Corrosion-resistant surface-coated steel sheet

摘要

A surface-coated steel sheet having improved corrosion resistance and suitable for use as automobile inner and outer panels comprises a steel sheet having on at least one surface thereof a composite coating which comprises the following layers (a) to (d) from the bottom to the top of the coating: (a) a first zinc alloy plating layer with a coating weight of 10-100 g/m2 which contains at least one of Ni and Co in an amount satisfying the following inequality: 0.05