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June 2003

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Subject:
From:
Eric Dawson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 10 Jun 2003 12:56:21 +0100
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Hi Ingemar,
Just a suggestion, have you made contract with Dr Wack's chemists in Germany? I worked with them a few years ago and found them to be very responsive and knowledgeable.
Regards
Eric Dawson

> -----Original Message-----
> From: Ingemar Hernefjord (EMW) [SMTP:[log in to unmask]]
> Sent: Tuesday, June 10, 2003 11:54 AM
> To:   [log in to unmask]
> Subject:      [TN] Technical question,  Vigon cleaning
> 
> Hi,
> thought I might interrupt all social q with a tech one?
> Had a chat with Brian long ago about the highly alcalic A200. Today, actual story:  We have made a mistake, machine washed circular receptacles after we had mounted flexes on the backside (of the receptacles). This cleaning agent penetrated to the inside of con body, because it's not potted. Now, that volume consists of numerous gold plated pins, with or without filter caps. Obviously, the A200 caused serious damage to the inside, because we got corrosion, leakage current, and finally ignitions. Connector body is P nickel plated aluminium, and even the body's inside was attacked by some type of corrosion. The corrosion products are blue-green (between pins) or colourless (body inside). EDAX gives high Cl+Cu for the blue-green stuff and high Cl+Ni for the body ditto. The 'dielectric' material, which separates the pins and also tries to make connector tight, is a fluorized silicon + unknown assistive polymer.
> 
> Question is how the corrosion can start so early in the product's life and also how it can go so far, remembering that the pins are goldplated, and that the aluminium body has a very thick and dense nickel plate.
> 
> We have changed to Isopropanol, and have no such problems any more, but we were really scared by the Vigon disaster. Anyone with similar experience?
> 
> Ingemar Hernefjord
> Ericsson Microwave Systems
> 
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