Novel water-based rust-conversion coating and preparation method thereof

Abstract

The invention relates to a novel water-based rust conversion coating and a preparation method thereof. The coating comprises the following components in parts by weight: 30-70 parts of water-based epoxy emulsion, 5-20 parts of a rust conversion agent, 0.5-5 parts of a penetrating agent, 5-10 parts of aluminum triphosphate, 10-20 parts of barium sulfate and 0.6-5 parts of a functional additive, wherein the water-based epoxy emulsion is a cationic water-based acidic modified epoxy emulsion. According to the invention, the cationic water-based acidic epoxy emulsion is selected as a film-forming substance and has good compatibility with an acidic rust conversion agent; based on single-component normal-temperature curing, compared with a modified water-based acrylic acid system, a paint film ofthe coating is good in water resistance and salt water resistance, good in salt spray resistance, high in adhesive force, high in hardness and excellent in storage stability. The coating is high in rust conversion rate and can chemically react with rust to generate a black compact and stable chelate, so that the purposes of rust removal, rust prevention and rust stabilization are achieved.