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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
Gold Palladium Silver Ruthenium Rhodium
Processes galvanic gold coatings and gold alloy coatings galvanic palladium and palladium alloy coatings silver systems galvanic processes galvanic processes
Coating colour yellow to reddish, semi-glossy to glossy white, bright glossy white, light matt to glossy light grey to dark anthracite, matt to glossy white, bright glossy
Base material Copper and steel alloys, aluminium, magnesium, titanium on request Copper and steel alloys, aluminium, magnesium, titanium on request Copper and steel alloys, aluminium, magnesium, titanium on request Copper and steel alloys, aluminium, magnesium, titanium on request Copper and steel alloys, aluminium, magnesium, titanium on request
Corrosion protection Excellent tarnish resistance and corrosion resistance High tarnish resistance and corrosion resistance 0.5-15 min. in the K2S test, depending on the type of passivation Due to micro cracks, taken over by the base layer High tarnish resistance and corrosion resistance
Hardness 90 – 600 HV approx. 220 – 600 HV 80 – 110 HV approx. 800 HV, brittle, so coatings are cracked approx: 850 HV
Temperature resistance High. To avoid copper diffusion due to constant temperature load, nickel, for example, is used as a barrier layer High. To avoid copper diffusion due to constant temperature load, nickel, for example, is used as a barrier layer High. To avoid copper diffusion due to constant temperature load, nickel, for example, is used as a barrier layer High Very high
System technology Drum, rack, band Drum, rack, band Drum, rack, band Rack, band Rack, band
Conformity RoHS, REACH RoHS, REACH RoHS, REACH RoHS, REACH RoHS, REACH
Execution Gold-copper-cadmium, gold-cobalt, gold-silver, pure gold Palladium, palladium-nickel, palladium-nickel with gold coating, pure palladium Silver inorganically or organically passivated, silver with galvanic coating Natural or black ruthenium, over a very corrosion-resistant Ni base layer with a thin gold intermediate layer Application-specific over a corrosion-resistant Ni base layer
From our R&D Galvatronic®, Duor®, Tribor®, Tribor 99® Optargen®
Protective properties Protection against tarnishing or corrosion due to thermal or chemical stress, wear protection Protection against tarnishing or corrosion due to thermal or chemical stress, wear protection Protection against tarnishing or corrosion due to thermal or chemical stress, wear protection Protection against tarnishing or corrosion due to thermal or chemical stress, wear protection Protection against tarnishing or corrosion due to thermal or chemical stress, wear protection
Functional properties Conductive, solderable, bondable, contact surface for contact resistance, good conductivity, solderability, good bondability Conductive, solderable, bondable, contact surface for contact resistance, good conductivity, solderability, good bondability Conductive, solderable, bondable, contact surface for contact resistance, good conductivity, solderability, good bondability Conductive, solderable, bondable, contact surface for contact resistance, good conductivity, solderability, good bondability Conductive, solderable, bondable, contact surface for contact resistance, good conductivity, solderability, good bondability
Decorative properties Depending on the coating system, homogeneous technical or decorative surface, matt to glossy Depending on the coating system, homogeneous technical or decorative surface, matt to glossy Depending on the coating system, homogeneous technical or decorative surface, matt to glossy Depending on the coating system, homogeneous technical or decorative surface, matt to glossy Depending on the coating system, homogeneous technical or decorative surface, matt to glossy
Special properties Bright gold: high optical reflectance Partially non-magnetic Magnetic 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