2007-12-29 14:42:39 · 4 answers · asked by mevin217 1 in Science & Mathematics ➔ Chemistry
The gold is stripped from the cathode by use of aqua regia which strips the nickel coat but does not affect the underlying titanium or tantalum.
http://www.freepatentsonline.com/4097347.html
Iridium is not attacked by any of the acids nor by aqua regia.
www.platinacasting.com/information/index
Only a few metals are not attacked by aqua regia, like Ir, Ru, Rh. Especially Ir withstand attacks from all acids even when finely divided.
http://www.scienceforums.net/forum/showthread.php?t=10016
2007-12-29 17:27:29 · answer #1 · answered by Anonymous · 0⤊ 0⤋
tantalum, iridium, and a few other metals are able to withstand it
2007-12-29 22:49:17 · answer #2 · answered by jchinique 3 · 0⤊ 0⤋
sodium metal
2007-12-30 00:06:57 · answer #3 · answered by Varaprasad 4 · 0⤊ 0⤋
I would guess Monel.
2007-12-29 22:47:04 · answer #4 · answered by jimmymae2000 7 · 0⤊ 0⤋