
plating, anodizing, & finishing Q&As since 1989
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Chrome plating problems, analysis of bath
October 20, 2010
what are the method of analysis of chrome plating bath?
I am doing decorative chrome plating and my rejection of chrome plating bath is high, how can I control it?
electro plater - Lahore, Pakistan
October 20, 2010
Hi, Khan. I hate to say "read a book", but if you give us no starting point, I almost don't know what else to say. What is the target composition of your plating bath, what current and temperature are you using, what kind of defects are you getting? Are the defects at the top of the rack, the bottom, the HCD areas, the LCD areas or where? If you strip the chrome, is the underlying nickel plated part perfect in all respects? Thanks!
Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
October 20, 2010
Hi,
If your bath is hexavalent chromium, you need to control the concentration of hexavalent chromium and sulfuric acid, and also the current density and racks project. Some contaminants like chloride compounds are very harmful. You have to rinse and activate the parts very well before the chrome bath to have good results.
Regards.
- Joinville, SC, Brazil
December 9, 2010
Sir,
Current density we are using is 25-30 A/dm2,Concentration is 200 g/liter,temperature is 45-50 C, time is 30 second and problem is on LOC area. there is yellowish shade appear in LOC area. some time it increases too much.
- Lahore, Pakistan
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December 10, 2010 You fail to mention the sulphate concentration--That is critical to keep the ratio in a correct range. - Navarre, Florida December 11, 2010 Dear Khan, - Malaysia |
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