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From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Mon, 14 Dec 2009 12:38:27 -0600
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You could also possibly seal them up with the various methods suggested, and then subject the package to steam-aging. This would simulate long term storage under the worst of conditions.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of bob wettermann
Sent: Monday, December 14, 2009 12:14 PM
To: [log in to unmask]
Subject: Re: [TN] Storing of Copper Sheets

Dear Technettters:

Thanks for your previous grim assessment of the possibility of extending the shelf life of the tin-coated copper sheets. 

Since then we have discovered that there may be several commercial products-namely corrosion inhibiting bags and papers, that could help in this particular circumstance. Their chemistry allegedly "coats" and "protects" the surface of the metals to inhibit rust and oxidation.

The recommendation from several 
corrosion barrier bag companies is to place several of the approx 1mil tin-coated 
(at some point it may be soldered to) sheets into a specially-formulated PE bag. This bag through volatilization and 
contact will protect the sheets against rust, oxidation. Allegedly it inhibits corrosion as well 
as oil, water and moisture. The manufacturers are telling us 
that one can expect efficacy of 18-24 months after heat sealing each bag which 
could contain no more than 50mm thick in materials. Some manufacturers suggested 
interleaving similar "saver papers" every 3-5 sheets. They will be stored in a 
temperature-controlled approximately 68-72F low humidity level environment.

Does anyone have experience with some of these products? Do we believe what we are being told?

Regards

Bob Wettermann

PH 847-767-5745

--- On Thu, 12/10/09, Douglas Pauls <[log in to unmask]> wrote:

From: Douglas Pauls <[log in to unmask]>
Subject: Re: [TN] Storing of Copper Sheets
To: [log in to unmask]
Date: Thursday, December 10, 2009, 10:55 AM

Nope, been a resident of Deweyville for many years now.  Been thinkin' of 
runnin' fer mayor next year.......

Doug Pauls



Steven Creswick <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
12/10/2009 10:06 AM
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Re: [TN] Storing of Copper Sheets






Doug,

You are treading into Dewey's territory now...  :-)

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, December 10, 2009 9:16 AM
To: [log in to unmask]
Subject: Re: [TN] Storing of Copper Sheets

Though one would have to ponder if this would lead to cold solder 
joints......

Doug Pauls



"David D. Hillman" <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
12/10/2009 07:33 AM
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Re: [TN] Storing of Copper Sheets






Hi Steve! Not off the top of my heat. I am pretty sure I have the 
activation energy in my database somewhere but it would take some time to 
dig it out. As Syed pointed out, there is going to be a diffusion limit or 


at least  a practical limit point where which would make freezing copper 
sheets an action worth taking.

Dave



Steven Creswick <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
12/09/2009 07:24 PM
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Re: [TN] Storing of Copper Sheets






Dave,

Any idea what the average net activation energy might be??

Steve C

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Syed Ahmad
Sent: Wednesday, December 09, 2009 6:53 AM
To: [log in to unmask]
Subject: Re: [TN] Storing of Copper Sheets

Depends upon activation energy?!

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Tuesday, December 08, 2009 4:59 PM
To: [log in to unmask]
Subject: Re: [TN] Storing of Copper Sheets

Yes, freezing would extent the time some length but I don't know 
specifically how long without running the numbers thru the diffusion 
equation.

Dave



"John Burke" <[log in to unmask]> 
12/08/2009 04:55 PM

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"'TechNet E-Mail Forum'" <[log in to unmask]>
Subject
RE: [TN] Storing of Copper Sheets






But will push the time frame out right?
 
John Burke
(408) 515 4992
 
 

From: [log in to unmask] [mailto:[log in to unmask]] 
Sent: Tuesday, December 08, 2009 2:51 PM
To: John Burke
Cc: 'TechNet E-Mail Forum'
Subject: RE: [TN] Storing of Copper Sheets


Hi John - yes, if that deep freeze is in liquid nitrogen - otherwise 
diffusion is still going to progress on its merry way to the same end 
result. Standard freezing temperatures will not slow down the diffusion 
process enough to prevent degradation. 

Dave 


"John Burke" <[log in to unmask]> 
12/08/2009 04:48 PM 


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RE: [TN] Storing of Copper Sheets








Unless of course he stores them in the deep freeze........ 


John Burke
(408) 515 4992


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
Sent: Tuesday, December 08, 2009 2:40 PM
To: [log in to unmask]
Subject: Re: [TN] Storing of Copper Sheets

Hi Bob - unfortunately you are going to lose the solderability of those
sheets somewhere in the 6-12 month time frame depending on which immersion
tin formulation you are using and due to diffusion issues will lose the
solderability of the sheets on a permanent basis somewhere in the 12-24
month time frame depending on the thickness of the immersion tin plating. 
You may be able to "reactive" the surface for some other operation but you
will need to somehow make sure the surfaces to not passivate (aka oxidize)
preventing the next process operation. My recommendation is talk to your
favorite plating supplier. Good Luck.

Dave Hillman
Rockwell Collins
[log in to unmask]



bob wettermann <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
12/08/2009 11:11 AM
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[TN] Storing of Copper Sheets






Dear Technetters:

If you planned on storing 10z copper sheets with a bright immersion tin 
coating for several years in 24 x 24" sheets-how would you do it?

We have several internal opinions from interleaving of saver paper to 
moisture barrier bags to other types of bags.

Thanks!

Bob Wettermann

PH 847-767-5745

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