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

The purpose of the present invention is to provided: a surface treatment agent composition for non-chromium steel sheets whereby it is possible to remove 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 such a composition. Another purpose of the present invention is to provide a surface-treated steel sheet exhibiting higher corrosion resistance than prior art, a surface-treated steel sheet with an organic coating, and a can lid, can body and seamless can using the aforementioned 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 means of cathodic electrolysis.