SURFACE TREATMENT AGENT COMPOSITION, METHOD FOR PRODUCING SURFACE-TREATED STEEL SHEET, SURFACE-TREATED STEEL-SHEET, SURFACE-TREATED STEEL SHEET WITH ORGANIC COATING, CAN LID, CAN BODY, AND SEAMLESS CAN

摘要

A surface treatment agent composition for non-chromium steel sheets for removing iron ions without reducing the amount of aluminum ions when subjecting the steel sheet to surface treatment by means of cathodic electrolysis using a surface treatment agent containing aluminum ions as the main component; and a method for producing a surface-treated steel sheet using the composition. A surface-treated steel sheet exhibiting high corrosion resistance, a surface-treated steel sheet with an organic coating, and a can lid, can body and seamless can produced using the surface-treated steel sheets. A surface treatment agent composition for steel sheets contains aluminum ions, fluorine ions and polycarboxylic acid and is used as the surface treatment bath used for forming a surface treatment coating film on the surface of the steel sheet by cathodic electrolysis.