Intercalated zinc-aluminum alloy powder and its prepared zinc-aluminum synergistic anticorrosion coating and method

Abstract

The invention discloses intercalated zinc-aluminum alloy powder and zinc-aluminum synergetic anticorrosive paint prepared from the same and a method. The intercalated zinc-aluminum alloy powder is prepared through the following method comprising the steps that 1, a zinc chloride molten salt electrolyte and an aluminum chloride molten salt electrolyte are mixed and stirred to obtain a mixed molten salt electrolyte; 2, electrolytic deposition is conducted in the mixed molten salt electrolyte by taking a copper sheet as a cathode and taking graphite as an anode; 3, the copper sheet is taken out and washed, deposit cleaning, filtering and vacuum drying are conducted, and the intercalated zinc-aluminum alloy powder is obtained. The zinc-aluminum synergetic anticorrosive paint is prepared from the intercalated zinc-aluminum alloy powder, an organic solvent, an anti-settling agent and electroconductive resin. The preparation method comprises the steps that the intercalated zinc-aluminum alloy powder and the organic solvent are mixed, the anti-settling agent is added while stirring, the electroconductive resin is added, and then the zinc-aluminum synergetic anticorrosive paint is obtained. According to the intercalated zinc-aluminum alloy powder, the alloy morphology and the microalloying degree are controllable; by applying the intercalated zinc-aluminum alloy powder to the zinc-aluminum synergetic anticorrosive paint, the anticorrosive property is better compared with existing hot-dip galvanized anticorrosive paint and zinc-aluminum anticorrosive paint. The method is low in energy consumption and pollution.

Description

technical field [0001] The invention relates to a zinc-aluminum alloy powder and its prepared anti-corrosion coating and method, in particular to an intercalated zinc-aluminum alloy powder and its prepared zinc-aluminum synergistic anti-corrosion coating and method which can replace hot-dip galvanizing. Background technique [0002] Molten salt electrodeposition to prepare electrodeposited coatings is a method of obtaining metal coatings or alloy powders on substrates in molten inorganic salts, organic salts or ionic liquids, using external voltage and current, and controlling current density. The molten salt electrodeposition method has no problems such as hydration, hydrolysis and hydrogen evolution, and is pollution-free. It has been widely used at present. The molten salt electrodeposition method was first used to coat an aluminum layer on a steel substrate, and it was rapidly popularized due to its dense coating, controllable thickness, and low energy consumption. Subse...

AI Technical Summary

Problems solved by technology

There are many kinds of anti-corrosion coatings, among which cold-coated zinc is the most excellent. The zinc content of the dry film of cold-coated zinc is higher than 96%, and its corrosion resistance, heat resistance and durability are all outstanding. Bright silver metallic luster without zinc

And such as CN103952026 A (a kind of water-soluble zinc-aluminum anticorrosion coating and its preparation method), CN101899254 A (a kind of chrome-free zinc-aluminum anticorrosion coating and its preparation method), CN105820677 A (a kind of nanoscale environmental protection high intercalation water-based modified anticorrosion Patents such as coatings and their preparation methods) and the products they transform, improve the appearance of anti-corrosion coatings by introducing bright metal and reducing the content of zinc powder, but this sacrifices part of the anti-corrosion performance

This type of zinc-aluminum anti-corrosion coating only adds zinc and aluminum as fillers to the resin in a certain proportion. Due to the difference in particle size and shape of zinc powder and aluminum powder, gaps are easy to appear between the particles after drying, and it is difficult to ensure the uniformity of the dry coating. Density, also easy to cause the phenomenon of coating peeling off

At the same time, due to the different self-corrosion potentials and corrosion rates of zinc and aluminum, it is difficult to achieve the synergistic anticorrosion effect of zinc and aluminum.

Images