Anti corrosive pigments based on alkaline earth hydrogen phosphates
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United States of America Patent
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Jun 30, 1992
Issued Date -
N/A
app pub date -
Jul 23, 1991
filing date -
Sep 21, 1987
priority date (Note) -
Expired
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Abstract
The invention shows anticorrosive pigments on the basis of alkaline earth hydrogen phosphates, which are distinguished in that they contain from 20 mole-% to 60 mole-% of alkaline earth carbonate, the balance being alkaline earth hydrogen phosphate of the particular like alkaline earth metal, as well as a process of producing them in that alkaline earth carbonate and phosphoric acid are in per se known manner reacted with one another at the desired molar ratio, as well as the use of the anticorrosive pigments for corrosion protection of aluminum substrates, particularly for preventing filiform corrosion in aircraft coatings.
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