Hazard-free block oxide finishes with new process
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Birchwood Casey product story
Edited by the Engineeringtalk editorial team
Nov 10, 2004
Metal finishers and manufacturers can now eliminate the hazards of boiling caustic soda tanks and produce high quality black oxide finishes claimed Birchwood Casey.
Metal finishers and manufacturers can now eliminate the hazards of boiling caustic soda tanks and produce high quality black oxide finishes claimed Birchwood Casey.
The company's patented Tru Temp metal finishing process is a low temperature black oxide process that operates at only 200 degrees F and offers safe operation and short process time - without EPA regulated metal content said Birchwood.
It is claimed to blacken all iron and non-stainless steels and even MIM parts without white salt leaching or off-colour finishes.
The black oxide finish, which is said to satisfy Mil Spec DTL 13924D and AMS 2485, is a durable, satin magnetite of.000020 inch (0.5 micron) thickness with excellent corrosion resistance.
Overall process time is only about 20 minutes, which is about half the time required for conventional black oxide.
Consequently, blackening line throughput is high and part movement can be streamlined to enhance Lean Manufacturing programs.
An in-house Tru Temp line is a safe and easy way to achieve same-day turnaround to fill key customer orders without raising inventory levels.
Because there is no EPA regulated metal content, the process rinse waters can be rinsed via the sewer without waste treatment (large process lines may require pH adjustment) claimed Birchwood Casey.
Birchwood Casey said that initial capital investment for the process is low and chemical operating cost is only about 1-3 cents per pound of finished parts.
Existing black oxide lines can often be retrofitted at low cost to convert to the Tru Temp process.
Pre-engineered turnkey process lines are available from Birchwood Casey in various configurations that install in a day's time said the company.
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