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March 2004

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Subject:
From:
"Chafin, Ken G." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 24 Mar 2004 17:10:37 -0500
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Elemental carbon has been identified as the dark material that has
"developed" on the surface of a pin at the point where it makes electrical
contact with a socket.

The applied voltage in one case is 12 VDC and in another it is 5 VDC.

It is suspected that the high vibration environment in which the device
operates is causing intermittent opening of the contact area and electrical
arcing is causing the carbon deposition.

I believe I have seen literature which identifies atmospheric C0_2 as the
primary source of the carbon (possibly some CO also).

Can anyone refer me to literature which confirms, disconfirms or otherwise
provides enlightenment on the precise nature of this process?

Thanks

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