Galvanized sheet treating agent

Abstract

The invention provides a galvanized sheet treating agent. Particularly, when the galvanized sheet treating agent is used for treating the surface of a galvanized metal product, the excellent anti-rust performance can be achieved, and the anti-corrosion performance of the surface of the galvanized metal product is equivalent to the anti-corrosion performance of the metal surface treated by a chromium-containing metal surface agent. The galvanized sheet treating agent is an aqueous solution, and is characterized by comprising, by mass percentage, 12%-25% of one or more kinds of fluozirconic acid, fluotitanic acid, zirconium tetrafluoride, potassium fluorozirconate and fluosilicic acid, 0.5%-5% of silica sol, 0.5%-1.0% of organic silicon acrylic acid, 5%-12% of water-soluble epoxy resin, 0.5%-5% of carboxymethyl cellulose, 0.5%-5% of sodium nitrate, 0.4%-2.5% of adhesion promoters, 0.1%-1% of rare earth additives, 0.8%-2.4% of addition agents and the balance deionized water. The galvanized sheet treating agent can obviously improve the anti-rust performance of a product, is easy to use and is free of special requirements for equipment.

Description

technical field [0001] The invention relates to a treatment agent for galvanized sheet, which can replace the commonly used metal surface treatment agent containing chromate, especially for the treatment of galvanized metal by replacing the metal surface treatment agent containing chromate. Compared with the treatment agent containing chromate, the galvanized sheet treatment agent of the present invention has better antirust performance, especially can prevent white rust for a long time. Background technique [0002] Zinc or aluminum in metal materials such as zinc-plated steel plates and aluminum plates is easy to corrode in the atmosphere, producing a corrosion product called white rust, which not only affects the appearance of the metal material, but also has an adverse effect on the airtightness of the paint. The commonly used chromate treatment is to treat these metal materials with a metal surface treatment agent containing chromic acid, which is a widely used technica...

AI Technical Summary

Problems solved by technology

[0005] Several galvanized sheet treatment agents have been proposed at present, including coating galvanized steel sheets with inorganic silicates and then treating them with organic silicon (such as U.S. Patent 5,108,793), but there are still many problems in them, and their antirust performance is not enough. To achieve the effect that can be achieved with metal surface treatment agents containing chromate, in addition, the stability of the treatment liquid can not meet the requirements, and the treatment process is complicated, the on-site process can not meet the requirements, and there are other problems such as poor film uniformity , The acid and alkali of the treatment liquid will affect the workpiece, etc.

The main reason is that the components of these treatment solutions are too simple, and a variety of influencing factors are not considered, especially the effect of the combination of water-soluble silica gel and dispersible silica gel on the galvanized sheet

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