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topic 631

Seeking a Black Finish that will not fluoresce


(1996)

For our research, we need a black finish on metal that when illuminated by light at 585 nm will produce no fluoresce (that is absorb this light and re-emit light of a different wavelength). Thus, we would like to try out different finishes to see which works best. We believe that treatments involving organic dyes or oils will not work for our application. So, we would like suggestions for black finishes on any metal surface that don't contain organic compounds. We would also be interested in any suitable paints you know of.

Kathy Perkins
Harvard Univ. - Cambridge, Massachusetts


(1996)

Christian Johnson of N.I.S.T. wrote a paper called "Unique Surface Morphology with Extremely High Light Absorption Capacity" for "Electroless Nickel Conference" (1979, I believe) sponsored by "Products Finishing" magazine, Cincinnati, Ohio. This sounds like it might work.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


(1996)

Kathy,

Just an unqualified suggestion, how about compound with dichromide composition?

regards

Leonard Yeung
(1996)

Black chrome and black nickel appear to comply or come close to fitting this requirement. Source: Safranek's book The Properties of Electrodeposited Metals and Alloys. Not much difference in absorbance and emission numbers between the two. Instrumentation and cosmetics are their most common uses. Not a lot of companies do this type of plating because it can be a pain. You may find a plater in this site or try AESF' listing.

James Watts
- Navarre, Florida


(1996)

Kathy, Highland Plating processes both Black Nickel and Black Chrome! We also have equipment for measuring emittance and absorbtivity. Please contact us if you have any questions.

Max T. Faeth
- Los Angeles, California, USA


(1998)

Why not try using "black oxide" an oxide-layer on copper. A lot of companies (like e.g. Lea-ronal or ENTHONE-OMI are offering processes for this. Try to contact them also and let us know (me and my peers) if you solved you're problem. Good luck.

Harry van der Zanden
Harry van der Zanden
- Budapest, Hungary


(1997)

Harry is right, black oxide could be a good solution. In case your substrate is not copper, you can find black oxide for steel and stainless steel as well. The point is that black oxide gives no protection to parts. Black chrome (it is a coating I especially like) or black nickel are usually plated on nickel so it will give a protection effect as well. Black nickel is much easier to maintain then black chrome.By the way, there are also coatings of black Ruthenium, black nickel-tin etc.

sara michaeli
sara michaeli signature 
Sara Michaeli
chemical process supplier
Tel-Aviv, Israel




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