WATER-BASE COATING COMPOSITION AND COATED STEEL SHEET

摘要

A water-base coating composition that is suitable for use in marine vessels, bridges, etc., excelling in luster, coating film appearance and corrosion resistance, and that even when applied under high-humidity conditions, is free from deterioration of these properties; and a coated steel sheet having the above water-base coating composition applied thereto. There is provided a water-base coating composition containing a water-dispersed vinyl modified epoxy ester resin and calcium carbonate, characterized in that the calcium carbonate is precipitated calcium carbonate having been treated with a salt of carboxylated vinyl polymer and contained in a ratio of 20 to 50 vol.% based on the solid contents of the coating composition, and that the volume ratio of coating composition pigment/whole solid contents is 50% or below.