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Poor throw in trivalent chrome plating bath



 

Having troubles with coverage in trivalent chrome bath from MacDermid (ex. Canning-Gumm). Boric acid is at vendor recommended level. Using specialized vendor-offered anodes. The majority if parts are large faucets or similar. Brass/Copper as substrates. Bright Nickel undercoat. pH 3.5 is found to be working pretty well, but poor coverage on LCD areas is an on-going problem. Any ideas?

Elena Bliemel
- USA



The most likely cause of poor throw in that bath is contamination by metallic impurities, but you will need a full analysis. Also if you are using the membrane anodes, you need to keep them maintained so they do not leak.

tom pullizzi monitor   tom pullizi signature
Tom Pullizzi
Falls Township, Pennsylvania
 




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