Magnetic vs. non magnetic when using AP solution

[bhilton]

What is the reason everyone seems to separate pins & fingers into magnetic and non magnetic batches?

I've noticed a lot of computer hard drive SATA connector fingers and even some ram and peripheral cards fingers are magnetic, while others are not.

Is the main reason to separate them so that you can treat and re-use the solutions?

E.g. if I do all non magnetic, then I know it is probably mostly copper, so when I'm done, that solution will be a good one to re-use, since it will be mainly copper II chloride. And then if I have all magnetic pins/fingers, the left over solution at the end would be a copper II chloride & iron chloride mix?

I see how you would want to process those materials separately from that point of view, but is there any other reason to separate them?

 

[Yggdrasil]

What is the reason everyone seems to separate pins & fingers into magnetic and non magnetic batches?

I've noticed a lot of computer hard drive SATA connector fingers and even some ram and peripheral cards fingers are magnetic, while others are not.

Is the main reason to separate them so that you can treat and re-use the solutions?

E.g. if I do all non magnetic, then I know it is probably mostly copper, so when I'm done, that solution will be a good one to re-use, since it will be mainly copper II chloride. And then if I have all magnetic pins/fingers, the left over solution at the end would be a copper II chloride & iron chloride mix?

I see how you would want to process those materials separately from that point of view, but is there any other reason to separate them?

The magnetic ones is often Kovar which is a Iron/Cobalt/+ alloy with the same expansion rate as glass.
This will foul the Copper Chloride etch faster so it won't last that long.

 

[bhilton]

The magnetic ones is often Kovar which is a Iron/Cobalt/+ alloy with the same expansion rate as glass.
This will foul the Copper Chloride etch faster so it won't last that long.

Ok that makes sense. When the solution is fouled, does adding more hcl help it work again or would you recommend filtering and moving the pieces to a fresh batch of copper II chloride?

 

[Yggdrasil]

Ok that makes sense. When the solution is fouled, does adding more hcl help it work again or would you recommend filtering and moving the pieces to a fresh batch of copper II chloride?

It help to the point it is too saturated with Iron and what not.

 

[andu]

Separation of pins from sata specifically sata is because the card itself contains a more silver and less gold, and chips than ide. So it could be a reason too.
I have all sata stuff separated from ide/scsi, haven't yet got to the point to think about magnetics.

 

[Yggdrasil]

Separation of pins from sata specifically sata is because the card itself contains a more silver and less gold, and chips than ide. So it could be a reason too.
I have all sata stuff separated from ide/scsi.

Which post was this directed to???
It don't even belong in this thread, what is happening?

 

[andu]

I click on reply and got a quote to the original post in the past thread, on this one I answered directly to the very second phrase in first post of this thread.

What is the reason everyone seems to separate pins & fingers into magnetic and non magnetic batches?

I've noticed a lot of computer hard drive SATA connector fingers and even some ram and peripheral cards fingers are magnetic, while others are not.

 

[Yggdrasil]

I click on reply and got a quote to the original post in the past thread, on this one I answered directly to the very second phrase in first post of this thread.

Well it was gone in the post that got posted, as you see.