ANTI-CORROSION SOL-GEL HYBRID COATING ON ZINC AND ZINC ALLOY STEEL SHEETS AND PREPARING METHOD THEREOF

摘要

An anti-corrosion sol-gel hybrid coating composition for metal surfaces and a preparing method thereof are provided. The coating composition comprises a first organosilane compound having at least one epoxy group and at least one hydrolysable alkoxy group, a second organosilane compound having no epoxy group and two or more hydrolysable alkoxy groups, a corrosion inhibiting compound having phosphate functionality, a polar solvent selected from the groups consisting of ethanol, methanol, n-propanol, isopropanol, n-butanol, isobutanol, and the mixture thereof, an acid selected from acetic acid, citric acid, phosphoric acid, hydrochloric acid and the mixture thereof, and water.