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Temperature of Hard Chrome Reverse Etch

May 6, 2010

If you are reverse etching in a separate tank than the plating tank, does the reverse etch solution still have to be heated to 120-140F?
Lower temperatures would be more convenient and produce less emissions, but I have never heard of anyone reverse etching at lower temperatures.

Mark Robison
Plater - Ogden, Utah

May 6, 2010

Hi, Mark. The etch should be straight chromic acid 26-30 oz/gal, no catalyst, 130 deg F, with the part brought up to bath temperature before power is applied, per Guffie
... but, sorry, he doesn't comment on possible variations except to caution against too dilute solutions.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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