Elgin Fastener Group
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Zinc Applications and Parts.  Click on product shot to see a larger image. Zinc Coatings From Best Metal Finishing.

Best Metal Finishing has the experience and equipment to handle smaller, delicate parts as well as long, bulkier rack zinc applications.

Zinc plating is a self sacrificing finish, applied to steel to give corrosive resistance and a decorative finish. Sacrificial finishes allow the zinc coating to be attacked by a corrosive element such as moisture, thus protecting the base steel. Chromate conversion coatings can be completed over the zinc in various decorative colors that not only look good but also enhance its protective abilities. The protective nature of zinc plating can be further increased through the application of seals, waxes or lacquers. Zinc can also serve as an excellent primer base for painting by adding corrosive protection without interfering with decorative coloring.

Best Metal applies zinc plating via two different methods:

Barrel Zinc — Barrel zinc plating is used to plate small diverse parts. The parts are placed inside a perforated, rotating barrel for an even finish. Coating thickness is controlled by load size, current density applied and duration in the bath. Conversion coatings are applied after the plating process. Many commercial platers process large loads in massive machines that roll the parts over and over on a horizontal axis, leading to potential part damage and bending problems. But not Best Metal Finishing. Our process is designed to handle lighter, more delicate parts in smaller barrels that slowly rotate on a 45° axis. This gives an even finish while minimizing the damage potential from rotation of the parts.

Rack Zinc — Rack zinc plating is used for two very different types of parts. The first are parts that are too delicate for even our small barrels. The second are parts that are too large or heavy to barrel plate. With rack zinc plating, these parts remain stationary on the rack and don't rotate. All conversion coatings and post coatings are also available on our rack line. Our rack process can accommodate parts up to 16" W x 48" L x 12" D.

Click on product shot to see a larger image.
Chromate Conversion Coatings
and Salt Spray Life
COLOR
HOURS TO RED RUST
Clear (blue)
24+
Yellow (gold)
96+
Black
100+
Olive Drab (green)
200+
+ Salt Spray life depends upon zinc thickness specified, and can be increased by the post application of seals, wax or lacquer.

Trivalent Chromate

Some automotive standards call for the use of hexavalent free chromates. Trivalent chromates are available in clear, yellow and black.

Baking

Industry standards recommend that heat treated or hardened steel parts be baked for a minimum of four hours at 375° after zinc plating to ensure relief of captured hydrogen to prevent embrittlement. Best Metal Finishing offers baking for six hours at 400° to ensure the minimums are exceeded.

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Best Metal Finishing, Inc.
P.O. Box 156, 1050 Railroad Ave.
Osgood, Indiana 47037
Tel. 812-689-9950 Fax 812-689-3401
E-mail: sales@bestmetalfinishing.com


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