基于热带海洋大气环境下机载PCB板的环境适应性对比研究  

Environmental Adaptability of Airborne PCB Based on Tropical Marine Atmospheric Environment

作　　者：李茜 胡涛 刘溅洪 郭赞洪 王玲[1] 牟献良[1] LI Qian;HU Tao;LIU Jianhong;GUO Zanhong;WANG Ling;MU Xianiang(Southwest Institute of Technology and Engineering,Chongqing 400039,China)

机构地区：[1]西南技术工程研究所,重庆400039

出　　处：《装备环境工程》2024年第2期104-111,共8页Equipment Environmental Engineering

摘　　要：目的 通过机载PCB板(Printed Circuit Board,PCB)在热带海洋大气环境下的腐蚀老化特征和电气性能退化规律分析,研究其在热带海洋大气环境下的环境适应性。方法 根据热带海洋大气环境中PCB板的实际使用环境大多为舱室内部封闭或半封闭的情况,分别设计并开展海南万宁海洋平台棚下暴露场和某海域环境户外简易遮蔽玻璃框下3 a的自然环境试验。结果 PCB板的焊点、焊盘、印制导线以及引线头等部位在2种试验环境中均出现了不同程度的腐蚀破坏,试验后期,所有部位的腐蚀程度全部达到了4级,导通电阻从几十毫欧增大至几十兆欧,绝缘电阻从10 G?以上降低至几兆欧。结论 在万宁站试验2 a和某海域试验3 a后,PCB板均不满足耐电压的技术要求(500 V交流电压60 s),万宁海洋平台棚下暴露场对PCB板的环境适应性更为严酷。The work aims to study the environmental adaptability of airborne PCB(Printed Circuit Board,PCB)in tropical marine atmospheric environments by analyzing its characteristics and electrical performance degradation patterns.According to the situation where the tropical marine atmospheric environment was mostly enclosed or semi enclosed inside the cabin,natural environmental tests were designed and carried out for 3 years on the exposed field under the canopy of the Wanning Marine Platform in Hainan and the outdoor simple shielding glass frame in a certain sea area of the Nansha environment.The solder joints,pads,printed wires and lead heads of the PCB had different degrees of corrosion damage in the two test environments,and the corrosion degrees of all parts in the later stage of the test reached level 4.The on-resistance increased from tens of mΩto tens of MΩ,and the insulation resistance decreased from more than 10 GΩto MΩ.Finally,the PCB after 2 years of testing at Wanning Station and 3 years of testing in a sea area cannot meet the requirement of technology(AC 500 V,60 s).The environ-mental adaptability of the exposed field under the shed of Wanning Marine Platform to PCB is more severe.

关 键 词：PCB板 热带海洋大气环境 自然环境试验 腐蚀行为 电气性能 环境适应性 

分 类 号：TM207[一般工业技术—材料科学与工程]