Non-toxic corrosion protection pigments based on cobalt

Details Non-toxic corrosion protection pigments based on cobalt Non-toxic corrosion protection pigments based on cobalt

C - Chemistry, Metallurgy

09

D

C09D 5/08 (2006.01) C09C 1/62 (2006.01) C09C 1/64 (2006.01) C23F 11/18 (2006.01)

Patent

CA 2472069

Corrosion-inhibiting pigments based on cobalt are described that contain a trivalent or tetravalent cobalt/valence stabilizer complex. An inorganic or organic material is used to stabilize the trivalent or tetravalent cobalt ion to form a compound that is sparingly soluble in water. Specific stabilizers are chosen to control the release rate of trivalent or tetravalent cobalt during exposure to water and to tailor the compatibility of the powder when used as a pigment in a chosen binder system. Stabilizers may also modify the processing and handling characteristics of the formed powders. Cobalt/valence stabilizer combinations are chosen based on the well-founded principles of cobalt coordination chemistry. Many cobalt-valence stabilizer combinations are presented that can equal the performance of conventional hexavalent chromium systems.

L'invention concerne des pigments anticorrosion à base de cobalt, qui contiennent un complexe stabilisateur de valence/cobalt trivalent ou tétravalent. Un matériau inorganique ou organique est utilisé pour stabiliser l'ion cobalt trivalent ou tétravalent et former un composé modérément soluble dans l'eau. Des stabilisateurs spécifiques permettent de réguler le degré de libération du cobalt trivalent ou tétravalent durant l'exposition à l'eau et d'adapter la compatibilité de la poudre lorsqu'il s'agit de pigment utilisé dans un système liant donné. Les stabilisateurs peuvent également modifier les caractéristiques de traitement et de manipulation des poudres constituées. Les combinaisons stabilisatrices de cobalt/valence sont déterminées en fonction des principes bien établis de la chimie des combinaisons du cobalt. Aux fins de l'invention, on présente de nombreuses combinaisons stabilisatrices de cobalt/valence capables d'égaler les performances des systèmes classiques au chrome hexavalent.

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