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Letter 26001
Procedure for mirror finishing naval
brass for 99.9% reflection [India]
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DEAR SIR,
I AM MANUFACTURING AN ELLIPSE SHAPED REFLECTOR. IT IS DIVIDED INTO
TWO PARTS, UPPER HALF ELLIPSE AND LOWER HALF ELLIPSE. THE BASE
MATERIAL IS NAVAL BRASS. I AM TELLING YOU MY REGULAR PROCEDURE OF
MANUFACTURING ELLIPSE: ELLIPSE IS MADE USING WIRECUT MACHINE.THEN I
USE BUFFING PROCESS FOR GETTING MIRROR FINISH AND THEN I COAT IT WITH
THREE DIFFERENT MATERIALS-- NICKEL , PALLADIUM AND FINAL GOLD COATING
TO ACHIEVE 99.9% REFLECTION. AS PER MY KNOWLEDGE, FINAL REFLECTION
DEPENDS ON THE FINISHING BEFORE COATING. I AM NOT ACHIEVING 99.9%
REFLECTION . I WANT TO KNOW THE EXACT PROCEDURE FOR MAKING THE NAVAL
BRASS MATERIAL TO A MIRROR FINISH BEFORE COATING.
PLEASE HELP ME AS SOON AS POSSIBLE .
THANKING YOU,
BHADRESH V PATEL
- SURAT, GUJARAT, INDIA
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I can not answer your question with the information given;
however, I have a question for you. Do you have any idea of the
surface profile of the metal you are using? The finer the RMS of the
metal the better the plating RMS.
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I do not know how you measure reflectivity, but I will be
surprised if you can get "true" reflectivity above 80 or 90% on gold
no matter how much you polish. Gold absorbs light significantly more
than, e.g., aluminum or silver. Aluminum will give you about 97%
reflectivity at the best.
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I'm not talking about reflectivity. I am just trying to get him to
look at the surface finish of the metal. Basically, the smoother the
profile of the metal under any plating determines the smoothness of
the top surface as well, which should translate into reflectivity.
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