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topic 3945

HELP ME IN "PLATING PROCESS FOR ALUMINIUM REFLECTORS"


(1999)

I have a factory of luminaires in SANTIAGO, CHILE.

I need to know how to plate the aluminium down light reflectors that I make in my factory.

The reflectancy required is 95%

I DON'T KNOW ANYTHING ABOUT THIS PROCESS BECAUSE WE BUY THIS PRODUCT FINISHED FROM ITALY AND CHINA.

WE WANT TO BUILD A "PROCESS PLANT " FOR PLATING OUR ALUMINIUM REFLECTORS HERE.

ENZO CRIADO HEMRIQUEZ
- CHILE


(1999)

I am not sure offhand of the achievable reflectance, but ASM Metals Handbook Vol. 5 suggests the values obtainable from bright dipping and electropolishing.

The overwhelming majority of reflectors are not electroplated, they are bright dipped and anodized. You may want to study those topics. However, it is probably a risky idea to proceed on a project of this scope, about which you "don't know anything", without retaining a metal finishing consultant / consulting engineer. The earliest decisions are the most important ones. Good luck!

Regards,

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


(1999)

Most bright dip processes and electropolishing processes are dependent upon the alloy, I'd hope that for the best coverage you would be working with pure aluminum and not an alloy, because with the alloys your reflectivity degrades as the amount of aluminum in the part is decreased. 99.9% aluminum can easily reach 95% from what I have seen. Other alloys typically range from 85-90% at the most, some even less than this, and in most cases a clear anodize overtop the bright dip finish will dull the surface a few % points, but it can be lessened by using different concentrations of sulfuric in the anodize. The only way to truly guarantee that you could get 95% would be to use pure aluminum, or consider some sort of silver plating over aluminum.

Matthew Stiltner
plating company - Toledo, Ohio


(2000)

estoy interesado en ayudarlos..

es necesario tener mas informacion de lo que quieren hacer. o sea con detalles. considero que la explicacion que les dio el senor anterior, es correcta. pero como ven no pueden hacer mucho con eso. es necesario entrar en detalles.

hector lopez
- berlin Germany


(2002)

We have to silver plate an aluminum tube, alloy 6063T6. Diameter of the tube is from 4" to 10" . Thickness should be 7 microns ( micro-meters) and the surface should be as smooth as possible. There will be high frequency currents and we have to improve the conductivity. I would like to know how the process is and where we have to buy the chemical components to make the plating in Cordoba.

Thank you,

Ricardo de Goycoechea
- Cordoba, Argentina


(2003)

The first thing I would do is to vacuum deposit a few microns of pure aluminium over the formed material. This can be done with a simple vacuum deposition device. You can make your own for under $1000 and the rate of the device is near 1/minute. This is very common in the lighting industry.

John Powell
- Largo, Florida



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