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Removing smut from copper surface

I am searching for advice to remove smut that deposited on the copper surface,the smut that I mention is a thin black layer of deposit normally formed after acid pretreatment. Thanks

Benny Lim
- Kuala Lumpur, Malaysia
2000

2000

Tell us:

the composition of the acid, temperature, agitation, analysis of impurities, or if the acid works fine for a while, then starts forming smut, dump the acid more frequently or treat the acid to remove impurities.

Tom Pullizzi
Falls Township, Pennsylvania

Depends on the size of your parts and what treatment they will get in later stages. We mildly etch the top surface off and then barrel the parts to get a clean shiny surface

Mark Camilleri
- Malta
2001

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