Mini metal finishing systems perform small-batch blackening

Birchwood Technologies offers three mini systems for use in small-batch metal finishing at low temperatures. The company offers these blackening systems for the Presto Black® and TruTemp® processes for iron and steel parts, and the Lumiclad® process for aluminum parts. All three processes use a conventional seven-tank immersion process line.

The cold Presto Black process forms a nondimensional coating thickness of less than 0.5 micron, suitable for components that require a black finish for visual appeal. The low-temperature TruTemp process forms a durable satin black magnetite coating, 0.5 micron thick, with no effect on material hardness or tensile strength. The Lumiclad process forms a nondimensional black oxide finish on all aluminum surfaces. The process develops a uniform coating thickness of 1.5 microns that will not close down hole diameters or change critical part dimensions.