A
Anonymous
Guest
I have been away from gold recovery for a while.
I have gold plated connector pins still in the plastic body salvaged from industrial welder control boards that are not showing much of a change when placed in a freshly mixed AP bath.
I first thought it was something like the base material being resistant to AP.
Some of the metals have been affected.
Some, but not very many, are actually fully dissolved.
There is a fair amount of solder on most of the pin ends.
Does the presence of solder in the solution neutralize the ability of the AP to work?
A few days later I tried some computer header connectors in a fresh batch of chemical and am finding the same results.
(No solder on these.)
Basically nothing much happening.
Added low heat.
Added a bubbler.
Still nothing.
Started both over again with a fresh mix of chemicals.
Still nothing.
I am using the same brand of concrete cleaner (32%HCL) that worked fine for me before.
The hydrogen peroxide is a different brand.
The HCL is from a half full jug I was using before.
Does HCL lose its potency when exposed to air?
This jug sat as half liquid/half air for several months.
If what I am thinking is true, exposure to air causes a loss of potency, then what special precautions should I take to not waste half of the jug that I am getting ready to open?
I do not remember what brand of peroxide I had before.
Just whatever Dollar General has in stock. (It changes)
Anybody have any thoughts or similar experience?
Thanks,
Ideal-Wirenut
I have gold plated connector pins still in the plastic body salvaged from industrial welder control boards that are not showing much of a change when placed in a freshly mixed AP bath.
I first thought it was something like the base material being resistant to AP.
Some of the metals have been affected.
Some, but not very many, are actually fully dissolved.
There is a fair amount of solder on most of the pin ends.
Does the presence of solder in the solution neutralize the ability of the AP to work?
A few days later I tried some computer header connectors in a fresh batch of chemical and am finding the same results.
(No solder on these.)
Basically nothing much happening.
Added low heat.
Added a bubbler.
Still nothing.
Started both over again with a fresh mix of chemicals.
Still nothing.
I am using the same brand of concrete cleaner (32%HCL) that worked fine for me before.
The hydrogen peroxide is a different brand.
The HCL is from a half full jug I was using before.
Does HCL lose its potency when exposed to air?
This jug sat as half liquid/half air for several months.
If what I am thinking is true, exposure to air causes a loss of potency, then what special precautions should I take to not waste half of the jug that I am getting ready to open?
I do not remember what brand of peroxide I had before.
Just whatever Dollar General has in stock. (It changes)
Anybody have any thoughts or similar experience?
Thanks,
Ideal-Wirenut
