Corrosion-inhibiting pigments, their production and use
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United States of America Patent
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Jun 20, 1989
Grant Date -
N/A
app pub date -
Sep 30, 1987
filing date -
Feb 20, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to corrosion-inhibiting pigments containing metallic oxides, phosphates and/or molybdates, wherein the metals are zinc, aluminum, iron, barium, strontium, calcium, magnesium and titanium, singly or in combination, wherein the pigments also contain 0.03-2% by weight of soluble sodium dichromate or equivalent amounts of potassium dichromate, ammonium dichromate or equivalent amounts of respective chromates or chromic acid, singly or in their mixture. The invention also relates to a process for the manufacture of the pigments by thorough homogenization of the chromate components with the pigments, and to the use of the pigments in primers for ferrous and non-ferrous metallic substrates.
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