亚洲a级在线观看|夫妇交换性3中文字幕|在线看片网站,欧美激情狂野,91视频社区,精品电影一区二区三区

Application：

Through the change of chemical potential of copper ion, Sn2+ in plating solution is in replacement reaction with copper surface of PCB to generate silver white tin layer with thickness of about 1μm on copper surface; it is the most ideal process to substitute tin spraying. Immersion tin applies to fine-circuit and dense-circuit PCB as well as Press-fit plug-in technique, and is suitable for lead-free SMT, and meets the requirements for multiple welding. The process applies to horizontal and vertical line.

Advantage introduction：