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In Reply to: RE: Etched Code posted by Mechans on August 09, 2016 at 21:30:22
Steve,
Just a guess, but I suspect hydrofluoric acid is uesd. Can be very nasty stuff.
Follow Ups:
Correct, H 2 F 2 is used to etch glass. The SiO 2 in glass is converted into volatile SiF 4 .
While technically weak, which means the amount of solvated protons produced when dissolved in H 2 O is low, H 2 F 2 is highly corrosive and must treated with great respect. Rubber, plastic, wax, and lead are what's used to contain the nasty stuff.
Eli D.
Another way to deal with something that etches or corrodes everything is to wait until you need it and make it then.
Also calcium is what is used to neutralize it so it is literally "bad to the bone"
mt
nada aqui
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nada aqui
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Buy Chinese. Bury freedom.
Wax or lead. When hard rubber came along, it was also suitable.
It is possible to generate hydrofluoric acid "in situ" by using sodium fluoride and sulfuric acid. That mix etches glass "like gangbusters".
The etching occurs as silicon dioxide is converted to volatile silicon tetrafluoride and water. The silicon tetrafluoride vaporizes (a product is removed) and, per Le Châtelier's principle, the reaction is driven to "completion".
If lots of the acid is present, all of the glass will be consumed. Lots of glass and little acid yields the results we see.
Eli D.
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