Claims
- 1. A corrosion preventive coating composition comprising:
- (1) a corrosion preventive pigment which has a pH value of from 5 to 9, consisting essentially of
- (a) a phosphorus compound which generates phosphate ions in the presence of water selected from the group consisting of phosphorous pentoxide, ortho-phosphoric acid, a condensed phosphoric acid, an alkaline metal, alkaline earth metal or transition metal phosphate, or an alkaline metal, alkaline earth metal or transition metal condensed phosphate, and
- (b) a vanadium compound which generates vanadate ions in the presence of water and oxygen, selected from the group consisting of vanadium (V) oxide, a vanadyl compound, an alkaline metal, an alkaline earth metal or transition metal vanadate, a calcined condensate of alkaline metal, alkaline earth metal or transition metal vanadates, or a heterocondensate of alkaline metal, alkaline earth metal or transition metal vanadates, and
- (2) a film forming resin selected from the group consisting of maleic acid modified oils, epoxy resins, modified epoxy resins, alkyd resins, acryl resins, melamine resins, urea resins, blocked isocyanate resins, maleic acid modified polybutadiene resins, polyvinyl butylal, polyvinylalcohol, silicate esters, silicone resins, silicates and chlorinated rubber; said pigment being present in an amount of 0.1 to 50 parts by weight based on 100 parts by weight of a solid content of said coating composition,
- said phosphorus and vanadium compound being present in amounts such that the molar ratio of the phosphorus to the vanadium compound in terms of P.sub.2 O.sub.5 and V.sub.2 O.sub.5, respectively, is 0.3 to 100 and wherein said pigment has an electric conductivity of 100 to 3,000 .mu.S/cm.
- 2. The composition according to claim 1 wherein said corrosion preventive pigment is prepared by calcining a mixture of said phosphorus compound, a vanadium compound, optionally a network modifier and a glassy material and then grinding.
- 3. The composition according to claim 1 wherein the corrosion preventive pigment is a physical non-calcined mixture of said phosphorus compound and said vanadium compound.
- 4. The composition according to claim 1 being an aqueous coating composition, an anionic electrocoating composition or a zinc rich coating composition.
- 5. The composition according to claim 1 wherein the molar ratio of the phosphorus compound to the vanadium compound in terms of P.sub.2 O.sub.5 /V.sub.2 O.sub.5 is 1 to 10.
Parent Case Info
This is a continuation in part of now abandoned application, Ser. No. 07/090,966, filed Aug. 31, 1987.
US Referenced Citations (12)
Continuations (1)
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Number |
Date |
Country |
Parent |
90966 |
Aug 1987 |
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