Chromium-free zinc aluminum anticorrosive paint and preparation method

Abstract

The invention relates to a chromium-free zinc aluminum anticorrosive paint and a preparation method. The invention adopts the technical scheme that the preparation method comprises the following steps of: stirring 5 to 25 weight percent of flake zinc powder and 5 to 15 weight percent of flake aluminum powder uniformly, adding 25 to 40 weight percent of organic solvent, 1.1 to 1.8 weight percent of dispersant, 3 to 8 weight percent of corrosion inhibitor and 3 to 10 weight percent of inorganic additive into the powder, and stirring the mixture for 20 to 40 minutes to form a base material; and then stirring 5 to 15 weight percent of modified resin, 1 to 3 weight percent of organic silane coupling agent and 25 to 30 weight percent of organic solvent uniformly, and adding the mixture into the base material; or stirring the mixture for 30 to 50 minutes to obtain the chromium-free zinc aluminum anticorrosive paint; or stirring the mixture for 30 to 50 minutes, adding 0.05 to 0.5 weight percent of hydroxyethyl cellulose into the mixture, and stirring the mixture for 20 to 50 minutes to obtain the chromium-free zinc aluminum anticorrosive paint. The preparation method has the characteristics of environment friendliness, low energy consumption and low cost; and a coating coated by the prepared chromium-free zinc aluminum anticorrosive paint has high impact strength, good corrosion resistance, strong bonding force and high hardness.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion coatings, and in particular relates to a chromium-free zinc-aluminum anti-corrosion coating and a preparation method. Background technique [0002] Due to poor corrosion resistance, high energy consumption, serious pollution, hydrogen embrittlement, and the use temperature is limited by the aging temperature of the passivation film, the traditional electro-galvanizing and hot-dip galvanizing processes can only be used below 100°C, which has great limitations sex. Zinc-aluminum coating (Dacromet coating) has been widely used in the fields of automobile, medicine, electric power, petroleum and military industry due to its incomparable advantages over traditional electro-galvanizing and hot-dip galvanizing. Zinc-aluminum coating is a mixture composed of flaky zinc powder and aluminum powder, chromic anhydride, wetting agent, dispersant, deionized water and other additives, stirred evenly, coa...

AI Technical Summary

Problems solved by technology

Because the diluent uses toxic and harmful organic solvents such as toluene and xylene, it pollutes the environment

Furthermore, although the film layer has good adhesion, the corrosion resistance is not high, the hardness is not high, and the film thickness is too thick.

A patented technology of chromium-free dacromet coating (CN101260252A), the coated metal parts are cured at 200-400 °C, the curing temperature required for the treatment process is high, and the energy consumption is large