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Chromic Acid Pickling Alternatives

Dear P2 Colleagues,
I'm working with a company that machines brass rings for compressor fittings.  The final stage in their process involves a chromic acid pickle to remove any layers of oxide.  They are interested in finding an alternative.  I've heard about organic peroxides and possible abrasive cleaning, but does anyone have more specific information on this (case studies, vendor info, etc.) and other alternatives.
Thanks in advance.
David A. Foulkes, Environmental Specialist
State of Ohio EPA
Office of Compliance Assistance and Pollution Prevention
P.O. Box 1049
Columbus, OH  43216-1049
(614) 644-3118
FAX: (614) 644-2807
email:  dave.foulkes@epa.state.oh.us
World Wide Web:  www.epa.state.oh.us/ocapp/