| 摘要 |
PURPOSE:To further improve the corrosion resistance of a steel sheet having improved corrosion resistance by the chemical conversion treatment of the surface without deteriorating the electrical conductivity by filling a specified part of the recesses of the uneven surface with paint and leaving the projections. CONSTITUTION:The surface of a steel sheet such as a cold rolled steel sheet, a hot dip galvanized steel sheet, a galvanized steel sheet, an alloy plated steel sheet, a stainless steel sheet or an electrolytically chromated steel sheet is subjected to chemical conversion treatment with a treating soln. such as a chromate soln., a zinc phosphate soln. or an iron phosphate soln. The finely uneven surface of the steel sheet is then coated with paint such as melamine- alkyd resin, polyester, fluororesin, acrylic resin or silicone resin paint so as to fill 5-80% of the total volume of the recesses of the uneven surface with the paint and projections left uncoated. Thus, a steel sheet having superior corrosion resistance due to the paint filled recesses as well as electrical conductivity due to the uncoated projections is obtd.
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