초록

The present invention relates to a coating solution to be applied on the surface of metals or metal alloys, a process for cold forming of metals and metal alloys using said coating solution, and a coated blank made of a metal or a metal alloy.

대표청구항 ▼

I claim: 1. A coating solution to be applied on a surface of metals or metal alloys, comprising a polyphosphate, a dithiocarbamate, graphite and molybdenum disulfide. 2. The coating solution according to claim 1, wherein said polyphosphate is selected from the group consisting of ammonium polypho

I claim: 1. A coating solution to be applied on a surface of metals or metal alloys, comprising a polyphosphate, a dithiocarbamate, graphite and molybdenum disulfide. 2. The coating solution according to claim 1, wherein said polyphosphate is selected from the group consisting of ammonium polyphosphate, alkali metal polyphosphates, and a mixture thereof. 3. The coating solution according to claim 1, wherein the amount of said polyphosphate is in the range of from about 0.1% (w/v) to about 80% (w/v). 4. The coating solution according to claim 1, wherein said dithiocarbamate is a dialkyl dithiocarbamate. 5. The coating solution according to claim 4, wherein said dithiocarbamate is a heavy metal dithiocarbamate. 6. The coating solution according to claim 1, wherein the amount of said dithiocarbamate is in the range of from about 0.1% (w/v) to about 80% (w/v). 7. The coating solution according to claim 1, further comprising at least one component selected from the group consisting of alcohols, waxes, emulsifying agents, pH-modulating agents, polymeric compounds, oxides, friction-reducing agents, defoaming agents, carboxylic acids and derivatives thereof, organophosphorous compounds, phosphates, and mixtures thereof containing two or more of said components. 8. The coating solution according to claim 1, having a pH-value ranging from about 3 to about 4. 9. A process for cold forming of metals or metal alloys, comprising the steps of: (a) immersing a blank of a metal or a metal alloy in a bath comprising a coating solution comprising a polyphosphate, a dithiocarbamate, graphite and molybdenum disulfide, for a time period of from about 30 seconds to about 10 minutes; (b) drying said blank having the coating solution on its surface at a temperature ranging from about room temperature to about 80째 C.; and (c) subjecting the thus-coated blank to cold forming. 10. The process according to claim 9, wherein prior to step (a) the blank is sandblasted. 11. The process according to claim 9, wherein said polyphosphate is selected from the group consisting of ammonium polyphosphate, alkali metal polyphosphates, and a mixture thereof. 12. The process according to claim 9, wherein the amount of said polyphosphate is in the range of from about 0.1% (w/v) to about 80% (w/v). 13. The process according to claim 9, wherein said dithiocarbamate is a dialkyl dithiocarbamate. 14. The process according to claim 9, wherein said dithiocarbamate is a heavy metal dithiocarbamate. 15. The process according to claim 9, wherein the amount of said dithiocarbamate is in the range of from about 0.1% (w/v) to about 80% (w/v). 16. The process according to claim 9, wherein said coating solution further comprises at least one component selected from the group consisting of alcohols, waxes, emulsifying agents, pH-modulating agents, polymeric compounds, oxides, friction-reducing agents, defoaming agents, carboxylic acids and derivatives thereof, organophosphorous compounds, phosphates, and mixtures thereof containing two or more of said components. 17. The process according to claim 9, wherein said coating solution has a pH-value ranging from about 3 to about 4. 18. A blank comprising a coating obtainable by (a) immersing a blank of a metal or a metal alloy in a bath comprising a coating solution comprising a polyphosphate, a dithiocarbamate, graphite and molybdenum disulfide, for a time period of from about 30 seconds to about 10 minutes; and (b) drying said blank having the coating solution on its surface at a temperature ranging from about room temperature to about 80째 C., resulting in a coated blank. 19. The blank according to claim 18, wherein said polyphosphate is selected from the group consisting of ammonium polyphosphate, alkali metal polyphosphates, and a mixture thereof. 20. The blank according to claim 18, wherein the amount of said polyphosphate is in the range of from about 0.1% (w/v) to about 80% (w/v). 21. The blank according to claim 18, wherein said dithiocarbamate is a dialkyl dithiocarbamate. 22. The blank according to claim 18, wherein said dithiocarbamate is a heavy metal dithiocarbamate. 23. The blank according to claim 18, wherein the amount of said dithiocarbamate is in the range of from about 0.1% (w/v) to about 80% (w/v). 24. The blank according to claim 18, wherein said coating solution further comprises at least one component selected from the group consisting of alcohols, waxes, emulsifying agents, pH-modulating agents, polymeric compounds, oxides, friction-reducing agents, defoaming agents, carboxylic acids and derivatives thereof, organophosphorous compounds, phosphates, and mixtures thereof containing two or more of said components. 25. The blank according to claim 18, wherein said coating solution has a pH-value ranging from about 3 to about 4. 26. The coating solution according to claim 1, wherein the polyphosphate is present in an amount of 2 to 8% (w/v), the dithiocarbamate is present in an amount of 2 to 5% (w/v), the graphite is present in an amount of 5 to 12% (w/v), and the molybdenum disulfide is present in an amount of 5 to 12% (w/v). 27. The process according to claim 9, wherein the polyphosphate is present in an amount of 2 to 8% (w/v), the dithiocarbamate is present in an amount of 2 to 5% (w/v), the graphite is present in an amount of 5 to 12% (w/v), and the molybdenum disulfide is present in an amount of 5 to 12% (w/v). 28. The blank according to claim 18, wherein the polyphosphate is present in an amount of 2 to 8% (w/v), the dithiocarbamate is present in an amount of 2 to 5% (w/v), the graphite is present in an amount of 5 to 12% (w/v), and the molybdenum disulfide is present in an amount of 5 to 12% (w/v).