Ingemar
I'm not oversurprised by your assertions, but I'm a wee bit puzzled by
how much chloride you found there. I do not think there is any chlorine,
in any form, in Vigon solution - unless you mix it with sea water :-)
This is the first place I'd start asking questions, especially as many
chlorides are poorly soluble in your isopropanol.
Best regards,
Brian
Ingemar Hernefjord (EMW) wrote:
> 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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