Steel sheet coated with chemical conversion film and process for producing the same

摘要

The present invention provides a process for producing a steel sheet coated with a chemical conversion film, comprising: coating either one side or both sides of a steel sheet with a treating liquid comprising silica particles and an acid ingredient; and drying the applied treating liquid by heating to thereby form a coating film comprising a reaction product of the silica, the acid ingredient and one or more metals in the steel sheet.