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topic 18961

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


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


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 probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
Editor's note: Mr. Probert is the author of Aluminum How-To / Aluminio El Como
and co-author of The Sulfamate Nickel How-To Guide

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