Hi Wayne,
The kicker is the alkaline etch.  If you were using acid etch, usually, the
chromates don't bother you much.  I don't feel that just a sulfuric acid will
get the job done 100% of the time.  Some companies are using a acid cleaner
with a slight microetch in it to remove the chromates.   My preference is to
use a alkaline cleaner with a chromate removal chemistry in it, followed by a
good water rinse and dry.  There are some alkaline etch dry films on the
market that are compatible with this type of preclean.
Ken Bridges - Morton

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