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Copper parts go black in 10-12 days after vibrofinishing

We get copper tubes or parts vibro finished and get shining finish.But after 10-12 days finish goes away leaving parts dull.How can we avoid it from happening.

RAVINDRANATHA MAROLI
Vibro finishing engineer - India
September 1, 2010

If you would like to avoid tarnishing of copper parts during storage, then you can use VPI coated papers/packs.

Formation of self-assembled monolayers of thiols is one way of preventing tarnishing of copper.

T.S.N. Sankara Narayanan
- Chennai, Tamilnadu, India
(ed.note Nov. 2017: The good doctor has a fascinating blog at https://advancementinscience.wordpress.com)
October 11, 2010

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