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topic 29400

Organic removal from gold



2004

I am wanting to clean any organics inside of a gold metal package. I was curious if H2SO4:H2O2 will react to the gold along with a step2 clean NH4OH:H2O2.

John Atwood
electronics mfgr. - New York, New York, USA


2004

Cyanides and aqua regia (a mixture of hydrochloric and nitric acid) are about the only chemicals that attack gold. Not so if the gold is thin and porous. Then, any chemical that attacks the substrate will pass through the pores and lift the gold layer.

Guillermo Marrufo
Monterrey, NL, Mexico

none
adv.
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