| 摘要 |
PURPOSE:To provide an Fe-P plated steel sheet having excellent phosphate chemical convertibility by plating a specific amt. of an Fe-P layer contg. a limited amt. of P on at least one surface of a blank material and sticking further N, Zn, Mn, Ti, etc. on the layer. CONSTITUTION:An Fe-P plating layer contg. 0.0003-0.5wt% P is formed at >=0.01g/m<2> on at least one surface of a steel sheet and any among Ni, Zn, Mn and Ti is stuck at 5-50mg/m<2> on said plating layer, thereby producing an Fe-P plated steel sheet. A Zn or Zn alloy plating layer is formed as the inside layer of the Fe-P plating layer according to need. Since a small amt. of P is incorporated in the plating layer, the plated steel sheet has excellent phosphate chemical convertibility and cation electrodeposition paintability. The steel sheet has further excellent bare corrosion resistance in the state after the chemical conversion treatment. |
