印制电路板防护工艺热带海洋环境适应性研究

发布时间：2018-04-25 09:40

本文选题：印制电路板 + 防护工艺　；参考：《华南理工大学》2015年硕士论文

【摘要】：印制电路板(Printed circuit board,PCB)是电子设备的主要功能承载单元,印制电路板的性能表现直接决定电子设备及其组成的系统的环境适应性水平。环境适应性是产品在寿命期内预计可能遇到的各种环境的作用下能实现其所有预定功能、性能和不被破坏的能力,是产品的重要质量特性之一。热带海洋环境条件具有高温、高湿、高盐雾和霉菌生长活跃的特点,高温高湿(即“湿热”)、盐雾和霉菌环境条件对印制电路板的腐蚀老化作用显著。为加强印制电路板的防护性能和电气性能,一般都要在印制电路板组装件表面涂覆敷形有机涂层。因此,研究热带海洋环境条件下印制电路板涂覆工艺的环境适应性水平,对提高电子设备及系统长期在海上作业时的功能、性能稳定性具有重要意义。本论文以五种典型的印制电路板防护涂层工艺为研究对象,制定试验方案,开展试验研究与分析,提出改进建议措施,并进行验证。主要研究内容及成果包括:1.由于目前没有可以直接采用的试验方案,本论文在分析南海热带海洋环境的主要条件及其影响,研究印制电路板标准样品的制备要求、性能参数的检测要求和试验方法要求的基础上,制定了印制电路板防护工艺热带海洋环境适应性试验方案;2.开展实验室模拟环境试验和18个月西沙热带海洋自然暴露环境试验,定期对印制电路板防护工艺主要敏感性能指标进行检测,研究两种试验条件下印制电路板防护工艺的性能变化规律,试验结果表明,实验室环境试验条件下,相对于湿热和霉菌环境,盐雾对印制电路板的腐蚀破坏作用最为明显,自然大气暴露试验条件下,印制电路板的防护涂层在试验18个月后性能参数已经降低至极差的水平;3.提出提高印制电路板防护工艺热带海洋环境适应性水平的建议措施,采取措施重新制备试验样品后开展了试验验证,验证试验结果表明,改进后的印制电路板防护性能良好,在实验室的模拟环境试验条件下外观和电气性能均未出现明显的变化,改进措施具有较显著的效果。
[Abstract]:Printed circuit printed circuit (PCB) is the main functional bearing unit of electronic equipment. The performance of printed circuit board directly determines the environmental adaptability of electronic equipment and its composed system. Environmental adaptability is one of the important quality characteristics of a product, which can realize all its predefined functions, performance and ability not to be destroyed under the action of all kinds of environments expected to meet in the life cycle. The tropical marine environment conditions have the characteristics of high temperature, high humidity, high salt fog and active growth of mold. The corrosion aging effect of high temperature and high humidity (i.e. "damp and hot"), salt fog and mold environment on printed circuit board (PCB) is remarkable. In order to strengthen the protective and electrical properties of printed circuit board, the surface of printed circuit board assembly should be coated with organic coating. Therefore, it is of great significance to study the environmental adaptability level of printed circuit board coating process in tropical marine environment to improve the function and performance stability of electronic equipment and system in offshore operation for a long time. In this paper, five typical protective coating processes of printed circuit board (PCB) are taken as the research object, the experimental scheme is established, the experimental research and analysis are carried out, and the improvement measures are put forward and verified. The main research contents and results include: 1. Since there is no direct test scheme, this paper analyzes the main conditions and effects of the tropical marine environment in the South China Sea, and studies the preparation requirements of the PCB standard samples. On the basis of testing requirements and test methods for performance parameters, a test scheme for the adaptability of the protective process of printed circuit board to tropical marine environment was developed. Laboratory simulated environmental tests and 18 months of natural exposure tests in Xisha Tropical Ocean were carried out, and the main sensitive performance indexes of PCB protection technology were regularly tested. The performance change of PCB protection technology under two kinds of test conditions is studied. The results show that the corrosion and damage effect of salt fog on PCB is the most obvious compared with wet heat and mold environment in laboratory environment. Under the condition of natural atmospheric exposure test, the performance parameters of the protective coating of printed circuit board have been reduced to a very low level after 18 months of test. The measures to improve the adaptability of the protective process of printed circuit board to the tropical marine environment are put forward. The test results show that the improved printed circuit board has good protective performance after the test samples are reprepared. There is no obvious change in appearance and electrical performance under the condition of simulated environment test in laboratory, and the improvement measures have obvious effect.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN41

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