OBERFLÄCHENBEHANDELTES STAHLBLECH UND VERFAHREN ZU DESSEN HERSTELLUNG

摘要

The present application provides a coated steel sheet having a zinc phosphate coating containing Mg on a surface of a galvanized steel sheet, and having an orthophosphoric acid ester-containing coating, and the method for making the same. This coated steel sheet has no coating fall-off even during a chemical conversion treatment step of an automobile producing line and has excellent perforative corrosion resistance either with no-painting or after electrodeposition painting, chemical conversion treatability and press formability.