Black Oxide Line Uses Low-Temperature Process

The BK-TT Tru Temp black oxide line from Birchwood Technologies features seven 5-gallon immersion tanks, covers, headers and chemicals to operate the process for 4 to 6 months, the company says.

New Product Announcements From: 4/30/2014 Modern Machine Shop

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The BK-TT Tru Temp black oxide line from Birchwood Technologies features seven 5-gallon immersion tanks, covers, headers and chemicals to operate the process for 4 to 6 months, the company says. The finishing line occupies about 20 ft.2 and can be placed in toolrooms, manufacturing cells or other locations within a plant.

According to the company, the Tru Temp process uses a two-stage oxidation process with milder chemicals and lower temperatures than other black oxide processes. It operates with mild alkaline chemistry that does not embrittle metal or create salt bloom in and around recessed areas.

The finish, which protects the metal surface during shipment, storage or service, is a durable, satin black magnetite coating measuring 20 millionths of an inch thick (0.5 micron). It is said to have no effect on material hardness or tensile strength, but can withstand as much as 100 hrs. of neutral salt spray or several hundred hours of humidity.

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