Anti-corrosive paint
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United States of America Patent
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-
Mar 19, 1985
Grant Date -
N/A
app pub date -
May 31, 1983
filing date -
Nov 10, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An anti-corrosive coating composition includes an anti-corrosive pigment component comprising (a) a salt comprising a polyvalent metal cation and an organic polyphosphonic acid containing at least 2 phosphonic acid groups and (b) a corrosion passivator capable of modifying the metal oxide film on the metal to be protected to render it more protective. The ratio of the polyphosphonate salt (a) to the passivator (b) in the coating composition is 1:1 to 50:1 by weight.
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