Can somebody help me?
- Thread starter BAKARAT
- Start date
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Barren Realms 007
In Remembrance
If you are trying to disolve the contacts(which should be a silver mix with other metal) Use very little nitric and use a 50/50 solution with water. Have you applied heat to this to help the reaction.
arthur kierski
Well-known member
if nitric does not dissolve ,it may be a higher pm then pd or ag----lets hope
regards Arthur
regards Arthur
if high current relay could have tungsten with silver. also some relays use a coating of gold, or other platinum group metals, or metal oxides, they usually are high silver alloys.
If you continue to have problem with nitric can try HCL and peroxide.
If tungsten excess H2O2 helps.
and heat helps also.
there are other ways to deal with tungsten if that is your brick wall.
I have made post about contacts and what you may find in them.
If you continue to have problem with nitric can try HCL and peroxide.
If tungsten excess H2O2 helps.
and heat helps also.
there are other ways to deal with tungsten if that is your brick wall.
I have made post about contacts and what you may find in them.
I have some of these i'm harvesting from relays now. The data sheet on my specific relay said it was nickel-silver alloy. Like barren said try diluted nitric and use heat. I might run into this later myself. I also have about 200-300 of those that have little gold bars like the ones you see also.
Bakarat, don't worry so much about your english, can you ask the question again, I did not quite understand it.
silver can be very hard to disolve in a chloride, you can with heat and a high quantity of oxidizer, but it is not easy.
silver dissolves easy in nitric acid
if points are coated in gold, nitric may have a hard time getting through it,
tungsten is another metal hard for acids to attack.
when I search for datasheets, I type in the numbers of electronic component( if you are not sure with number is the component try different combinations of the number on the component as some of those numbers are date codes etcetera), and write data sheet or specifications on google line, using the manufactures name sometimes helps, or go to the manufacture's web site, search their site for datasheet, some components may have a logo instead of a name, search logo's till you find their name and website. alot of them will have specifications of metals used, or its application and contact rating which can also be a clue to the metals used.
Have you tried a cell? I have made bars, from large lots of mixed points, (the tungsten ones are awfully hard to melt), I dont try to get all of them melted completely,just into bar form, and then used an electrochemical cell to break them down to powders, then treat the powders with acids.
silver can be very hard to disolve in a chloride, you can with heat and a high quantity of oxidizer, but it is not easy.
silver dissolves easy in nitric acid
if points are coated in gold, nitric may have a hard time getting through it,
tungsten is another metal hard for acids to attack.
when I search for datasheets, I type in the numbers of electronic component( if you are not sure with number is the component try different combinations of the number on the component as some of those numbers are date codes etcetera), and write data sheet or specifications on google line, using the manufactures name sometimes helps, or go to the manufacture's web site, search their site for datasheet, some components may have a logo instead of a name, search logo's till you find their name and website. alot of them will have specifications of metals used, or its application and contact rating which can also be a clue to the metals used.
Have you tried a cell? I have made bars, from large lots of mixed points, (the tungsten ones are awfully hard to melt), I dont try to get all of them melted completely,just into bar form, and then used an electrochemical cell to break them down to powders, then treat the powders with acids.
when i search google i find this:View attachment 47W.pdf
(gold over silver)
(gold over silver)
As butcher said, if the gold layer is thick enough, the nitric will not penetrate through it in order to attack the silver. It sounds like that is what happened.
