Cheers folks! Thanks for the link to the data, thought you may pop up! Regards, Iain. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman Sent: 01 May 2008 17:04 To: [log in to unmask] Subject: Re: [TN] De-golding? *** WARNING *** This mail has originated outside your organization, either from an external partner or the Global Internet. Keep this in mind if you answer this message. Hi folks! Ok, here is the science: Gold dissolves into a Sn60Pb40 solder bath 1 um (40 uinches) per second at 200C (W. Bader's data). So at 500F (260C) you increase the dissolution rate to over 4um (160 uinches) per second. Contrast those dynamics with these elements using a Sn60Pb40 solder bath : Palladium dissolves at 1 um per second at 400C: Nickel dissolves at 1 um per second over 500C! Dave Hillman Rockwell Collins [log in to unmask] Werner Engelmaier /* <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 05/01/2008 10:15 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to [log in to unmask] To [log in to unmask] cc Subject Re: [TN] De-golding? Hi Dean, No science--it just works.? Actually, any T above the Liquidus of solder will work, higher T's will work faster. Werner -----Original Message----- From: Stadem, Richard D. <[log in to unmask]> To: [log in to unmask] Sent: Thu, 1 May 2008 11:01 am Subject: Re: [TN] De-golding? Good question. We use 500 deg. F. because we run our wave solder at 500 deg. F. and because 500 degrees F. is what we have been tinning at for a long, long time, at least since the late 60's. I have no idea whether that is the optimum temperature for dynamic wave tinning or not. I do know that at least 9 companies in the Minnesota area, three in North Dakota, and two in South Dakota all tin their parts at 500 deg. F. also. I'm sorry I cannot tell you the science behind that temperature. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Braddock, Iain Sent: Thursday, May 01, 2008 9:32 AM To: [log in to unmask] Subject: [TN] De-golding? Apologies if this has found its way through before, I got an error sending message from TechNet. What temperature do you use for your SnPb de-golding pots and what is the reason for your particular choice? CIA, Iain ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. 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