Inhibitor of the corrosion of a metal material such as steel
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United States of America Patent
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Oct 22, 1996
Grant Date -
N/A
app pub date -
Nov 22, 1994
filing date -
Dec 14, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a corrosion inhibitor for a metal material such as steel, of the type consisting of an aqueous solution containing an alkali metal nitrite, wherein said solution contains 0.01 to 0.3 mol/l of an alkali metal nitrite, 0.01 to 0.3 mol/l of an alkali metal phosphate, and phosphoric acid in a proportion of a quantity sufficient to maintain the pH of said solution, measured at ambient temperature, between 6.9 and 7.2.
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