Tri-Metal

Barrel and Rack Plating Electrolyte for Functional Applications

More than 30 years of MIRALLOY^©, the nickel-free alternative for coating in the connector, clothing and costume jewelry industries. You can take advantage of our experience as well as continuous improvements to our product line. The trademark MIRALLOY^© comes from the English words “mirror” and “alloy”. It refers to the Bronze Age when mirror-like coatings were produced from copper and tin.

MIRALLOY^© denotes electroplating processes for the deposition of alloy coating of copper and tin or of copper, tin and zinc. The basic composition of the electrolyte, either white or yellow layers can be deposited. White coatings contain about 55% of copper and 45% of tin, or 55% of copper, 30% of tin and 15% of zinc. Yellow coatings as alloy components on an average contain 80% of copper, 17.5% of tin and 2.5% of zinc, or 85% of copper, 10% of tin and 5% of zinc, or 85% of copper and 15% of tin. From the wide range of MIRALLOY^© processes, electrolytes for rack or for barrel operation can be selected.

MIRALLOY^© coatings are characterized by an excellent thickness distribution even in the case of parts with complex shapes. The coating hardnesses of MIRALLOY^© layers are 400 HV 0.1 (MIRALLOY^© yellow) and 550 HV 0.05 (MIRALLOY^© white). The layers are abrasion-resistant. For this reason yellow MIRALLOY^© layers are particularly suitable for coating bearing shells or pistons. Furthermore, the layers are diamagnetic. Therefore connectors for high-frequency technology provided with MIRALLOY^© coatings reach very low intermodulation values in the mobile radio frequency range.

Your Advantages:

• Coating color: white, similar to silver
• Diamagnetic
• Good covering power
• High reflectivity
• Good wear and corrosion protection
• Abrasion – and tarnish – resistant
• Can be combined with precious metals
• Good sliding properties
• High hardness
• Solderable and weldable
• Very good metal distribution
• Low porosity