| abstract |
PROBLEM TO BE SOLVED: To form a film excellent in corrosion resistance (particularly corrosion resistance of a processed part), alkali resistance, heat resistance, abrasion resistance, and adhesion (adhesion with a top coat film, adhesion to a substrate). The present invention provides a metal surface treatment composition having excellent storage stability. A silica sol binder (a) containing a silane coupling agent (a-1) and an alkoxysilane oligomer (a-2), a phosphate ion (b), a fluoride ion (c), and V, Ti. , Zr, Zn, Mn, Mg, Al, Co, Ni, Mo, W, and a metal surface treatment composition containing a metal compound (d) containing at least one metal selected from the group consisting of Ce and Ce. [Selection figure] None |