The present invention addresses the problem of providing a water-based anticorrosive coating composition which can impart satisfactory anticorrosive properties to various metallic materials. This water-based anticorrosive coating composition comprises a water-based main component (I) and a water-based hardener (II), wherein the water-based main component (I) comprises an aqueous epoxy resin dispersion (A) and an inorganic rust-preventive pigment (B) and the water-based hardener (II) includes a polyamine compound (D) containing an aromatic group and a thiazole compound (C).
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