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Old 08-05-2018, 02:38 PM   #1
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Default Silver Migration

I learn something new every day.

Watching a car repair video in which the electronic dash cluster was causing a parasitic amp draw killing the battery overnight.

Easy diagnosis through Amperage Clamp but cause was not determined until he received the cluster back from reman.

https://www.kurtzersa.com/electronic...migration.html


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Silver has strong tendencies to migrate, since silver oxide is water soluble. The migration of silver on electronic assemblies expresses itself in the formation of conductive paths by wandering metal ions and under the influence of humidity between traces of different potentials. Preferred direction is towards the electric field. This effect is of eminent practical importance in the case of small structures. This migration can lead to malfunction, in the worst case to the total failure of the electronics through shorts. Alloying palladium to the silver can effectively reduce if not inhibit the silver migration. Other metals like copper and tin also tend to migrate, albeit at a slower rate.
Just for your information about circuit boards and possible non visually obvious causations of failure.
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Old 08-05-2018, 02:51 PM   #2
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Quote:
Originally Posted by LARMGUY View Post
I learn something new every day.

Watching a car repair video in which the electronic dash cluster was causing a parasitic amp draw killing the battery overnight.

Easy diagnosis through Amperage Clamp but cause was not determined until he received the cluster back from reman.

https://www.kurtzersa.com/electronic...migration.html




Just for your information about circuit boards and possible non visually obvious causations of failure.
The other keen thing to look for closely is where it say Made in China...........
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Old 08-05-2018, 02:53 PM   #3
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Reminds me of "tin whiskers" that have been blamed for failures in electronic components.
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Old 08-05-2018, 05:22 PM   #4
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Its a large bleed that can drain a battery overnight. Somewhere around 1.5 - 2 amps tracking across a board.
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Old 08-06-2018, 02:30 AM   #5
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Silver migration is a known problem to the old time electronics repairers,
Especially those who fix electronic equipment containing electron tubes.
due to the high voltages involved silver would migrate across the glass base between the pins. doesn't take much voltage in the wrong place to stop a valve based circuit from working.


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