| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition capable of applying a water-soluble metal phosphate compound-based coating material a metal substrate without corroding the metal substrate, having excellent adhesivity, etc., even at a reduced curing temperature by making the composition include a water-soluble polyvalent metal phosphate, a polyvalent metal oxide and/or hydroxide in a specific ratio. SOLUTION: This composition comprises (A) a water-soluble polyvalent metal phosphate, (B) a polyvalent metal oxide and/or hydroxide, (C) boric acid and/or a borate and (D) a chelating agent capable of chelating the component B in the mixing ratio of the component A and the component B within a region of the equation (ΣMi+ΣNi)/ΣPi=1-2 when the sum of the product of the number of mols of metal atoms constituting the component A and their valence isΣMi, the sum of the number of mols of phosphorus atom isΣPi and the sum of the product of the number of mols of metal atoms constituting the component B and their valance isΣNi.
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