after your lesson, my next car will be a RR, or maybe even better, a Trabant.
/Inge
-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: den 17 januari 2008 10:34
To: TechNet E-Mail Forum; Hernefjord Ingemar
Subject: Re: [TN] SV: [TN] SV: [TN] Solderability of Tin-Gold Intermetallic
1. It doesn't take much corrosion to reduce the solderability.
2. It's the base metal that will corrode 3. My wedding ring, after 49 years, this year, is a lot thinner than it was. Who can say whether the wear is purely mechanical abrasion or partially corrosion at molecular levels, bearing in mind that potential corrosion products would probably be easier to wear off?
4. In this country, many bronze age gold artefacts in the Cyprus Museum are visibly corroded after being buried for 3 or 4 millennia: granted I have no idea of the purity of the gold, but I imagine it is reasonably high from the brilliance of the pieces.
5. Analogically, 100% pure iron does not rust. It requires an impurity, such as an iron carbide crystal, forming an electrochemical couple, moisture and probably CO2 to allow rusting (corrosion) to occur.
Anyway, it was just a hypothetical thought!!!
Brian
Hernefjord Ingemar wrote:
> So, a gold/copper alloy wedding ring will fall apart if your finger is wet...hmmmm...but it will take some time, wuntit?
> /Inge
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
> Sent: den 17 januari 2008 09:23
> To: [log in to unmask]
> Subject: Re: [TN] SV: [TN] SV: [TN] Solderability of Tin-Gold
> Intermetallic
>
>
> Can I add a wee bittie more hypothesis to the arguments? The electrochemical potentials of gold and tin differ by 1.8295 V, which is boooody enormous. In the presence of humidity, it is conceivable that important corrosion currents could flow between gold-rich and tin-rich areas on the surface...
>
> ???
>
> Brian
>
> Werner Engelmaier /* wrote:
>> Hi Inge,
>> I visited Gerd Becker twice in Swedenâ besides being a great guy, he
>> was of course Eicsson's soldering guru.
>>
>> Werner
>>
>>
>>
>> **************
>> Start the year off right. Easy ways to stay in shape.
>>
>> http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489
>>
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