Post B5jHyBgF9JYeL8g79c by azonenberg@ioc.exchange
 (DIR) More posts by azonenberg@ioc.exchange
 (DIR) Post #B5i4FP8GnM7IT28viq by azonenberg@ioc.exchange
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       Testing the silver chloride based plating powder on some PCB samples that I milled.It plates bare copper as well as, interestingly, ENIG coated surfaces but doesn't seem to deposit on non-metals.I milled a cavity into layer 2 on this scrap board (ignore the solder paste granules this board has been used for stencil testing too and I didn't bother fully cleaning lol.I used a combination of a lint-free swab and wooden toothpick to rub the plating composition over the surface. Plating quality deep in the cavity near the edges was defintiely sub-par, you can see the middle area is brighter looking compared to the edges because I was able to rub it more completely. But if I was trying to do rework or wire bonding to this it would probably be good.Gonna take it into work tomorrow and test if it is in fact wire bondable (and how well it stands up to oxidation etc when heated)
       
 (DIR) Post #B5iGHhwR274IpdTKng by magnetic_tape@infosec.exchange
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       @azonenbergThese look like mid-20th century asbtract paintings (congratulations I guess!)
       
 (DIR) Post #B5jGxAhvBIQf4wPmqG by ftg@mastodon.radio
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       @azonenberg Silver chloride you say? What kind of process?Or just along the lines of making a saturated solution of it in water and dipping the pcb in it?
       
 (DIR) Post #B5jHBinnDN4usM6DDs by azonenberg@ioc.exchange
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       @ftg silver chloride plus sodium chloride and potassium bitartrate.I think (don't fully understand the theory of operation) the NaCl improves the extremely poor solubility of silver chloride slightly while the tartrate is ... Doing something to improve deposition and ensure a shiny smooth deposition (apparently after deposition you're supposed to wipe it down with just aqueous potassium bitartrate which somehow cleans the surface)
       
 (DIR) Post #B5jHRfAeU2PqFMOQ1Q by ftg@mastodon.radio
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       @azonenberg The tartarate might form some complexes with other stuff, scavenging it and preventing it from dropping out of solution.But outside of silver chloride that sounds like stuff I can get at the supermarket or health food store.Thanks for bringing this to my attention.All silver plating of PCB's that don't use cyanides is a treat to come across.
       
 (DIR) Post #B5jHvU9W0v9MlH57SK by azonenberg@ioc.exchange
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       @ftg silver nitrate is easily converted to chloride by mixing a solution with aqueous sodium chloride.the big thing is, it's not an immersion plating chemistry. It has to be kinda scrubbed onto the surface, the rubbing is important to overcome the extremely low solubility of the chloride
       
 (DIR) Post #B5jHyBgF9JYeL8g79c by azonenberg@ioc.exchange
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       @ftg i can link you the full recipe when i get home it's from the Canadian government of all places
       
 (DIR) Post #B5jLKQy3IAIFzBJ8uO by ftg@mastodon.radio
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       @azonenbergYes please!