Electronics Forum | Tue Mar 15 17:58:56 EST 2005 | darby
Mat, Are you sure you should be using SnPb HASL boards if you are doing prep for lead free? If you aren't actually going to comply with RoHS then fire away. Nearly all of our assemblies are now ENIG and as any re-design comes up on a HASL board it is
Electronics Forum | Fri Sep 13 14:35:03 EDT 2002 | davef
Thanks Bernard. On your profile: Adding gold to your solder alloy will increase the liquious temperature. So slowing your reflow oven conveyor is a perfectly reasonable approach, especially for pads with low surface area. We don't even notice a di
Industry News | 2018-10-18 10:16:53.0
Solder Tinned Pads vs Gold Plated Pads - The Importance of Selecting the Proper Surface Finish
Technical Library | 2021-04-08 00:30:49.0
As the electronic industry moves to lead-free assembly and finer-pitch circuits, widely used printed wiring board (PWB) finish, SnPb HASL, has been replaced with lead-free and coplanar PWB finishes such as OSP, ImAg, ENIG, and ImSn. While SnPb HASL offers excellent corrosion protection of the underlying copper due to its thick coating and inherent corrosion resistance, the lead-free board finishes provide reduced corrosion protection to the underlying copper due to their very thin coating. For ImAg, the coating material itself can also corrode in more aggressive environments. This is an issue for products deployed in environments with high levels of sulfur containing pollutants encountered in the current global market. In those corrosive environments, creep corrosion has been observed and led to product failures in very short service life (1-5 years). Creep corrosion failures within one year of product deployment have also been reported. This has prompted an industry-wide effort to understand creep corrosion
Corrosion Resistance of Different PCB Surface Finishes in Harsh Environments SMTnet Express August 9, 2012, Subscribers: 25369, Members: Companies: 8949, Users: 33450 Corrosion Resistance of Different PCB Surface Finishes in Harsh Environments
Surface Mount Technology Association (SMTA) | https://www.smta.org/knowledge/journal.cfm
. Hofmann, I. Schubert, D. Wünsch, R. Ecke, K. Vogel, K. Gottfried, D. Reuter, M. Rennau, S.E. Schulz, T. Geßner Abstract 30-1 On the Corrosion Mechanisms of Common Printed Circuit Board Surface Finishes in Three Different Sulfur-Rich Environments Matthew D. Weeks, Ph.D., David J
.gif)
winsouce.jpg)
