Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Iron Build-up in Acid Copper Bath
I have a 600 gal. acid copper tank, for decorative work before nickel/chrome. Copper sulphate-28.7 oz/gal., Sulfuric Acid 10.7 oz/gal. Chloride 108.6 ppm (high). Due to water conservation it finally caught up with us. Problem is the iron has built up to 7,250 ppm (should be no more than 1,000 ppm I think). Proprietary brightener system, air agitation, phos copper nuggets, etc. Our vendor has recommended dumping. It will not hold voltage or amperage and is skip plating in the low CD. Peroxide and permanganate does not work. Does anyone know of an iron complexor at a pH of <1? I was told there is a complexor for pH >12. Help!
Bill Hemptech svc. w/ chemical supplier - Grand Rapids, Michigan
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