Birchwood Technologies offers the BC40 and BC100 Tru Temp black oxide processing lines, designed to reduce costs for metal finishing through lean manufacturing. The tank lines, equipped with either 40- or 100-gallon capacities, are pre-engineered for fast setup and use. Featuring seven individualized tanks, the systems are constructed of either 10-gauge welded, epoxy-painted steel or welded polypropylene, and are equipped with heaters and plumbing connections. The process is intended to be an in-house substitute for more-dangerous 290°F hot oxide processes. With an operating temperature nearly 100°F cooler, the black oxide process is safer and avoids the hazards of a boiling tank, the company says.
The Tru Temp process is designed to streamline workpiece movement and eliminate unnecessary operations. With a 10- to 12-minute blackening time, the process forms a durable black magnetite finish of 0.000020" thickness. According to the company, the process satisfies Mil Spec DTL 13924D and AMS 2485 and contains no EPA-regulated metals so that rinse waters are generally sewerable without waste treatment. The system is also said to require less energy than conventional oxide finishing systems.