The Test Plan Design of Corrosion Fault Repeat and Material Selection for a Type of PCB

摘要

The failure analysis (FA) of the PCB indicates that the connecting line of relay pin and inner structure is broken for Cl corrosion. To verify the above conclusion and find the introducing path of Cl, the accelerated corrosion test profile is designed in this paper. The failure mode is repeated successfully after six cycles and Cl is found on the connecting line of relay obviously. Besides, the different design versions of PCBs with different placed orientations are compared in this test. And the better version of PCB and better placed orientation are confirmed consequently. The following works like material replacement and PCB design refinement can benefit from the results of this paper.