Subject: Re: Reducing contact resistance for low volt use?
Summary: What do you think of these ping times eh?
Reply-To: You can't see me, and I pass right through planets...
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Date: Wed, 08 Jan 2003 01:52:14 GMT
NNTP-Posting-Date: Tue, 07 Jan 2003 20:52:14 EST
On Tue, 7 Jan 2003 23:42:04 +0000, John Woodgate
>I read in sci.electronics.design that DarkMatter endoftheuniverse.org> wrote (in com>) about 'Reducing contact resistance for low volt use?', on Tue, 7
>> Yet another proof that silver oxides are far more desirable in
>>contact faces than copper oxide would be.
>Silver doesn't form an oxide in air. That black stuff is silver sulfide.
>> Yes. Note that I said this above. That galvanic response is due to
>>the porosity of the plating. It takes form in the way of allowing
>>oxygen into the area where the two metals interface. Though the
>>mechanism is galvanic, the product is copper and silver oxides.
>Silver won't oxidise in the presence of copper metal.
It is the copper/silver interface that does the corrosion formation.
Only when oxygen is present, however.
If one reads the mil spec, in the section regarding red plague
corrosion, one will find that it is the COPPER that gets exposed to
oxygen via thin. porous plate thickness areas, that undergo the
galvanic responses. No current flows are needed just air.
> Alternatively, if
>the mechanism were the electrolysis of water, the copper would not
>oxidise; any oxide would be reduced by the electrolytic hydrogen.
Think military. Navy. SALT water. Dissimilar metals. Look at the
statue of liberty before the refurb. Thick silver platings hide the
copper/silver interface from the air, and provide a better metal for
exposure to whatever elements. If one looks at the silver atom, it
appears obvious that it is the best conductor. The nucleus is
shrouded by 46 electrons, not counting MR. valence, El Looso Electro
Anyway... Silver is where it's at!