2021年7月15日 · Too high tin(IV) will increase bath solution turbidity and increase in consumption of total tin to maintain an optimum level of tin(II). Tin(IV) is useless in plating while only tin(II) can be reduced as tin metal. Discoloration during reflow is not related to tin(IV) but probably due to metallic contamination like lead and copper.

2022年6月9日 · Tin discoloration is a natural phenomenon that happens to pure tin plating finishes during soldering at certain temperatures and in certain processes. This color change

2008年8月22日 · Discoloration of immersion tin plating is usually caused by incomplete rinsing. No cost, No passwords, No popup ads, No AI -- just hobbyists & pros helping each other

2012年7月26日 · I have experienced difficulty soldering to tin only plating, using tin/lead alloy solder, within 8 weeks of manufacture on unprotected printed circuit boards. Usually, we see a degradation from shiny tin to a dull white to a dull grey.

2012年2月14日 · Tin discoloration could due to incomplete removal of tin plating solution residues (e.g. MSA) or tin oxidation upon storage. TSP neutralizer can improve thorough rinse off tin plating residues while you may insert additional post dip before final rinse which is so called "solder guard" by form a hydrophobic film on tin surface to repel oxygen ...

2024年3月11日 · Tin discoloration is a natural phenomenon that happens to pure tin plating finishes during soldering at certain temperatures and in certain processes. This color change will not adversely affect the solder or the long-term reliability …

2012年6月1日 · In this work, we studied the reflow discoloration formation on pure tin surface finish by analyzing the effects of impurities on the substrate and the electroplating conditions. Pure tin finish reflow discoloration is induced by surface oxidation of Sn.

At high temperatures nickel diffusion often occurs at the tin sur-face, oxidizes, and additionally pro-motes oxidation of the tin resulting in surface discoloration. This oxidation should...

In this paper we present results of a whisker study wherein matte tin deposits are directly compared with bright tin deposits produced from a new generation of plating electrolytes. It will be shown that deposits can be produced from these

2012年6月1日 · This paper reported on the aspect of the reflow discoloration formation on pure tin finish, and the effects of impurities of the substrate and the electroplating conditions on the tin finish ...