Method of producing surface-treated metal material and method of producing coated metal item
View Patent ↗A method of producing a surface-treated metal material, comprising: surface treating a metal material using a treatment liquid (1), which comprises from 10 to 10,000 ppm of tin ions and has a pH of 1.0 or greater, and subjecting the metal material that has undergone surface treatment with the treatment liquid (1) to an additional chemical conversion treatment using a treatment liquid (2), which comprises zirconium ions and/or titanium ions.
1. A method of producing a surface-treated metal material, comprising:
surface treating a metal material using a treatment liquid (1), which comprises from 10 to 10,000 ppm of tin ions and has a pH of 1.0 or greater, to form a first layer; and
subjecting the metal material that has undergone surface treatment with the treatment liquid (1) to an additional chemical conversion treatment using a treatment liquid (2), which comprises tin ions and further comprises zirconium ions and/or titanium ions,
wherein the chemical conversion treatment using treatment liquid (2) forms a uniform metal oxide film.
2. The method of producing a surface-treated metal material according to claim 1 , wherein the pH of the treatment liquid (1) is within a range from 1.0 to 5.5.
3. The method of producing a surface-treated metal material according to claim 1 , wherein the treatment liquid (1) further comprises at least one of a surfactant and a rustproofing agent.
4. The method of producing a surface-treated metal material according to claim 1 , wherein the treatment liquid (2) further comprises a polyamine compound.
5. The method of producing a surface-treated metal material according to claim 4 , wherein the polyamine compound incorporated within the treatment liquid (2) is an organosiloxane obtained by subjecting an amino group-containing silane to a polycondensation.
6. The method according to claim 1 , wherein the additional chemical conversion treatment comprises electrolytic treatment using the metal material as a cathode.
7. The method according to claim 1 , wherein the treatment liquid (2) further comprises aluminum ions and/or indium ions.
8. The method according to claim 1 , wherein the elemental ratio between zirconium and/or titanium and tin within the obtained metal oxide film is within a range from 1/10 to 10/1.
9. A method of producing a coated metal item, comprising:
surface treating a metal material using a treatment liquid (1), which comprises from 10 to 10,000 ppm of tin ions and has a pH of 1.0 or greater, to form a first layer;
subjecting the metal material that has undergone surface treatment with the treatment liquid (1) to an additional chemical conversion treatment using a treatment liquid (2), which comprises tin ions and further comprises zirconium ions and/or titanium ions, to form a metal oxide film of uniform thickness; and
forming on the metal material that has undergone chemical conversion treatment with the treatment liquid (2) a coating film by cationic electrodeposition coating.
10. The method of producing a coated metal item according to claim 9 , wherein the treatment liquid (2) further comprises a polyamine compound.
11. A method of producing a surface-treated metal material, comprising:
surface treating a metal material using a treatment liquid (1), which comprises from 10 to 10,000 ppm of tin ions and has a pH of 1.0 or greater; and
subjecting the metal material that has undergone surface treatment with the treatment liquid (1) to an additional chemical conversion treatment using a treatment liquid (2), which comprises tin ions and further comprises from 10 to 10,000 ppm of zirconium ions and/or titanium ions to form a uniform metal oxide layer, and
wherein a ratio of the tin ion concentration within the treatment liquid (1) relative to the concentration of the zirconium and/or titanium ions within the treatment liquid (2) is within a range of from 0.005 to 1.
12. A method of producing a coated metal item, comprising:
surface treating a metal material using a treatment liquid (1), which comprises from 10 to 10,000 ppm of tin ions and has a pH of 1.0 or greater;
subjecting the metal material that has undergone surface treatment with the treatment liquid (1) to an electrolytic treatment using:
a treatment liquid (2), which comprises tin ions and further comprises zirconium ions and/or titanium ions, and
the metal material as a cathode; and
forming on the metal material that has undergone chemical conversion treatment with the treatment liquid (2) a coating film by cationic electrodeposition coating.