针对某型PCB现场失效问题开展了失效分析,发现继电器引脚与内部结构引线处遭CL元素腐蚀而断裂。为了验证失效分析的结论,确定CL元素引入路径,并进行物料择优替代,设计了CL元素腐蚀加速试验剖面,经过6个循环周期,成功复现了现场PCB失效问题,为后续产品物料替代、设计改进等提供理论依据。 Failure analysis of a type of PCB on-site failure carried out failure and found that the pin and the internal structure of the relay lead was CL element corrosion and fracture. In order to verify the conclusions of the failure analysis, determine the path of introduction of CL elements, and carry out the material substitution, the design of CL corrosion accelerated test section, after six cycles, successfully reproduced the problem of on-site PCB failure for the follow-up product replacement materials, design Improve to provide the theoretical basis.