How do you clean bronze slag from inside crucible?

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larryary (author) 8 months ago

thanks fellas. i will try both next time. i partly soved my problem yesterday when i tapped 2 cruicibles so hard they broke. i have trouble getting ingots and tried mig wire which oxidises. tig rods are better.

Cruicibles can be very fragile more so when they are hot.

Why do you need ingots, raw metal is usually sufficient - and what are you after?

larryary (author)  Downunder35m8 months ago
Silicon bronze because it remelts without loss of elements and it is traditional. It can also be tigged with rods that do not show colour variation at the join.

When I worked in a foundry we kept the bronze crucible clean by melting glass with the bronze stock.

So I would melt bronze stock and a little glass until it covers the slag and heat it to 2500.

Then scrape out the slag coated glass.


larryary (author)  Josehf Murchison8 months ago

thanks..i posted a comment

Downunder35m8 months ago

I am not sure if it works for bronze but I sometimes use a mix of borax and sodium chloride.
I creeps under must alloys or makes it possible to get rid of a lot of the oxides.
Once cooled I dissolve the remains in water and most if not all of the slack can be scraped out.

larryary (author)  Downunder35m8 months ago

thanks.. i posted another comment....where do you get your ingots in aus?

No clue as melt the stuff down myself if I need it.
Ususually I either visit the local scrap yard or take what I find useful from the roadside.