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Post by galadryl on Jun 6, 2014 13:28:48 GMT -6
I am making a 20 mm wide closed textured anti-clastic sterling silver cuff for a customer (don't we just love this kind of custom orders ). First annealed it, turned black (of course), my pickle could only cope with 50% of the oxidation, I scrubbed the rest off with steel wool (I don't do a lot of silver so maybe my pickle is no good with it). Anyway... Textured the strip with the rolling mill, then back to annealing before forming on a mandrel. It turned a dull red, but never oxidized, it looks like I am heating 999 silver, but it is not (not so soft, turned black first time, was marked 935 silver) But when it was annealed and cooled, it looked like a powdery white, I scrubbed that off with water and detergent and it was good as new. Does anybody have an explanation or idea? I don't mind not having oxidation, but somehow it is odd, or?
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Post by rocknwow on Jun 6, 2014 14:52:45 GMT -6
Ok...this is a curiosity thing. Got it.
No...what you experienced is common. What's odd is that you never experienced it before or that you could get the powdery off with just soap...I use a brass brush...who knew...maybe mine will come off with detergent too?
I'd avoid steel wool too, I'd use it as only a last resort, I was taught to use brass wire brushes, that way it doesn't contaminate the pickle.
Why it happened? I know it's been explained to me...I hope I get this right. The first time you got an oxidized layer of copper to come to the surface and took it off with the steel wool. The second time the layer of copper was clean not oxidized. If you've ever done granulation this is the step to do that.
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Post by galadryl on Jun 7, 2014 2:20:22 GMT -6
Ah, that is cool. Thank you for your explanation. Sounds logic. I did use a brass brush with the detergent (no break through here )forgot to mention it, but I still could not get it off, so I used steel wool as plan b. No, I have never done granulation, still on my long to-try-out list. Not even sure what it is exactly, something with small balls (don't laugh now).
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Post by lotty64 on Jun 9, 2014 3:59:06 GMT -6
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Post by galadryl on Jun 9, 2014 5:42:13 GMT -6
But Caroline, soldering is so much fun (when it works out ) Kevin, I just realized I had never heated up silver for a second time, that is probably why I never have encountered that "not oxidizing"
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Post by Irith-Rita on Sept 6, 2014 11:53:58 GMT -6
I am not sure, but before soldering I cover the whole piece with Borax solution. I is said to prevent fire stains. Also - perhaps your flame was too concentrated?
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Post by galadryl on Sept 9, 2014 10:08:47 GMT -6
Yes, I heard too that it prevents fire scale, and luckily I had never to "face" it. I normally just use borax / flux when I solder but I will try and cover the entire piece next time when I "only" have to heat up silver. Thx, Irith
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Post by lotty64 on Sept 10, 2014 4:24:07 GMT -6
But Caroline, soldering is so much fun (when it works out ) The funny thing is I use to do soldering for a living, all under a microscope too. Perhaps that is why I like tiny little beads so much !
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Post by koolbraider on Sept 10, 2014 11:14:21 GMT -6
Don't have a clue about your question but had to comment on lotty64's much larger avatar. Love it, lipstick and all.
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Post by lotty64 on Sept 10, 2014 12:06:30 GMT -6
Don't have a clue about your question but had to comment on lotty64's much larger avatar. Love it, lipstick and all. A girls gotta do what a girls gotta do.
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Post by Deleted on Aug 12, 2015 1:13:50 GMT -6
Theoretically, oxidation requires oxygen, and in thr rare event you heated the piece so perfectly thar while the flame was brushing it you covered the item so well all the air which could reach the surface was consumed by the flame, you would avoid oxidation. And the white you saw was the fine silver rushing to the surface, leaving heavier elements that form the other .065 (your silver was Marked 935, that's Argentum, and that is common with that alloy)
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