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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
Falls Township, Pennsylvania

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