xxxxx
Hazard to Others
Posts: 115
Registered: 21-5-2004
Member Is Offline
Mood: No Mood
|
|
tarnish free silver chromium alloy
i was interested in whether the addition of a few percent of chromium could stop silver from tarnihing in the same way chromium copper (2% chromium)
does not oxidize by passivating the oxide coating on the surface of the copper.
even though silver reacts with sulfer compounds in the air instead of oxygen i thought the two reactions might be similar enough for this to work.
could some tell me if this would work and why or why not.
|
|
|
hyfalcon
International Hazard
Posts: 1003
Registered: 29-3-2012
Member Is Offline
Mood: No Mood
|
|
That's why many silver necklaces have a palladium coating electroplated onto them.
|
|
|
elementcollector1
International Hazard
Posts: 2684
Registered: 28-12-2011
Location: The Known Universe
Member Is Offline
Mood: Molten
|
|
I thought it was rhodium?
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
|
|
|
Fleaker
International Hazard
Posts: 1252
Registered: 19-6-2005
Member Is Offline
Mood: nucleophilic
|
|
It can be either, but typically rhodium.
Neither flask nor beaker.
"Kid, you don't even know just what you don't know. "
--The Dark Lord Sauron
|
|
|
hyfalcon
International Hazard
Posts: 1003
Registered: 29-3-2012
Member Is Offline
Mood: No Mood
|
|
Sorry, right family wrong element. What he said.
|
|
|
Poppy
Hazard to Others
Posts: 294
Registered: 3-11-2011
Member Is Offline
Mood: † chemical zombie
|
|
Hilarious, hahahaaha
Then why are they made of silver at all?
|
|
|
elementcollector1
International Hazard
Posts: 2684
Registered: 28-12-2011
Location: The Known Universe
Member Is Offline
Mood: Molten
|
|
I believe it was that sterling silver tarnishes eventually due to the sulfur compounds in the air, and the rhodium is plated over to prevent this.
Although that does raise the question - why bother using sterling? You can't even see it.
Makes rhodium easy for element collectors, though.
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
|
|
|
buzzoff
Harmless
Posts: 2
Registered: 22-8-2012
Member Is Offline
Mood: vitriolic
|
|
Seems to me, that it is the copper content of Sterling Silver that increases its vulnerability to tarnishing. Fine Silver (AKA Pure Silver) resists
tarnishing a lot better.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
