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Subject:
From:
"Whittaker, Dewey (EHCOE)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (EHCOE)
Date:
Fri, 4 Jun 2010 09:58:20 -0700
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Thanks Doug. I told them yesterday this was going to become a heated
discussion.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Friday, June 04, 2010 8:24 AM
To: [log in to unmask]
Subject: Re: [TN] Connectors tarnishing after wash

Amol,
Pardon me if I missed it before, but what is the temperature of your
wash 
process?  We have found before that when we start to have wash 
temperatures above 150F, you start seeing all sorts of odd metal
staining.

Doug Pauls



"Glidden, Kevin" <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
06/04/2010 08:42 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
"Glidden, Kevin" <[log in to unmask]>


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Subject
Re: [TN] Connectors tarnishing after wash






Amol,

It could very well have been related to the exhausted Mixed Bed when the

issue started.  The higher the purity of the DI water, the closer the pH

is to 7.0.  If your feed water and/or recirculated water had a low pH 
(embedded CO2 or acidic flux residues in recirc water(?)), it would not 
have been buffered by the exhausted mixed bed and could have remained 
acidic.

-----Original Message-----
From: Kane, Amol (349) [mailto:[log in to unmask]] 
Sent: Friday, June 04, 2010 7:40 AM
To: [log in to unmask]
Subject: Re: [TN] Connectors tarnishing after wash

Dear all,
Nothing has changed in the wash parameters. The water has an almost 
neutral Ph value. The problem seems to have disappeared as suddenly as
it 
started. Based on what I see it may be:
(a) part issue
(b) changing the mixed bed tank somehow caused this issue (water too
clean 
etc.,). Will keep a look out during the next change
(c) Ph changed due to changing out the mixed bed tank

Thank you all for your responses. Learned something new because of this 
situation.

Regards,
Amol

-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]] 
Sent: Wednesday, June 02, 2010 11:26 PM
To: TechNet E-Mail Forum; Kane, Amol (349)
Subject: Re: [TN] Connectors tarnishing after wash

This is almost certainly an issue from the parts being too clean! When 
drying, the exposed metal oxidises, producing your 'tarnish'. This is 
usually a purely aesthetic problem and is often caused by evaporative 
drying at a too-high temperature. It is better to use mechanical drying 
at a lower temp.

Brian

Kane, Amol (349) wrote:
> 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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WARNING:  Export Control 
This document may contain technical data within the definition of the 
International Traffic in Arms Regulations (ITAR), and subject to the 
Export 
Control Laws of the U.S. Government.  Transfer of such data by any means

to a 
foreign person, whether in the United States or abroad, without proper 
export 
authorization or other approval from the U.S. Department of State is 
prohibited. 
 
CONFIDENTIALITY NOTICE: 
This e-mail, and any attachments, is for the sole use of the intended 
recipient(s) and may contain information that is confidential and 
protected from disclosure under the law. Any unauthorized review, use, 
disclosure, or distribution is prohibited. If you are not the intended 
recipient, please contact the sender by reply e-mail, and delete/destroy

all copies of the original message and attachments. 
Thank you.

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