EVALUATION OF THE SO2 AND NO2 MIXED-GAS TESTS FOR ELECTRONIC PARTS

This paper describes mixed gas systems of SO2 and NO2 which are the es sential corrosive gases in an ordinary atmospheric environment of elec tronic parts. It describes the corrosion product compositions and the behavior of copper in mixed and separate gases. Results of our tests s how the following: (1) The weight of corrosion products with the SO2-N O2 mixed gas approximate the sum of those with the individual gases, h owever, the corrosion products of SO2 are affected by NO2. (2) Tests o f the SO2-NO2 mixed gas closely simulates tests of electronic parts in the ordinary atmospheric environment.