I would appreciate suggestions for removing oxide/hydroxide passivation from
a plated tin surface (high purity matte tin and/or low organic immersion
tin) that has been exposed to an alkaline solution for Cu etching (ammonium
hydroxide/ammonium chloride).  I know hydrochloric acid and sulfuric acid
removes the oxidized surface, but may also remove the tin, and I want
preserve the tin and create a clean tin surface.  Any advice?


Best regards,
Leo

Director of Applications Engineering
ASAT, Inc.
3755 Capital of Texas Highway, Suite 100
Austin, Texas     78704

ph     512-383-4593
fx      512-383-1590
[log in to unmask]
www.asat.com


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