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Letter 10783
Black Oxide Hi-Temp
Application
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We are working with an OEM metal fabricator looking to perform
Black Oxide coating of 16 ga sheet metal in house. We have tried hi
temp paints on a burner application and failed. The temperatures in
service exceed 600 F. Is Black Oxide an alternative, will it provide
corrosion inhibition by itself, and what equipment is required?
Rob R

- Overland Park, Kansas
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Black oxide is a great choice for the application. Black oxide
will stay color stable to about 1000 deg F. Many assemblies for
exhaust applications are finished with hot black oxide (don't use
cold black oxide - it will melt off quickly). As far as corrosion
resistance, you will want to put a rust prevent on for shipping,
storage, etc until the unit goes into service. At that point, with
the high temp operating conditions, I don't think corrosion will be
too much of an issue - you'll be evaporating any corrosion-causing
moisture before it can do much harm.
Dan Brewer
chemical process supplier - Gurnee, Illinois
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The equipment required for a black oxide coating can generally be
recommended by the manufacturer of the chemistry. Such
recommendations include proper tank and heater materials, agitation
type, and operating parameters. It is also important to note that you
will need to investigate your local air and water quality
requirements to make sure ventilation and industrial water treatment
are in place if necessary.
Best of Luck,
- Ira Donovan,
M.S.F.
- Ed. note: Master
Surface Finisher
is NASF's highest certification level.
- Burns
& McDonnell
- Kansas City, Missouri
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September 13, 2009
I am study about metal reaction
but I cant find how I can make steel black
I cant find how I can do it correctly.
Gammer Keshishian
student - Armenia , Yerevan
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