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Quality problems in Rhodium plating

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We are currently using Rhodium J1 Solution for electro plating. We have a problem in, after plating there are Black spot and yellowish marks are there.

Plating conditions are,
Anodes: Platinised Titanium
Bath Tank : Plastic
Voltage : 3 - 4 Volts
Current density : 0. 5 - 1 A/ dm2
Time of exposure : 1 min - 2 min for rings.
Bath agitation : 5- 10 cm/s

Bath preparation and other conditions are according to conditions specified by the plating solution manufacture.

Kaushal Pathirana
Plating Shop - Galle., Southern, Sri Lanka

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Black spots in plating are usually caused by contaminants in the plating solution, often tramp metals. The supplier of the rhodium plating solution should be able to provide guidance though.

Ted Mooney, P.E.
finishing.com
Brick, New Jersey

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Dear Kaushal

Improve your pretreatment and switch on j-2 in place of j-1 bcoz in j1 there is no wetting agent it is for barrel plating and in vat due to lack of proper agitation it gives black spot.

Thanks,

Qutub Saify
- Ajman, UAE

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