On 2017/03/04 6:05 PM, Phil Allison wrote:
wrote:

** That should be "Silver Sulphide" = Ag2S



True for sterling (.925) silver.
Fine silver - what is deposited by electroplating - does not form
compounds with sulphur at anything near normal room temperatures.



** As you seem to be the only person in the world who thinks that - you need to post a link to back it up.

Do you know what "black leg" corrosion is ?

Commonly seen on the leads of small signal transistors made in Japan in the 70s. It often results in the device going noisy or failing completely. Marantz stereo amps were notorious for it.



..... Phil


Hey Phil,

Can you provide a link to more in depth discussion on your black leg
corrosion? I did a quick search and could only find one reference, and
it merely said watch out for 'black leg corrosion'?

I have run into a lot of Namco branded ICs from Japan, made in the late
70s that have this problem...

Thanks!

John :-#)#

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