关于微带电路金属镀层的探讨

通过对聚四氟乙烯基铜制微带电路几种不同金属镀层的测试研究,探讨了铜制微带电路表在节金、代金的镀覆途径,达到了节金、代金的目的.     

Review of the 9th European Pulse Plating Seminar and EAST Forum 2020

ABSTRACT

The biennial conference, European Pulse Plating Seminar was held on March 5th and 6th in Vienna for the ninth time. As has become a tradition, the conference was organised as a joint two-day event together with the annual EAST Forum. Owing to this unique combination, the audience had the opportunity to follow talks about various aspects of modern electrochemistry as well as about the recent developments in the field of pulse electrochemistry/electrodeposition.     

耐电镀光致抗蚀干膜对化学镀镍镀层的影响

文章从FPCB生产案例金裂问题出发,研究讨论了耐电镀光致抗蚀干膜对化学镀镍药水pH值、镀层厚度、表面形貌和脆性的影响,并采用弯折法定性研究了干膜对化学镀镍镀层脆性的影响。结果显示干膜在化学镀镍药水中长时间浸泡使溶出物大量积累会增大化学镀镍镀层脆性。     

The use of ultrafiltration for treatment of spent solventcleaning rinses from nickel-plating operations: membrane material selection study

Solvent-resistant hollow-fiber OF membranes were selected by measurement of fiber swelling and treatability studies on spent solvent cleaning rinse. The experimental results indicated that the membranes made of both cellulose acetate (CA) and polyacrylonitrile (PAN) materials could tolerate the solvent present and were suitable for treating the spent solvent rinses, whereas polyethersulfone and polysulfone membranes were not suitable. The CA membrane had the lowest fouling tendency when treating the spent solvent rinse. The results also showed that retentions of the emulsified solvent and oil-grease for the CA membrane were above 96% and 80%, respectively, and the PAN membrane had better retention than the CA membrane. It was hypothesized that there might be a critical micellar concentration for oil-grease for the PAN membrane.     

高频编码信号采集与存储系统研究

为了能够在速度快、频率高、冲击大、体积小等恶劣环境下,精确测得高频编码信号。设计了有针对性的采集、存储系统。通过分析信号特点,选取高性能匹配芯片EP3C16作为主控制器。考虑电磁干扰等因素,利用Cadence软件进行高速PCB设计,并对电阻匹配网络进行设计仿真,数据存储采用乒乓存储技术,并利用Quartus II进行模拟仿真。在电路板布线、阻抗设计上都进行了相应地抗干扰预防处理。应用设计的系统对500MHz实测信号进行采集验证,结果证明了系统具有抗干扰、稳定、可实现的特点。     

微米级镀银铜粉的镀层结构及热稳定性

为了提高铜粉的热稳定性,采用滴入化学镀法在铜粉末表面包覆一层金属银,用SEM、X射线衍射(XRD)、粒度分布和热重分析表征了不同包覆厚度的镀银铜粉和原始铜粉的表面形貌、表面结构及抗氧化性.结果表明:铜粉表面镀层结构与银离子形核长大机制和银含量有关;镀银铜粉的热稳定与表面镀层结构有关;完全包覆结构的镀银铜粉具有较好的热稳定性,抗氧化温度可以达到800℃以上.     

电镀Au—Cu—Cd合金

研究了无氰亚硫酸盐溶液镀Ａｕ－Ｃｕ－Ｃｄ合金技术。引入合适的络合剂,改进镀液的稳定性。镀层组分Ａｕ７５％±５％,Ｃｕ２２％±４％,Ｃｄ３％±１％,硬度（Ｈｖ）３６０～３８７ｋｇ／ｍｍ２,镀层耐磨耐腐蚀,电阻率１８３６～１８４４μΩ·ｃｍ,当正压力为２５ｇ时,接触电阻２～４ｍΩ。可用于要求耐磨的高可靠电接触装置以及装饰、防护性电镀部门。     

利用沸石去除电镀废水中重金属离子的试验研究

天然沸石经过适当改性后用于去除电镀废水中重金属离子的试验结果表明:沸石具有较好的离子交换性能,可同时去除电镀废水中的Zn,Cr,Ni等重金属离子,以确保电镀废水达标排放。采用沸石进行电镀废水处理时,其最佳过流速度为4～5m/h,此时,Zn,Cr,Ni的有效去除率分别达到80%,60%,40%以上,工作周期可长达12h以上。     

金合金电镀的发展

介绍几种金基合金电镀的发展历程,比较几种镀液的性能特点并讨论几种金合金电镀的现况及未来的发展趋势。     

电刷镀修复发动机上曲轴箱轴承益的新途径

通过对１２１５０Ｌ柴油发动机上曲轴箱轴承盖的工况和失效原因的分析,提出了修复该零件的新工艺,拓展了电刷镀技术的应用领域,并解决了简单、准确快速的测量方法,此应用提高了１２１５０Ｌ柴油发动机的大修质量和经济效益。