Marking
Aluminum For Anodizing
Aluminum which is properly anodized cannot be marked. It
requires many thousands of volts to break through a good
anodized surface. The only alternative is to etch the aluminum
before anodizing. If the etch is deep enough it will show
through after anodizing. Since aluminum is a good conductor
of electricity, it etches deeply very quickly and easily.
There is a simple way to determine the depth of etch necessary
to show up after anodizing. There is no hard and fast rule
to tell the proper depth of etching in aluminum to insure
that the etch will last through anodizing. This is true because
there is more than one method to anodize the many different
aluminum alloys. It is suggested that one start out by etching
a piece of aluminum for two seconds time dwell, and five
seconds time dwell, and ten seconds time dwell.
After processing this piece of aluminum through the anodizing,
one can tell which is the proper etch time.
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