Anticorrosive coating composition and anticorrosion treatment method

摘要

The present invention provides an inexpensive, non-chromium anticorrosive coating composition and anticorrosion treatment method, which are superior in anticorrosion to conventional chromium-containing anticorrosive compositions. The anticorrosive coating composition of the invention comprises 0.2 to 50 g thiocarbonyl group-containing compound and 0.1 to 5 g phosphate ions in one liter of a composition based on the total amount of the aqueous resin and water or further comprises 10 to 500g of water-dispersible silica. The anticorrosion treatment method of the invention comprises coating zinc type coated steel or non-coated steel with the anticorrosive coating composition.