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Date: | Wed, 25 May 2011 08:11:41 -0500 |
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Technetters,
We have confirmed that a returned product from the field has failed die
to silver sulfide contamination.
The conclusion from the analysis is:
Based on the analysis performed, the “black” contaminant material is
silver sulfide, a common silver corrosion product. This corrosion often
occurs when silver plating is exposed to atmospheric pollution that
contains high levels of sulfur compounds (exhaust from fossil fuels).
We have confirmed that in particular resistor networks are susceptible
due to the silver content that apparently is exposed on the top of the
component. We have not observed issues with any other component types.
The obvious answer to how to protect a product in this environment is to
use conformal coating. However, from what I have read there are only
very few coating materials that can actually protect from silver sulfide
corrosion. Epoxy based conformal coatings is the only ones that will
successfully pass ASTM N 809 test. My question to the experts is if
there are other solutions or coatings you have been successful with or
if someone has actually solved this issue in different ways. It seems
this should be an important issue for the automotive electronics industry.
Some one suggested using solder to cover the component, but I can not
understand how that could work.
As always, thank you for your insight.
--
Leif Erik Laerum
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