Patent ID: 8287662

Claim:
A metal surface treatment composition used for surface treatment of a metal, containing at least one selected from the group consisting a zirconium compound and titanium compound, and a polyamine compound having a number average molecular weight from 150 to 500,000, wherein said polyamine compound contains from 0.1 mmol to 17 mmol of at least one selected from the group consisting primary and secondary amino group per 1 g of solid content, a content of at least one selected from the group consisting said zirconium compound and titanium compound in said metal surface treatment composition is from 10 ppm to 10,000 ppm with respect to the metal element, a mass ratio of at least one selected from the group consisting zirconium element and titanium element included in at least one selected from the group consisting said zirconium compound and titanium compound is from 0.1 to 100, with respect to said polyamine compound, and said polyamine compound is a compound having at least one constituent unit shown by the following Formula (3): wherein R 1 is an alkylene group having a carbon number of 1 to 6, R 2 is a substituent shown b the following Formulas (4) to (6), R 3 is â€”OH, â€”OR 4 or â€”R 5 (R 4 and R 5 are alkyl groups having a carbon number of 1 to 6) wherein R 6 is a hydrogen atom, aminoalkyl group having a carbon number of 1 to 6, or an alkyl group having a carbon number of 1 to 6 R 7 is a hydrogen atom, or an aminoalkyl group having a carbon number of 1 to 6.