Process and solution for providing a conversion coating on a metal surface
AssigneeCommonwealth Scientific and Industrial Research Organisation
InventorsAnthony Ewart Hughes, Terence William Turney, Karen Joy Hammon Nelson
Life of this patent
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Abstract
A process and an aqueous, acidic solution for forming a rare earth element containing coating on the surface of a metal, said solution including effective quantities of: (a) one or more rare earth element containing species including at least one rare earth element capable of having more than one higher valence state, as herein defined; and (b) one or more additives selected from the groups including: i) aqueous metal complexes including at least one peroxo ligand; and ii) metal salts or aqueous metal complexes of a conjugate base of an acid in which the metals are selected from Transition Elements and Group IVA elements of the Periodic Table as herein defined.
Claims59
An aqueous, acidic solution for forming a rare earth element containing conversion coating on the surface of a metal when said surface of a metal is contacted with said solution, said solution being chromium free and consisting essentially of effective quantities, sufficient to form said rare earth containing coating, of:
- (a) one or more rare earth element-containing species including at least one rare earth element capable of having more than one higher valence state;
- and
- (b) one or more additives selected from the groups consisting of:
- (i) aqueous metal complexes including at least one peroxo ligand, wherein said metals are selected from Groups IVB, VB, VIB and VIIB of the Periodic Table;
- and
- (ii) metal salts of a conjugate base of an acid or aqueous metal complexes of a conjugate base of an acid in which the metals are selected from Transition Elements consisting of silver, manganese, copper, zinc, ruthenium and iron, and Group IVA elements of the Periodic Table.
An aqueous, acidic solution for forming a rare earth element containing coating on the surface of a metal, said solution being chromium free and including effective quantities, sufficient to form said rare earth containing coating, of:
- (a) one or more rare earth element-containing species including at least one rare earth element capable of having more than one higher valence state;
- and
- (b) one or more additives selected from the groups consisting of:
- (i) aqueous metal complexes including at least one peroxo ligand;
- and
- (ii) metal salts of a conjugate base of an acid or aqueous metal complexes of a conjugate base of an acid in which the metal is tin.
An aqueous, acidic solution for forming a rare earth element containing coating on the surface of a metal, said solution being chromium free and including effective quantities, sufficient to form said rare earth containing coating, of:
- (a) one or more rare earth element containing species including at least one rare earth element capable of having more than one higher valence state, and
- (b) at least one aqueous metal complex including at least one peroxo ligand.
An aqueous, acidic solution for forming a rare earth element containing coating on the surface of a metal, said solution being chromium free and including effective quantities, sufficient to form said rare earth containing coating, of:
- one or more rare earth element-containing species including at least one rare earth element capable of having more than one higher valence state;
- at least one aqueous metal complex including at least one peroxo ligand;
- and
- at least one metal salt of a conjugate base of an acid or aqueous metal complex of a conjugate base of an acid in which the metals are selected from Transition Elements, other than chromium, and Group IVA elements of the Periodic Table.
A process for forming a coating on the surface of a metal, comprising the step of contacting the metal surface with an aqueous, acidic solution for forming a rare earth element containing conversion coating on the surface of a metal, said solution being chromium free and consisting essentially of effective quantities, sufficient to form said rare earth containing coating, of:
- (a) one or more rare earth element containing species including at least one rare earth element capable of having more than one higher valence state;
- and
- (b) one or more additives selected from the groups consisting of:
- (i) aqueous metal complexes including at least one peroxo ligand, wherein said metals are selected from Groups IVB, VB, VIB and VIIB of the Periodic Table;
- and
- (ii) metal salts of a conjugate base of an acid or aqueous metal complexes of a conjugate base of an acid in which the metals are selected from Transition Elements consisting of silver, manganese, copper, zinc, ruthenium and iron, and Group IVA elements of the Periodic Table.
A process for forming a coating on the surface of a metal, comprising the step of contacting the metal surface with an aqueous, acidic solution being chromium free and including effective quantities, sufficient to form said rare earth containing coating, of:
- (a) one or more rare earth element containing species including at least one rare earth element capable of having more than one higher valence state;
- and
- (b) one or more additives selected from the groups consisting of:
- (i) aqueous metal complexes including at least one peroxo ligand;
- and
- (ii) metal salts of a conjugate base of an acid or aqueous metal complexes of a conjugate base of an acid in which the metal is tin.
A process for forming a coating on the surface of a metal, comprising the step of contacting the metal surface with an aqueous, acidic solution being chromium free and including effective quantities, sufficient to form said rare earth containing coating of:
- (a) one or more rare earth element containing species including at least one rare earth element capable of having more than one higher valence state;
- and
- (b) at least one aqueous metal complex including at least one peroxo ligand.
A process for forming a coating on the surface of a metal, comprising the step of contacting the metal surface with an aqueous, acidic solution being chromium free and including effective quantities, sufficient to form said rare earth containing coating, of:
- one or more rare earth element-containing species including at least one rare earth element capable of having more than one higher valence state;
- at least one aqueous metal complex including at least one peroxo ligand;
- and
- at least one metal salt of a conjugate base of an acid or aqueous metal complex of a conjugate base of an acid in which the metals are selected from Transition Elements, other than chromium, and Group IVA elements of the Periodic Table.
An aqueous, acidic solution for forming a rare earth element containing conversion coating on the surface of a metal, said solution being chromium free and including effective quantities, sufficient to form said rare earth containing coating, of:
- (a) one or more rare earth element-containing species including at least one rare earth element capable of having more than one higher valence state;
- and
- (b) one or more additives selected from the groups consisting of:
- (i) aqueous metal complexes including at least one peroxo ligand, wherein said metals are selected from Groups IVB, VB, VIB and VIIB of the Periodic Table;
- and
- (ii) metal salts of a conjugate base of an acid or aqueous metal complexes of a conjugate base of an acid in which the metal is zinc.
An aqueous, acidic solution for forming a rare earth element containing conversion coating on the surface of a metal, said solution being chromium free and including effective quantities, sufficient to form said rare earth containing coating, of:
- (a) one or more rare earth element-containing species including at least one rare earth element capable of having more than one higher valence state;
- and
- (b) one or more additives selected from the group consisting of:
- (i) aqueous metal complexes including at least one peroxo ligand, wherein said metals are selected from Groups IVB, VB, VIB and VIIB of the Periodic Table;
- and
- (ii) metal salts of a conjugate base of an acid or aqueous metal complexes of a conjugate base of an acid in which the metal is manganese.
An aqueous, acidic solution for forming a rare earth element containing conversion coating on the surface of a metal, said solution being chromium free and including effective quantities, sufficient to form said rare earth containing coating, of:
- (a) one or more rare earth element-containing species including at least one rare earth element capable of having more than one higher valence state;
- and
- (b) one or more additives selected from the group consisting of:
- (i) aqueous metal complexes including at least one peroxo ligand, wherein said metals are selected from Groups IVB, VB, VIB and VIIB of the Periodic Table;
- and
- (ii) metal salts of a conjugate base of an acid or aqueous metal complexes of a conjugate base of an acid in which the metal is copper.
Dependencies are inferred from the claim text.