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Solderability problem

What can be the cause for the poor solderability for a bright tin plated pin, brass pin with copper underlayer.

Ken Soh
- Singapore
2003

The brighteners use in bright tin baths are organic, as such they co-deposit with the tin and can interfere with solderability. This is usually the case. However also over time intermetallics will form between the tin and the copper, rendering the part less solderable.

Jon Quirt
- Fridley, Minnesota
2003

Apparently the copper and/or zinc are migrating up thru the tin when heat is applied. Try increasing the thickness of the tin plate or use a nickel diffusion barrier between the brass and tin.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

2003

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