SURFACE-TREATED STEEL SHEET WITHSUPERIOR SUITABILITY TO CHEMICAL CONVERSION TREATMENT

摘要

PURPOSE:To obtain the titled steel sheet having favorable properties by which the formation of nuclei of crystals of a film and the growth of the crystals are not hindered during chemical conversion treatment, that is, superior suitability to chemical conversion treatment by depositing a prescribed amount of an Ni-P alloy contg. a prescribed amount of P on the surface of a rolled steel sheet. CONSTITUTION:At least one side of a rolled steel sheet is plated with 1-100mg/ m<2> Ni-P alloy contg. 0.01-5% P by electroplating, chemical plating, vacuum deposition or other method. The resulting plated steel sheet has superior suitability to chemical conversion treatment.