Back to Ganoksin | FAQ | Contact

What metal is castable and can sit in pickle all day?


#1

Sounds like a joke but I have a weird job where I need to cast a few
decorative things that will be used in or near pickle solution (like
Sparex or Ciptic) every day for hours a day. So they need to not
react with or contaminate the pickle, plus it needs to be a fairly
cheap metal, cheaper than silver. Copper would work, but it’s lousy
to cast, silver would work, but it’s too costly for this job. What
castable metals can be exposed to a pickle solution daily without
contaminating it. won’t dissolve faster than copper or cause
reactions with jewelry that is soaking in the same hot pickle pot?
What do you think?

Mark


#2

Platinum, palladium, or 24kt gold will do nicely. Anything else will
be damaged by daily contact with acids. That’s why they are so
valued.

Have fun and make lots of jewelry.
Jo Haemer


#3

Stainless steel.

James Binnion


#4

The only decorative “things” I wear while making jewellery is the
bracelets and rings I wear. However I use dilute sulphuric acid as a
pickle so I’m not in a habit if putting my hands in the pickle bath.

If you don’t want something to contaminate the pickle then keep it
out of the pickle bath.

Cheers
Jen


#5

I assume you’re trying to cast a fixture to hold work pieces in the
pickle solution.

Does the fixture have to be made of metal? If not you could cast it
from plastic or resin. Then you could leave it in the pickle
indefinitely without worry of corrosion or contaminating the pickle.

Smooth-On http://www.ganoksin.com/gnkurl/1wr

makes a number of castable urethane plastics and epoxy resins that
are available in small “trial-size” quantities that would do the job
for you. You’ll find them on the left side of the home page, down
toward the bottom under “Products”.

Elizabeth Johnson


#6
Platinum, palladium, or 24kt gold will do nicely.That's why they
are so valued. 

Well that’s not true now days is it :frowning: When will the price of gold
come down?

Regards Charles A.


#7

titanium…


#8

don’t leave any metal in the pickle all day if you can avoid it- it
will etch the alloy ( if it is an alloy!) and weaken the metal in
the long run…pickle neutralise rinse well…if you’re using a trial
material, say for a casting- i.e.- plastics, waxes, plaster/wax
mixes ( sealing/setters wax) that’s still not a good habit to get
into…rer


#9

stainless steel and maybe tantalum- though tantalum isn’t used in
jewelry that i know of…anyway bad habit once its done remove it-
unless its citric acid pickle that is lesser a corrrosive than
sulfuric or sodium bisulfite ( pH down) based pickles…rer


#10
don't leave any metal in the pickle all day if you can avoid it-
it will etch the alloy 

There are two metals, at least, where this isn’t quite true.
Titanium will be completely unaffected by an acid pickle. And some of
the 300 series stainless steels are also safe for long term immersion
in pickle. I know that last one simply because way back when, in
school, the class pickle pot in the raising room was itself made of
stainless. Worked fine. For Titanium, I’ve used it for pickle
"hooks", as well as various fixtures in anodizing, which of course
is sometimes done in acid solutions. It’s also unaffected, especially
after anodizing. But just the natural surface oxide layer seems
sufficient.

The main problem with these is that they aren’t metals that the
average goldsmith is able to cast. Stainless, you can have cast for
you by many of the commercial casters able to cast platinum, but
Titanium requires some fairly fancy equipment, as it needs to be cast
in a vacuum or totally inert atmosphere. Some of the platinum casting
machines (here I’m talking about induction melting high speed
centrifuges like the Yasui or others) are capable of doing this, but
that doesn’t mean all the casters using them have actually set up the
added equipment to do it. …

Peter