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Subject:	Re: Gold/Paste
From:	Andrew Hoggan <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Thu, 9 Aug 2001 23:21:05 +0100
Content-Type:	text/plain
Parts/Attachments:	text/plain (62 lines)

Hi Rick,

could be;

a) oxide on the joint

b) change in the composition of the original solder through elemental
contamination from your plating (pad/component) during reflow giving
differential freezing, resulting in a change in the surface appearance

c) the solder you've been supplied with is 'out of spec' (do you have a
spec?) and is freezing differentially

d) all of the above

e) none of the above

Best regards,

Andrew Hoggan
BBA Associates Ltd
www.bba-associates.com



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Rick Howieson
Sent: 09 August 2001 21:53
To: [log in to unmask]
Subject: [TN] Gold/Paste


We are seeing cloudy/grayish smt solder joints on boards with immersion gold
or soft body gold plating. Is this common???
Thanks,
Rick

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