METAL SURFACE MODIFYING LIQUID AND METHOD FOR METAL SURFACE MODIFICATION

摘要

Provided is a fluorine-free metal surface modifying liquid which is characterized by being an aqueous liquid having a pH of 2.0 to 6.5, and comprising 10 to 500 ppm of at least one element selected from Zr and Ti, 20 to 3000 ppm of oxycarboxylic acid, 1 to 10000 ppm of alkanoic acid having 1 to 7 carbon atoms and 1 to 10000 ppm of nitric acid ion, where the molar ratio of the at least one element selected from Zr and Ti to the oxycarboxylic acid is 1/10 to 1/2 in terms of former/latter ratio.