Upsilon
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Phosphoric acid glass treatment?
I happened to stumble upon this abstract:
http://www.sciencedirect.com/science/article/pii/00223093709...
I was aware that extremely hot molten phosphoric acid attacks glass, but the article also mentions that this process creates a protective layer of
silicon phosphate, which reduces the mechanical strength of the glass, but apparently offers protection against glass-etching fluoride ions. Can
anyone confirm this? It seems very interesting.
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BromicAcid
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Just let me take a second to connect the two topics...
http://www.sciencemadness.org/talk/viewthread.php?tid=62676
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Upsilon
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Huh, I could have sworn I didn't find any other topics. Oops.
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j_sum1
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I have heard this before on these boards.
If I recall, the consensus was that the weakening was significant, the protective layer was of indeterminant value and that with fluorine you just
don't take any chances.
Do a search and see what you find. A mod might even merge threads for you.
[edit]
Beaten by two posts.
That was fast.
[Edited on 1-10-2015 by j_sum1]
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Upsilon
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Well, while on the topic, does this mean that phosphoric acid is a feasible candidate for dissolving very unreactive metal oxides, such as TiO2? Since
it is clearly capable of dissolving SiO2.
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