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Detailed rhodium plating process
I have been trying to do rhodium plating with steps suggested by my supplier:
preparation
-grinding
-ultrasonic cleaning
plating
-degreasing at 50° Celsius
-acid wash with H2SO4
-Rinse with Distilled water
-plating with rhodium using 4volt in room temperature
the result has been disappointing, gold I've plated doesn't have the brightness I expected
can anyone share their expertise on this matter?
thank you in advance
Jeweller - Surabaya, Indonesia
++++++
Hi Khong,
Though U did not give much about what u do, I would give u some points u may consider.
1.U may go for Rh plating straight after Sulphuric Acid dip with out water swill(2-5% H2SO4)
2.Though lately room temp.process is available, it is better to warm the bath.
3.No direct heating but use a water bath.
4.Try plating at 5-6 Volt
5. Live load!(Rectifier should be 'ON' before plating
6.Check your anode (if Pt mesh is used)
7.The surface should be bright.
8. Finally if the problem still persists,try to give activated carbon treatment(1 g/l)
regards
|
T.K. Mohan plating process supplier Mumbai, India |
++++++
Hi Khong,
If you are using 1 or 2 liters bath use in glass beaker and warm the solution...carbon filter is done if you have larger bath starting from 10 liters. for 1 or 2 liters you'll need filter paper.
Use Platinum plated anodes. After Sulphuric Acid dip, spray Di water the items, set up voltage 3.5 to 4 if it is ring for 120 second to
200 seconds I'm 100% sure it'll be bright white color.
I do have Rh bath of 5 liters mostly I don't get problem if I get I use in tank filtering that's best for small bath....same as I wrote above I use that way my bath......use gold or nickel plated wires.
good luck
Dipen Pattni
jeweler/goldsmith - Dar-Es-Salaam, Tanzania
May 19, 2011 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread
WHAT TEMPERATURE SHOULD A RHODIUM BATH BE SET AT? ROOM TEMPERATURE OR 110 DEGREES?
BILLY CARTHENFORMER PLATER - OAKLAND, CALIFORNIA
July 22, 2011
Hi guys and t.k.mohan sir
My name is pavan Soni and I'm from Pune Maharashtra .
I have purchased the CCCV rectifier and rhodium pen plating solution as well as ultrasonic cleaner of 1.2 l for rhodium finishing but the results are still not up to the marks. I have read every thread over google as well as on finishing.com to overcome the problem but of no use. The procedure which I'm following is as follows
1. Buffing the 22k gold jewelry to high polish for shine.
2. then ultra sonic cleaning with solution
3. Then wash with the dm water then 5% sulfuric bath then again with dm water
4. Electrocleaning at 4 to 6 v for two minutes
5. Again 3 step.
6. After drying the jewelry with hair dryer
7. Then finally plating without touching my hand over the place where Rh plating is done. With pen plating at 6-8 volts and normal speed.
Could u guys please help me out I have gone behind my budget for this but of no use
It would be pleasure if guys can send me reply please
Student - Pune, Maharashtra, India
^- Privately contact this inquirer -^
July 25, 2011
Pen plating is extremely operator sensitive and jewelry would seem to be extremely difficult.
I would eliminate the drying step.
Finally, no one can really help you until they know what the time, temperature voltage and material/concentration is being used for each step.
Normally the company that you bought the equipment and chemicals from would have a technical services group to help you. If their stuff does not work there is a probability that you will go to another company that will help. Lost customer that will bad mouth their product. Bad business.
- Navarre, Florida
July 28, 2011
hello sir,
I tried eliminating the drying step and detail about temperature voltage and concentration is given below...
I use the pen plating solution @ ROOM temp. and the voltage of the rectifier is 6-8 V for plating and the conc. for H2SO4 is 5% but I don't know the concentration of liquid Rh, but I use the liquid as it is sold to me..
- Shahada, Maharashtra, India
August 2, 2011
hi guys
Do reply my query fast ... I m waiting for ur help...bcoz I know this is the only place whr I can get the desired help...
Hope u guys reply soon..
Regards
Pavan
- shahada,maharashtra india