Ebonol®
'C' which is a black oxide treatment that can be applied for
blackening and colouring brass, copper and copper alloys. Ebonol® 'C'
produces a
cupric oxide coating on copper and copper alloys containing
65% or more of copper.
The coating
produced by the Ebonol® 'C' process is
jet black, chemically stable, heat stable and very adherent.
The finish itself will withstand temperatures up to about 400 °F
(187 °C). At higher temperatures, the coating will slowly
degrade due to oxidation of the base copper. Oiling, lacquering
or waxing will serve to enhance corrosion protection. The process
provides a superior base for painting, lacquering or enamelling.
Tanks: We
offer tank sizes up to 2' x 2' x 2'.
Overview: Ebonol® 'C'
is typically used to treat copper surfaces after copper plating
in order to achieve a highly absorptive black
surface.
This
Ebonol
generally gives the treated piece a velvet appearance, and
on a microscopic scale, dendrites appear on the surface of
the finish. These dendrites tend to trap light for a higher
absorptivity. This type of treatment is used in optical and
aerospace applications for light rejection and other
optical
properties.
Ebonol-C
is also used to treat bronze in jewellery to give it a black
appearance.
Blacking: Almost
all alloys containing from 65 to 100% copper can be blackened
with the Ebonol® 'C'. Certain elements such
as tin, beryllium, and silicon may interfere with good blackening.
When the copper concentration in the alloy is 90% or greater,
direct
blackening can be accomplished after cleaning and acid dipping.
With lower copper contents in the alloy, an activating treatment
must be given prior to blackening.
Bright
Finishes: Both bright and satin finishes can be
obtained with Ebonol® 'C'. For bright finishes,
the work is first buffed to a good luster. It is then cleaned,
blackened, rinsed and dried. The highest luster and the deepest
black is obtained by coating the untouched Ebonol® 'C'
surface with a high-bodied clear baking enamel. Beautiful
glossy,
jet black surfaces are produced in this manner. Less glossy
but attractive surfaces can be produced by wiping the Ebonol® 'C'
with an oiled cloth or tumbling in an oiled material, such
as sawdust,
leather meal, cork or
wooden pegs.
Paint
Bases: Ebonol® 'C' offers an excellent
bases for organic finishing, such a painting, lacquering
or enamelling. The process produces thousands of jet black
cupric oxide needles per square inch. Once these needles
become imbedded in the organic coating and the coating sets,
adhesion
is tight and long-lasting. Also, the cupric oxide inhibits
reaction between the base metal and the organic coating.
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