copper gone black while soaking in citric

Perforated & bubble cap plated columns

copper gone black while soaking in citric

Postby invisigoth » Thu Feb 07, 2019 9:55 am

hi all :)
I was starting to make some t's and came across something strange. I had soaked the first piece in citric after silver brazing the site glass side arm, which cleaned every thing up nicely. After soldering the flanges, I first soaked the piece in vinager to remove the flux (seems to work better than citric for flux removal), and things started to go black around the flanges. when I soaked in citric (20%) the whole things started to darken up. it almost looked like it was starting to take on a silver coat. any ideas? never happend before :wtf:
invisigoth
 
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Re: copper gone black while soaking in citric

Postby scythe » Fri Feb 08, 2019 1:57 pm

Same happened to me to some of my caps i was making.
Its to do with a contaminated bath.
Change the water, give you copper a wipe over with a green scourer and have another go.

Or try salt and vinegar, that came up recently as a strong cleaner.
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Re: copper gone black while soaking in citric

Postby Ravvin » Sat Feb 09, 2019 12:49 pm

Woolies are now selling a double-strength white vinegar for not much more than the homebrand regular stuff, although that's the introductory marked down price. I'll get a bottle or 2 while its on special and see if it works any better than the regular stuff.
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