Environment-friendly surface treating agent used for galvanized steel sheet, galvanized steel sheet and manufacturing method for galvanized steel sheet

Abstract

The invention discloses an environment-friendly surface treating agent used for a galvanized steel sheet, wherein an aqueous solution of the environment-friendly surface treating agent consists of the following solid components in parts by mass: 30-55 parts of modified enclosed type cationic polyurethane resin A, 32-60 parts of a silane coupling agent B comprising an organic silane coupling agent B1 with at least one amino functional group of activated hydrogen and an organic silane coupling agent B2 with at least one epoxy-group functional group in a ratio of B1 to B2 being 0.4-1, 3-15 parts of surface-grafting high-density polyethylene particles or surface-grafting polyamide particles C, 0.01-0.5 part of a vanadium-containing compound D in terms of an element vanadium, 0.5-1.5 parts of a phosphor-containing compound E in terms of an element phosphor, 0.1-1 part of a fluorine-containing titanium compound F in terms of an element titanium, and 0.01-1 part of a cerium-containing compound G in terms of an element cerium.

Description

technical field [0001] The invention relates to a surface treatment agent, in particular to a surface treatment agent coated on a steel plate. The invention also relates to a steel plate coated with the surface treatment agent and a manufacturing method of the steel plate. Background technique [0002] Galvanized steel sheets are generally used as parts of automobiles, home appliances, and OA products. Especially when used as parts such as motor housings, galvanized steel sheets are subjected to deep drawing and other stamping processes. In order to prevent white rust caused by corrosion of galvanized steel sheets during transportation and storage, it is necessary to apply anti-rust oil when producing steel sheets. In addition, in order to reduce the friction between the mold and the plate during the stamping process, prevent the plate from cracking and the surface zinc layer from being scratched, it is necessary to add lubricating oil to the mold during the stamping proces...

AI Technical Summary

Problems solved by technology

However, although the above-mentioned surface-treated steel plates have no appearance damage after cleaning with an alkaline degreasing agent, in fact, household appliance parts, micro-motors, etc. are mostly exposed to use, and the corrosion resistance of the steel plates is extremely high. The treatment method cannot fully guarantee the corrosion resistance of the steel plate after alkali cleaning, thus making the performance of the galvanized steel plate fail to meet the corresponding standards

[0007] The film layer formed on the surface of the steel plate disclosed in the above patent documents is either obtained through two coatings + two baking, or the steel plate coated with such a film layer cannot meet the specified performance requirements

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