Corrosion criteria for electronic packaging. II. Calculated corrosion currents and acceleration factors

摘要

For pt.I see ibid., p.1090-7, Dec. 1990. Numerical values for corrosion currents are calculated for the parameters cited in Part I. A comparison of relative corrosion currents flowing under test and operating conditions is presented. Ratios of these currents are calculated to identify acceleration factors for several ambients. Data reveal that under certain conditions, net deacceleration can result for devices having junction temperatures that are above test condition temperatures. Net accelerations from test to test are shown to be constant as long as the activation energy for the process remains unchanged.