By contacting an aqueous treatment solution for producing a chemical conversion film on a zinc surface or a zinc alloy surface, a concentrate for preparing the aqueous treatment solution, a kit containing the concentrate, and the aqueous treatment solution Method for producing conversion film on workpiece having zinc coating or zinc alloy film

摘要

An aqueous treatment solution for producing conversion coatings on metal surfaces, in particular on zinc or zinc alloy surfaces, contains: Cr(III) ions in an amount of 0.1 g/l to 8.0 g/l; zirconium and/or titanium ions in an amount of 0.1 g/l to 15 g/l; organosilane-modified silicon oxide nanoparticles in an amount of 0.1 g/l to 50 g/l; and fluoride ions in an amount of 0.1 g/l to 15 g/l.