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Subject:	Re: Red plaque on Silver plated wire?
From:	[log in to unmask]
Reply To:	TechNet E-Mail Forum.
Date:	Tue, 4 Dec 2001 07:43:00 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (44 lines)

David Douthit exclaims:

First; trying to grow dendrites in a 85/85 environment is difficult at
best. Dendrites
require liquid water. the free energy at 85 degrees C is to high. It will
not allow a liquid
water film to form. you must be below 40 degrees C to ensure the formation
of liquid water.

Doug Pauls, well into his second Mt. Dew of the day, responds:
No it doesn't, no it doesn't, no it's not, yes it will, and no you don't,
respectively.

It is not hard to grow dendrites, I do it frequently. Anyone who does SIR
testing will say the same. I've even grown dendrites on gold samples.
Dendritic growth takes moisture, bias and an ionic contaminant. The
greater the magnitude of these factors, the greater the propensity for
dendritic growth. Yes, most dendritic growth requires liquid water, but
you only need a few molecular thicknesses to do this, which is easily
attained at 85/85. Yes, liquid water can form at 85/85. All you need is a
1-2 degree difference in temperature between the environment and your
substrate and poof, water. When water forms, temperature wise, depends on
the relative humidity and the temperature. SIR testers, if they have done
it long enough, have had an occasion where power goes out on the chamber
and the temperature drop while the humidity remains high. You rapidly
reach the dew point well above 40C.

I'm sure Brother Ellis in Cyprus can expound on the physics in greater
depth.

Doug Pauls
Rockwell Collins

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