Zinc rust-preventive paint, and a manufacturing method for the surface modification of zinc as the primary corrosion inhibitor

摘要

Zinc-rich, anti-corrosive paint is prepared from surface reformed zinc powder by coating it with a tannic acid film comprising of carboxylic acid salt on the surface of zinc dust. The surface ofd the zinc dust particles is reformed by a reaction between tannic acid or its derivatives. i.e., hydrolyzed tannic acid, condensed tannic acid, gallotannin, or gallic acid dissolved in a polar solvent and an epoxy resin added into a gel of a viscosity increasing agent. The ratio of the tannic acid or its derivative to the zinc powder is 0.5 - 2.0 wt.%.