Question about gold plated pins

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mythen10

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I recently purchased 125 Siemens industrial PLC boards, the kind they use to run automation equipment. The boards that had Cpus on them had 386 and 486 processors so they have been around for a while.

All of the boards had at least 2 and some had 3 or 4 IDE type connectors on the boards (see photo 1). On normal type boards I would use a steel putty knife and and cut the connectors off of the board which would leave a clean pin I just had to pull from the holder. These boards that does not work on, I have been heating them on a hot plate and pulling the entire connector pins and all off of the board, I would then pull the pins ( photo 2) and then clip the pin off where the plating stops (photo 3).

As you can imagine it takes some time to do all of that and my fingers and thumb are wore out and I have several hundred connectors to do yet. My question is if I am going to process these in a sulfuric acid stripping cell to I really need to clip them off at the plating or can I just put the entire pin in and strip it that way ( photo 4) ?

Would the solder on the ends of the pins cause problems? This is new to me and I do not want to make my first attempt harder that it has to be. Any info would be appreciated....


Dave



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this are midgrade pins I love the pins you can get 4-5 grams of 24 k gold from 1kg of this pins but you must cut the unplated part
 

mythen10

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you must be patient drink some cola and start cut to get full plated part of them and after use nitric acid
 

mythen10

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I like the pins also but boy are they a lot of work and hard on the fingers... These have a deep yellow dull color so i think that is heavy plating, at least I hope so..
impossible to be heavy plated all Siemens electronics are poor in precious metal content , Siemens stuff probably is the worst ewaste you can find , the gold in pins are 4-5grams per kilo if you cut off the unplated part
 

mythen10

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I like the pins also but boy are they a lot of work and hard on the fingers... These have a deep yellow dull color so i think that is heavy plating, at least I hope so..
all Siemens boards are low grade boards , high grade boards you can find in HP devices
 

mythen10

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I like the pins also but boy are they a lot of work and hard on the fingers... These have a deep yellow dull color so i think that is heavy plating, at least I hope so..
every time when I find some Siemens stuff I start cry I hate Siemens
 

orvi

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me alway I cut every pins I love the pins
Quite a different opinion from my side - I have to say I do not prefer pins. Lots of waste from processing them :) Low gold content in comparison with overall metal content that need to be dissolved.
Relays, fingers, switches, CPUs, IC chips... These are my favourite types of material to process.
 
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