Process for the removal of alkali metal nitrite from nitrate containing salt baths
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United States of America Patent
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Jan 5, 1988
Grant Date -
N/A
app pub date -
Aug 5, 1986
filing date -
Sep 24, 1985
priority date (Note) -
Expired
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Abstract
Undesired nitrites are formed during the treatment of salt bath nitrided structural components of iron and steel in nitrate containing cooling baths, and they must be removed from the washing water. The build-up of nitrites can be avoided by oxidizing the nitrite in the salt bath into nitrate by passing air into the cooling bath during off-times.
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