Niplate 500 is a high-phosphorus (10-13% in P) electroless nickel plating. Among electroless nickel platings, Niplate 500 offers the best chemical and corrosion resistance and should be chosen over the other Niplate coatings for food contact applications.
Thanks to its high phosphorus contents, the high-phosphorus electroless nickel plating alloy has an amorphous structure. This property imparts high chemical resistance in respect of highly aggressive agents such as oxidizing acids. The amorphous structure means that the alloy is non-ferromagnetic and thus not attracted by magnetic fields.
Hardening treatments transform the film structure from amorphous to microcrystalline. They increase film hardness up to 1000 HV, but they reduce chemical resistance slightly and make the layer ferromagnetic.
Niplate 500 features very low porosity, even with thin coatings. This allows effective corrosion protection of the substrate material, especially in the case of parts made of iron or aluminium alloys.
Thanks to the high chemical resistance and absence of coating porosity, parts treated with Niplate 500 offer high salt spray corrosion resistance and blackening resistance.
Uniform and constant coating thickness over the entire surface, including holes; ideal for precision machined parts with tight tolerances and complex geometries.
All metals commonly used in mechanical engineering practice can be coated: alloys of iron, copper, and aluminium.
|Ni-P alloy, high phosphorus electroless nickel plating|
|ISO 4527 | NiP(11)|
|ASTM B733 | Type V|
|NSF 51 certification|
|NSF 51 certification – Food equipment material.|
|RoHS compliant. No restricted substances present in amounts greater than the maximum tolerated concentrations.|
|REACH compliant. No SVHCs present in amounts higher than 0.1% by weight.|
|Stainless steel||Pre-treatment||Sand blasting|
|Case hardened steel||Pre-treatment||Sand blasting|
|Nitrided steel||Pre-treatment||Sand blasting|
|Brass, Bronze, Copper||Adhesion||★★★★★|
|Pure titanium and titanium alloys||Pre-treatment||Sand blasting|
|Nominal thickness, as required||Tolerance|
|3÷50µm||±10% (min. ±2µm)|
|Uniform thickness over the entire external and internal surface|
|Absence of tip effect typical of galvanic coatings|
|Bright stainless steel metallic appearance that reproduces the morphology of the machined part|
|Option of matt finish (sand blasted, shoot peened, or grit blasted)|
|Hardening treatments may result in discolouration of the coating:|
• 340°C, iridescent blue-red colouring
|The surface hardness of Niplate 500 varies in relation to the hardening heat treatment carried out after deposition of the coating.|
|Hardness value||Heat treatment|
|550±50HV||Hydrogen embrittlement relief at 160-180°C for 4h|
|1000±50HV||Hardening at 340°C for 4h|
|For applications in which the part is subject to wear, the use of Niplate 600 is recommend in place of Niplate 500. Niplate 500 anyway offers a good level of wear resistance, depending on the heat treatment carried out.|
|Guideline wear value, TWI-CS10||Heat treatment|
|The lower the number, the higher the performance – ASTM B733 X1 – Taber Abraser wear test – CS 10 abrasive wheels – 1 kg load|
|20±2 mg / 1000 cycles||Hydrogen embrittlement relief at 160-180°C for 4h|
|12±2 mg / 1000 cycles||Hardening at 340°C for 4h|
|Dynamic dry friction coefficient value|
|0.4 ÷ 0.6 depending on the antagonist material|
|The corrosion protection of Niplate 500, measured by the salt spray test, depends on the substrate metal, machining and finish of the part, and on the applied coating film thickness.|
|Guideline corrosion resistance values||Substrate material|
|NSS to ISO 9227 – Thickness 20 μm – corroded surface < 5%|
|≥240 hours||Carbon steel|
|≥240 hours||Aluminium 6082|
|Excellent chemical and oxidation resistance in highly aggressive saline environments.|
Passes the concentrated nitric acid immersion test (RCA nitric acid test: 42 degree Bé concentrated nitric acid, 30 seconds, ambient temperature).
|Chemical compatibility values are referred exclusively to the coating and do not define the corrosion protection of the substrate material. The overall performance of the coated part is highly dependent also on the type and quality of the substrate material. The actual environmental resistance must anyway be tested in the field.|
|Hydrocarbons (e.g. petrol, diesel, mineral oil, toluene)|
|Alcohol, ketones (e.g. ethanol, methanol, acetone)|
|Neutral saline solutions (e.g. sodium chloride, magnesium chloride, seawater)|
|Dilute reducing acids (e.g. citric acid, oxalic acid)|
|Acid oxidizing agents (e.g. nitric acid)|
|Concentrated acids (e.g. sulphuric acid, hydrochloric acid)|
|Dilute bases (e.g. dilute sodium hydroxide)|
|Base oxidizing agents (e.g. sodium hypochlorite)|
|Concentrated bases (e.g. concentrated sodium hydroxide)|
|Easily brazed using RMA, RA acid fluxes|
|Non-ferromagnetic||Hydrogen embrittlement relief at 160-180°C for 4h|
|Ferromagnetic||Hardening at 340°C for 4h|
|Fusion point, solidus|