Victor,
I did not have sufficient time to search, but found at least one of my  old
reports. This solder joint was taken for a corrosion issue, but it was not.
Instead it was about copper that had migrated to the surface and then
oxidized. Bad finish, with other words. I post the photo ufflein to you.

Inge

On 29 February 2012 18:32, Inge Hernefjord <[log in to unmask]> wrote:

> Hola amigo; quizás no está una cosa de c. I have seen lots of cases where
> you have misjudged intermetallic formations and taken them for corrosion.
> Typical example is the much discussed ' purple plague ' . So, before
> anything else you should have a look at the object in a high magnification
> optical microscope, or even better, a SEM. I'll  see if I can find pictures
> from my old reports.
>
> By the way, Dave, I have not forgotten your question about the Metal
> Institute report. They have changed business and this antique report has to
> be looked for in the deepest cellars.
>
> Inge
>
>   On 29 February 2012 15:53, Victor Hernandez <[log in to unmask]
> > wrote:
>
>> Fellow TechNetters;
>>
>>   Do No Clean LF fluxes, Rosin Core/molten solder, have a corrosive ion?
>>   Every so often when conducting analysis on Field Return Product I notice
>> small amount of corrosion product on gold plated contact on DIMM and PCI
>> Slot connector.   Sometimes on other gold plated connector leads.   So I am
>> trying to understand which component had a corrosive ion waiting for the
>> right conditions to flourish.   Small amount of greenish/bluish residue.
>> It can be seen on wipe zone and/or stamp edge of contact.   Where is this
>> active corrosive ion coming from?
>>
>>   Can someone provide the link to Stevezea home page for posting pictures?
>>
>> Victor,
>>
>>
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