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It is the surface that gives the base material its final functional and optical properties.

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Precious metals

Precious metals

Precious metals

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Processes

Precious metals

With gold, silver, palladium, ruthenium, rhodium and platinum, finishes are created in the truest sense of the word. An elegant appearance, properties such as high electrical conductivity, wear resistance, good solderability and excellent tarnish resistance make these valuable precious metals indispensable for coatings on connectors and contacts in electronics all the way to slip rings in the wind power industry.

In addition to pure metal layers, precious metal alloys are also deposited through galvanisation. With our in-house developed methods, it is possible to deposit the proportions of the individual alloy elements in defined bandwidths, which enables the generation of special properties.

Collini Gold
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Advantage

Advantages at a glance

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Technical data

Compare processes
GoldPalladiumSilverRutheniumRhodium
Processesgalvanic gold coatings and gold alloy coatingsgalvanic palladium and palladium alloy coatingssilver systemsgalvanic processesgalvanic processes
Coating colouryellow to reddish, semi-glossy to glossywhite, bright glossywhite, light matt to glossylight grey to dark anthracite, matt to glossywhite, bright glossy
Base materialCopper and steel alloys, aluminium, magnesium, titanium on requestCopper and steel alloys, aluminium, magnesium, titanium on requestCopper and steel alloys, aluminium, magnesium, titanium on requestCopper and steel alloys, aluminium, magnesium, titanium on requestCopper and steel alloys, aluminium, magnesium, titanium on request
Corrosion protectionExcellent tarnish resistance and corrosion resistanceHigh tarnish resistance and corrosion resistance0.5-15 min. in the K2S test, depending on the type of passivationDue to micro cracks, taken over by the base layerHigh tarnish resistance and corrosion resistance
Hardness90 – 600 HVapprox. 220 – 600 HV80 – 110 HVapprox. 800 HV, brittle, so coatings are crackedapprox: 850 HV
Temperature resistanceHigh. To avoid copper diffusion due to constant temperature load, nickel, for example, is used as a barrier layerHigh. To avoid copper diffusion due to constant temperature load, nickel, for example, is used as a barrier layerHigh. To avoid copper diffusion due to constant temperature load, nickel, for example, is used as a barrier layerHighVery high
System technologyDrum, rack, bandDrum, rack, bandDrum, rack, bandRack, bandRack, band
ConformityRoHS, REACHRoHS, REACHRoHS, REACHRoHS, REACHRoHS, REACH
ExecutionGold-copper-cadmium, gold-cobalt, gold-silver, pure goldPalladium, palladium-nickel, palladium-nickel with gold coating, pure palladiumSilver inorganically or organically passivated, silver with galvanic coatingNatural or black ruthenium, over a very corrosion-resistant Ni base layer with a thin gold intermediate layerApplication-specific over a corrosion-resistant Ni base layer
From our R&DGalvatronic®, Duor®, Tribor®, Tribor 99®Optargen®
Protective propertiesProtection against tarnishing or corrosion due to thermal or chemical stress, wear protectionProtection against tarnishing or corrosion due to thermal or chemical stress, wear protectionProtection against tarnishing or corrosion due to thermal or chemical stress, wear protectionProtection against tarnishing or corrosion due to thermal or chemical stress, wear protectionProtection against tarnishing or corrosion due to thermal or chemical stress, wear protection
Functional propertiesConductive, solderable, bondable, contact surface for contact resistance, good conductivity, solderability, good bondabilityConductive, solderable, bondable, contact surface for contact resistance, good conductivity, solderability, good bondabilityConductive, solderable, bondable, contact surface for contact resistance, good conductivity, solderability, good bondabilityConductive, solderable, bondable, contact surface for contact resistance, good conductivity, solderability, good bondabilityConductive, solderable, bondable, contact surface for contact resistance, good conductivity, solderability, good bondability
Decorative propertiesDepending on the coating system, homogeneous technical or decorative surface, matt to glossyDepending on the coating system, homogeneous technical or decorative surface, matt to glossyDepending on the coating system, homogeneous technical or decorative surface, matt to glossyDepending on the coating system, homogeneous technical or decorative surface, matt to glossyDepending on the coating system, homogeneous technical or decorative surface, matt to glossy
Special propertiesBright gold: high optical reflectancePartially non-magneticMagnetic resonance properties for special applications in medical technology
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Details

Typical components & applications

Typical components

Contact applications with low contact resistance, contact housing applications with decorative requirements, switching contact applications with high wear resistance, sliding contact applications with low contact resistance, plug contacts, bonding surfaces, reed contacts, slip rings, electrical contacts, connectors, micro-relays, RF components

Industrial applications

Electrical engineering, medical technology, wind power, crane technology, vehicle manufacturing, industrial robots, mechanical engineering

 

Precious metal surfaces at Collini

 

For precious metal coatings, Collini offers all the common precious metal surfaces, such as silver, gold, palladium, rhodium and ruthenium. Our speciality is gold and silver coatings.

 

Pure gold & hard gold

Collini offers a wide variety of gold surfaces. Pure gold (> 99.99% Au) with the highest ductility and elasticity for special applications. Hard gold (> 99.8% Au) with the alloy element of cobalt as the proprietary DUOR® process for multiple applications in the area of connectors and plugs. In the innovative Tribor® system, as an alternative to conventional Ni-Au surfaces, Duor® is deposited in a coating thickness of only 0.15 µm as contact gold on a corrosion and wear-resistant nickel alloy (Niphoplate®). Hard gold (approx. 75% Au) with the alloy elements of copper and cadmium as the proprietary Galvatronic® process, with its extraordinary properties in terms of wear resistance. Due to its possible elongation of up to 5%, this single-phase ternary gold allow can be deposited in coating thicknesses that are far higher than in conventional binary hard gold alloys) (AuCo, AuNi). These properties make Galvatronic® the ideal surface for sliding contact systems such as a slip ring for the wind power industry, for example, where relatively thick hard gold layers result in a long product life.

Pure silver & glossy silver

For silver surfaces, Collini offers high purity pure silver and glossy silver surfaces (< 99.99%). To prevent oxidation, Collini uses RoHS-compliant passivation systems. Optargen®, an in-house developed coating system, protects surfaces from environmental influences over the long term without impairing the functional properties of the surfaces. The base layer is also coated with an extremely thin nickel-free metallic allow layer. High-purity silver coatings can be coloured deep black at Collini in a downstream chemical process. This highly light-absorbing surface is used in the aerospace industry, amongst others.

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impressions

Collini Silber
Collini Gold
Collini Gold
Collini Gold
Collini Gold
Collini Gold
Collini Gold
Collini Silber
Collini Silber
Collini Silber
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Contact

Contact us








Christoph Eder

Managing Director

+41 (44) 824 38 38 send email ceder@collini.eu
Contact