How long Gold Plating over brass will last? Will the zinc discolor plating?
October 21, 2009
I am trying to do .5 micron gold plating over brass jewelry. but my manufacturer said that it will get discoloration very quickly because of zinc in brass. he said Zinc will migrate with the gold and will discoloration.
he suggested me to do first Nickel or palladium plating then Gold plating, which will last my gold plating for more longer period.
I need expert advise.
jewelry - DALLAS, Texas, USA
October 22, 2009
Hi, Sunny. You have been advised correctly. The gold and brass will diffuse together if there is not a barrier layer of nickel between them.
Regards,
|
 Ted Mooney, P.E. RET finishing.com Brick, New Jersey |
December 8, 2009
Hello,
In fact, a barrier layer shall be added between brass and gold.
Onto house-goods, we put a 5 microns bright nickel layer to avoid the problem of Copper diffusion into gold layer.
But, considering the new politics concerning "nickel-free processes" for jewelry, we have replaced the nickel barrier by a white bronze layer (5 microns) for the parts in permanent contact with skin.
Hope it can help you.
- Bordeaux, France
September 17, 2010
I am doing high end 3 micron gold plated brass jewellery. My process is : copper plating on polished item, buffing, flash cyanide copper, palladium plating, micron gold and flash gold.
My question:
1) Can I use white bronze in between copper and palladium which my customer wants? I tried but could not plate anything over white bronze. It seems white bronze cannot be plated.
2) Can palladium be plated directly on brass. After buffing, at some places the plating wears off specially at the edges of the articles and hence the base brass gets exposed. Can I plate PD directly on it? I tried rhodium but it attacks there.
Please help.
Regards
DB
- KOLKATA INDIA
November 4, 2010
Hi,
You can always plate on top of Bronze, I think you have some problem with the chemistry of White bronze.
|
Praveen Kumar plating process supplier Mumbai, India |
May 14, 2012
Q. I have a ring that says it is double layer of genuine 18k white gold and rhodium platinum over brass. Will that turn my finger green?
katie donalds- duluth Minnesota
May , 2012
A. Hi Katie.
Neither white gold nor rhodium will turn your finger green, but brass will. So if the plating is good and heavy and free of porosity you will be okay until it wears thin.
Regards,
|
Ted Mooney, P.E. RET finishing.com Brick, New Jersey |
