The present invention relates to a surface treatment composition for improving corrosion resistance and weldability of a steel sheet having a zinc alloy plating layer containing magnesium (Mg) and aluminum (Al), which is used for a metal material, The present invention relates to a method for surface treatment of a steel sheet and to a gold coated steel sheet surface-treated with the composition. The present invention can provide an alloyed gold-plated steel sheet which has corrosion resistance, black degeneration, conductivity, and weldability without concern for installation of additional equipment, an increase in manufacturing cost, and environmental pollution problems.
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