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Trouble in Chrome bath

Q. The trivalent chromium is going down no matter, even if I plate small part in chromium bath having platinized titanium anode. Cause and remedy?

Payal Mag
- Charlotte, North Carolina
2001

A. Payal,

Trivalent and hexavalent Chrome are found in varying concentrations in a chrome bath . A regular decorative bath runs well with 250 Hexa and 3 to 4 Gms/lit Tri, and so would a hard chrome bath.

The Nascent oxygen generated at the anode converts Trivalent back to hexa, so the relative anode area needs a look. If lack of trivalent is affecting your results , add 0.25 gram per liter Sugar to the bath. that will push up the trivalent Chrome.

Asif Nurie [deceased]
- New Delhi, India
With deep regret we sadly advise that Asif passed away on Jan 24, 2016
2001

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