Descaling/deglassing salt composition and method
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United States of America Patent
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Jun 22, 1993
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app pub date -
Aug 16, 1991
filing date -
Aug 16, 1991
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Abstract
An improved salt and method for descaling and deglassing metals, especially metal forgings and even more specifically, titanium forgings wherein glass has been utilized as a forging lubricant, is provided. A composition of the salt has at least one alkali metal hydroxide, at least one alkali metal nitrate and at least one alkali metal or alkaline earth metal fluoride. Preferably, the salt includes from about 60-75% sodium hydroxide, from about 15-25% potassium hydroxide, from about 3-6% sodium fluoride, and from about 5-10% sodium nitrate. The specific preferred composition is one which contains about 67.5% sodium hydroxide, about 18% potassium hydroxide, about 4.5% sodium fluoride and about 10% sodium nitrate.
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