Corrosive Effects of Solder Flux on Printed Circuit Boards.
ARMY ELECTRONICS COMMAND FORT MONMOUTH NJ
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Some ANPRC-25 radio sets have been reported inoperable by breakage of transistor and quartz crystal Kovar leads. It was demonstrated that these leads failed by stress-corrosion cracking. The only source of specific corrodent for this type of failure was chloride ions found in residual flux on printed circuitry. The clue to the corrosive effects of the flux was the identification of corrosion products found on the printed wiring. Recommended is scrupulous cleaning of the printed circuit boards followed by conformal coating. Author
- Electrical and Electronic Equipment