Process for continuous titanium sheet pickling and passivation without using nitric acid
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United States of America Patent
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May 23, 1995
Grant Date -
N/A
app pub date -
Sep 24, 1993
filing date -
Oct 12, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Process for sheet titanium pickling followed by passivation. Pickling is carried out in an aqueous solution containing H.sub.2 SO.sub.4, HF and Fe.sup.3+ at .ltoreq.50.degree. C., continuously fed with an air flow, and with a stabilized H.sub.2 O.sub.2 quantity adjusted to the bath redox potential to be kept at -200 to 0 mV. Passivation is carried out in an aqueous bath containing 4 to 10 g/l HF, .ltoreq.1 g/l Fe.sup.3+, and not containing H.sub.2 SO.sub.4, with a redox potential kept at 500-600 mV by continuous feeding of stabilized H.sub.2 O.sub.2.
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