Hi Erik/Dave - I suggest that an ion chromatography (IC) test be conducted to see if the chlorine was absorbed into the soldermask or other surfaces of the circuit assemblies. There is a large body of data that shows that chlorine will cause reliability problems in terms of corrosion phenomena. There may be a better test than IC to determine if chlorine could be absorbed and/or be mobile - maybe Doug Pauls or Susan Mansilla can suggest a test method. Dave Hillman Rockwell Collins [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: Chlorine damage to electronics (fwd) Author: [log in to unmask] at ccmgw1 Date: 6/16/97 1:56 PM Can anyone on TechNet help? Thanks Dave Bergman, IPC ---------- Forwarded message ---------- Date: Mon, 16 Jun 1997 10:47:23 +0000 From: Erik Ievins <[log in to unmask]> To: Dave Bergman <[log in to unmask]> Subject: Chlorine damage to electronics Hi there. This is additional information for the voicemail message I left you earlier this morning. Can you help me get this question to the right person? I would greatly appreciate it. We've got a situation where electronic circuit boards were exposed to dry chlorine gas for several hours. Many of the IC chips have failed, but other than a few exposed ends of copper wire turning brown, there is no visible evidence of corrosion on the boards. I know that there would likely have been significant evidence if the ambient humidity had been higher, due to formation of hydrochloric acid. Can chlorine gas molecules penetrate the plastic IC housings and attack the tiny, gold connecting wires inside the chips? Or is there some other explanation? Thanks very much! ______________________________________________________________ Erik L. Ievins, technical consultant. LWG, Inc. (847)559-3008 ext 276 Smile, the world will wonder what you're up to. :) *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************