Accession Number : AD0871671

Title :   Corrosive Effects of Solder Flux on Printed Circuit Boards.

Descriptive Note : Technical rept.,

Corporate Author : ARMY ELECTRONICS COMMAND FORT MONMOUTH NJ

Personal Author(s) : Raffalovich, Aubrey J.

Report Date : APR 1970

Pagination or Media Count : 29

Abstract : Some AN/PRC-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)

Descriptors :   *CORROSION), (*PRINTED CIRCUITS, (*SOLDERING FLUXES, CORROSION), STRESS CORROSION, COBALT ALLOYS, ELECTRIC CONNECTORS, CORROSION INHIBITION.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE