http://www.setlaboratories.com/astm.htm

>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Hillman
>Sent: Tuesday, February 04, 2003 3:12 PM
>To: [log in to unmask]
>Subject: [TN] Galvanic Corrosion Testing
>
>
>Hi TechNet! I am on a quest for some information and hoping
>the minds of TechNet can send me charging off in the right
>direction. Rockwell Collins has been very active in
>implementing the new immersion pwb finishes (immersion tin,
>immersion silver, ENIG). The implementation has been very
>successful with few "bumps in the road" being encountered.
>However, one question has arisen that; a) as a metallurgical
>engineer I should have anticipated and b) you would think
>someone else would have solved already. The question is " Is
>there a galvanic corrosion issue with the use of either ENIG
>or immersion silver pwb surface finishes and the aluminum
>chassises/enclosures"? As background,  there is very little of
>the pwb finish in intimate contact with the aluminum chassis
>with most of the contact being aluminum standoff posts
>contacting a circular mounting pad on the pwb. I have spent a
>number of hours looking for some type of galvanic corrosion
>test which I could run to determine if either immersion silver
>or ENIG finishes would be an issue. The two environments I
>have the most interest in are temperature/humidity and salt
>air. I am tentatively going to run an 85C/85%RH and an ASTM
>salt fog exposure on some mockup test sets to see if I have
>any reactions. Has anyone run such a test or can anyone direct
>me to a Mil STD or ASTM standard which deals with galvanic
>corrosion of contacting dissimilar metals?
>
>Thanks in advance.
>
>Dave Hillman
>Rockwell Collins
>[log in to unmask]
>
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