A field life prediction model based on the results of an Ss gas accelerated test for electronic modules that considers environment factors in engine room as well as driving conditions is investigated. Electronic modules structure mounted in vehicle engine room which a circuit board is placed on a base within a housing and sealed with silicone. We assumed that the S_8 gas released by the rubber ducts in the highest temperature period after the engine is stopped, permeates the silicone and corrodes the Ag wiring in the electronic modules. The corrosion rate is determined by the sum of the number of engine start/stop cycles. The attenuation state of Ss gas in the field is expressed by exponential function. By comparing the calculated results and measured results of a vehicle driving test, it was confirmed that the results of the model produced is closely correlated with real-life.
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