A kind of aqueous chrome-free dacromet coating solution and preparation method thereof

Abstract

The invention discloses water-based chrome-free Dacromet coating solution. The coating solution is environment-friendly, is free of environmental pollution and simultaneously has good corrosion and weather resistance. The coating solution comprises components A, components B, a component C and components D, wherein the components A include 18-24% of zinc powder, 2-5% of aluminium powder, 28-34% of wetting and dispersing agent, 1-3% of passivator, 1-3% of corrosion inhibitor and water by mass; the components B include 5-12% of film-forming agent, 0.1-0.5% of forming auxiliaries and water by mass; the component C is 5-12% of film-forming auxiliary by mass; the components D include the balance of thickener and water; and the total mass percent of water is 18-27%.

Description

technical field [0001] The invention relates to a dacromet coating liquid and a preparation method thereof, in particular to a water-based chrome-free dacromet coating liquid and a preparation method thereof. Background technique [0002] Corrosion of metals is very common, and the loss to the national economy is very huge. Dacromet technology is a new metal surface anti-corrosion technology developed in recent years. It was invented by the American DIAMOND SHAMROCK company in the late 1960s. The biggest advantage of Dacromet coating is that it has excellent corrosion resistance, and its corrosion resistance can be improved by 7-10 times compared with the traditional galvanized surface treatment process; the coating has no hydrogen embrittlement, especially suitable for high-strength Stressed parts; the coating has high heat resistance and a heat resistance temperature of 300°C, especially suitable for high-strength components of automobile and motorcycle engine parts; at t...

AI Technical Summary

Problems solved by technology

Cr 6+ It is highly toxic and has a carcinogenic effect on the human body, and it also has a great poisonous effect on crops and microorganisms; at the same time, although most of the Cr in Dacromet paint 6+ Participate in the reaction and transform into Cr during the baking film formation process 3+ , but there is still a small amount of chromium in the form of soluble Cr 6+ The form of Dacromet is retained in the Dacromet coating, which will cause harm to the human body and the environment during use

[0003] The problem of hexavalent chromium is a worldwide problem at present, which limits the wide and in-depth application of this technology

Among them, Geomet coating has not been accepted by domestic manufacturers due to the influence of its price factor; and Delta coating, because it uses resin as its film-forming substance, leads to its harsh production environment and cannot be widely recognized; BNC water-based non-toxic Chromium-zinc-aluminum coating is less used in China