Process for continuous titanium sheet pickling and passivation w

Details Process for continuous titanium sheet pickling and passivation w Process for continuous titanium sheet pickling and passivation w

1993-09-24

1995-05-23

Kastler, Scott

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148270, 148273, 148274, 148281, C23C 2234

Patent

active

054177758

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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