| 摘要 |
PURPOSE:To provide high corrosion resistance to an Ni plates steel sheet for a vessel by successively forming an Ni layer by plating, an Ni, Sn or Zn layer by electroless plating and a chromate coating layer on the surface of a steel sheet contg. specified amts. of C and sol. Al. CONSTITUTION:The surface of a steel sheet consisting of <=0.2% C, 0.005-0.08% sol. Al and the balance Fe with inevitable impurities or further contg. 1-25% Cr, 1-10% Ni and 0.03-0.3% Ti is plated with Ni by electroplating or other method to form an Ni layer by 50-2,000mg/m<2>. A layer of one or more among Ni, Sn and Zn is formed on the Ni layer by electroless plating by 1-100mg/m<2> and a chromate coating layer is further formed by 1-50mg/m<2> (expressed in terms of Cr). Since the pinholes in the Ni layer are covered by the substitution deposition of the electroless plating metals, the corrosion resistance of the resulting Ni plated steel sheet for a vessel is considerably improved. |
