sample of resistors

[mocodos]

Hi all,

i tested today a small batch of resistors:

3,05 g of resistors

After boiling in HCL and disolving in AR (4ml HCL and few drops Nitric)

I got a green solution.

I think, the stanus test shows palladium?!

After added few drops DMG i got some green crystals.

What is this green salt?

mocodos

 

[FrugalEE]

I can't answer your question, but I did look up that the resistive traces are usually made of a nickel chromium alloy. I assume you have seen Patnor's post showing terminations as AgPd and Meng has certainly recovered lots of Ag from chip resistors. Keep posting your results, I'm interested.

FrugalEE

 

[patnor1011]

Did you break them to powder? Pd (if it is there) is usually found sandwiched inside that plastic/ceramic body.

 

[patnor1011]

Just thinking loud - Is nitric fully consumed in your AR? In my test sample I dissolved metal with HCl/Cl and I let Chlorine escape.

 

[mocodos]

Hi patnor1011,

i didn´t broke them, i hoped there are penetrated by hot AR.
Today there are no green crystals more, only some yellow precipitate.

I think, the nitric was not realy consumed in AR, the test this morning shows positive for Pd.

This are my first steps in testing small batches, (in a test tube) so i have to train the feeling with small quantities.

Today i will test a another type of resistors. (with more legs).

mocodos

 

[mocodos]

Hi all,

here are the results of the second test:

2.00 g resistors with legs
i cut them to better disolve of base metals
1h in hcl at 90° C
1h in AR at 90° C and denoxing

mocodos

 

[shyknee]

I think you should of tested for silver first

 

[jimdoc]

I seem to remember that these type of resisters may contain ruthenium.

Jim