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June 2010

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Subject:
From:
R Sedlak <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, R Sedlak <[log in to unmask]>
Date:
Wed, 2 Jun 2010 13:04:52 -0700
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Amol:
What do you do with parts after DI water rinse?  Bake?
Have you checked pH of your DI water, it can often be acidic, which when combined with baking, could cause oxidation.
How long do you leave parts in rinse?   Longer than 60 seconds is rarely required, and can allow more time for parts to be attacked.
Last, how many rinses do you use?  If you are using tanks/beakers, at least two rinses should be used, with residence in first rinse severely limited.   First rinse is where you accumulate impurities, which, presumably are from flux, making the water more corrosive.
Rudy Sedlak

--- On Wed, 6/2/10, Kane, Amol (349) <[log in to unmask]> wrote:

From: Kane, Amol (349) <[log in to unmask]>
Subject: [TN] Connectors tarnishing after wash
To: [log in to unmask]
Date: Wednesday, June 2, 2010, 12:58 PM

Dear Technetters,
Need some help from metallurgists out there. We have a connector that is tarnishing (turning black-blue) after washing in the water wash (straight up DI water). Almost looks like somebody colored the metal using a black/blue marker.  The solder able surface of the connector (gold over Ni over Cu) as well as the plastic body is perfectly fine. From what I can find out, the connector part that is showing this color is steel with Ni plating. What in the DI water can cause this change? Our mixed-bed tank was exhausted when the issue surfaced (do not know if coincidental). With a new mixed bed, the tarnish is reduced, but still enough to cause rejections.

Any help/pointers will be greatly appreciated.

Thanks,
Amol




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