70/30 Copper Tin Anodes

Lead-free1-1/4" x 3" x 27" Cast Oval Bronze and White Bronze Plating Copper-Tin Alloy Anode Nickel-Free Finish Applications

70% copper, 30% tin cast oval anodes (1-1/4" x 3" x 27") for copper-tin (bronze) electroplating, including nickel-free white bronze finishes.

Solidus

1,090°F (588°C)

Liquidus

1,400°F (760°C)

Density

0.311 lbs/in³ (8.6 g/cm³)

Primary Elements

Cu, Sn

Nominal Composition

30% Sn, 70% Cu

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Product Overview

70/30 Copper Tin Anodes are cast copper-tin alloy anodes with a nominal composition of 70% Cu and 30% Sn. They are used in copper-tin alloy electroplating baths, where the anode replaces copper and tin in the solution as metal is deposited on the work.

Copper-tin (bronze) electroplating produces deposits ranging from yellow bronze to the silvery “white bronze” finish used as a nickel-free alternative for jewelry, fashion accessories, eyewear, and decorative hardware. Using an alloy anode helps keep the copper and tin content of the bath in balance and reduces the need for separate metal additions.

Supplied as 1-1/4″ x 3″ x 27″ cast oval anodes.

Available Forms

1-1/4" x 3" x 27" Cast Oval Anodes

Product Code

4704

Technical Info

Thermal Properties

Melting Point (Solidus)1,090°F (588°C)

Melting Point (Liquidus)1,400°F (760°C)

Physical Properties

Density (imperial)0.311 lbs/in³

Density (metric)8.6 g/cm³

Primary ElementsCu, Sn

Lead FreeYes

Key Features

1-1/4" x 3" x 27" Cast OvalBronze and White Bronze PlatingCopper-Tin Alloy AnodeNickel-Free Finish Applications

Nominal Composition

70% Cu
30% Sn

Copper-tin electroplating produces bronze deposits that resist tarnish and corrosion. High-tin "white bronze" deposits have a bright, silvery appearance and are widely used as a nickel-free alternative to nickel plating on jewelry, eyewear, and fashion accessories, avoiding nickel allergy concerns. Lower-tin deposits give a yellow bronze finish for decorative hardware.

An alloy anode dissolves both metals together, helping keep the copper-to-tin ratio of the bath steady during production. This simplifies bath maintenance compared with balancing separate copper and tin anodes or adding metal salts.

Copper-tin plating chemistries vary, and some proprietary processes specify insoluble anodes or a particular anode composition. Check with your plating chemistry supplier to confirm that a 70/30 copper-tin anode is appropriate for your bath before use.