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Circuit Board Ionic Cleanliness Measurement: What Does It Tell Us?
Introduction
In the early 1970's the only fluxes permissible for electronics manufacturing for military applications were types R (pure rosin only) and RMA (rosin based, mildly activated). Before any of these fluxes could be approved and established on the military "qualified products list", it was necessary to demonstrate that were non-corrosive and did not contain ionic halides in of established critical levels. All fluxes were required to pass a silver chromate paper test which sensitively indicates presence of halide ions.
Additionally, the flux was subjected a copper mirror corrosion test which is a sensitive indicator any corrosive behavior of the flux toward copper.
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