. ±2µm)
Uniform thickness over entire external and internal surface.
Absence of point effect typical of galvanic coatings.

Aesthetic appearance
Smokey grey metal appearance due to the high content of SiC particles. Morphology similar to machined piece.
Matt finish option (Sandblasting, shot-peening or shotblasted)
On request, possibility of obtaining a electroless-nickel metal appearance option.
Matt finish option (Sandblasting, shot-peening or shotblasted).
In case of hardening treatment, layer discolouring could occur:
• 270-280°C, white colour with possible yellow halos
• 340°C, iridescent blue-red colouring

Tribological properties

Hardness
Niplate 600 SiC has a very high hardness, a combination of electroless nickel matrix and ultra-hard ceramic particles. This varies according to the hardening heat treatment performed after layer deposition.
Hardness value Heat treatment
700±50HV Dehydrogenation 160-180°C x 4 hrs
850±50HV Hardening 270-280°C x 8 hrs
1050±50HV Hardening 340°C x 4 hrs

Wear resistance
Niplate 600 SiC has extreme abrasive and adhesive wear resistance, superior to that of hard chrome, thanks to the high content of ultra-hard silicon carbide particles.
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
1.0±0.1 mg / 1000 cycles Dehydrogenation 160-180°C x 4 hrs
0.8±0.1 mg / 1000 cycles Hardening 270-280°C x 8 hrs
0.6±0.1 mg / 1000 cycles Hardening 340°C x 4 hrs

Friction coefficient
Dynamic dry friction coefficient value
0.5 ÷ 0.8 depending on antagonist material

Chemical properties

Corrosion resistance
The corrosion protection of Niplate 600 SiC, 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
≥180 hours Carbon steel
≥240 hours Aluminium 6082

Chemical resistance
For application where high chemical resistance is required Niplate 500 is recommended in place of Niplate 600 SiC. Niplate 600 SiC does in any case have good chemical resistance above all in alkaline environments.
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

Weldability
Easily braze weldable using RMA, RA acid flow agents

Ferromagnetism
Presence of ferromagnetism Heat treatment
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
870°C

Density
6.8 g/cm3

Production facility