Why Gold Plating is Done in Mobile SIM cards?

[josephcaritel]

Mobile SIMcards are coated with Gold, why we can't use other metals or Alloys for conductivity.

 

[Danger]

I don't know for sure. My first instinct is that it's because gold can't corrode.
Also, it's conductivity is very high.

 

[turbo]

Silver is very conductive, but it oxidizes. Gold is more expensive, but you need very little of it when you're plating electronic contacts.

 

[Grizzled]

We can and do use other coatings. Palladium for instance is quite popular. It's just an issue of required properties (chemical, electric) vs price.