Surface treatment solution composition for ternary hot-dip galvanized alloy steel sheet imparting excellent blackening resistance and alkali resistance, ternary hot-dip galvanized alloy steel sheet surface-treated with same, and method for manufacturing same

Abstract

The present invention relates to a surface treatment composition comprising, with respect to 100% by weight of solids of the composition: 20-40% by weight of a water-soluble polyurethane resin; 40 to 60 wt% of a silane-based sol-gel resin cross-linked by three silane compounds; 5-15 wt% of a curing agent; 0.5 to 1.5 wt% of an anti-rust corrosion resistant agent; 0.1 to 1.0 wt% of a molybdenum-based compound; 1.0 to 3.0 wt% of a silane coupling agent; 1.0 to 2.0 wt% of an organometallic complex; 1.0 to 2.0 wt% of an acid removal agent; 0.1 to 1.0 wt% of an aluminum-based compound; and 1.0 to 2.0 wt% of a lubricant. The ternary hot-dip galvanized alloy steel sheet treated with the chromium-free surface treatment coating according to one embodiment of the present invention particularly has excellent effects of blackening resistance, alkali resistance, and corrosion resistance, and can provide excellent effects. And the problems of installation of additional equipment, increase of manufacturing cost and environmental pollution in order to treat chromium are solved.

Description

technical field [0001] The present invention relates to a kind of surface treatment solution composition that is applied to the surface of metal material and application thereof, in more detail, relates to a kind of composition that is used for improving and is used as household appliances and has magnesium (Mg) and aluminum (Al) Chromium-free surface treatment solution composition for blackening resistance, alkali resistance and corrosion resistance of ternary system hot-dip galvanized alloy coated steel plate, ternary system hot-dip galvanized alloy for surface treatment using said solution composition Steel plate and its manufacturing method. Background technique [0002] Generally, a steel sheet having a hot-dip galvanized alloy coating layer containing magnesium (Mg) and aluminum (Al) is a steel material having excellent corrosion resistance to red rust compared to a pure zinc-plated steel sheet. [0003] Most of the exposed surface of this hot-dip galvanized alloy coa...

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Problems solved by technology

[0006] As an example, in Japanese Laid-Open Patent Publication No. 53-28857 and Japanese Laid-Open Patent Publication No. 51-71233, by containing aluminum phosphate or by tannic acid and aromatic carboxylic acids such as sodium acetate, sodium borate, imidazole, surface active The combination of agents, etc. forms a thin film substance, but the corrosion resistance decreases

In addition, Japanese Laid-Open Patent Publication No. 2002-332574 discloses a surface treatment agent composed of zirconium carbonate, vanadium ions, zirconium compounds, etc. Although the corrosion resistance of the surface treatment agent is good, the blackening resistance is poor

[0007] And, the surface treatment agent that is made up of titanium-based, zirconium-based, phosphoric acid-based, molybdenum-based compounds etc. is disclosed in Japanese authorized patent publication No. 7-096699, but in hot dipping using magnesium (Mg) and aluminum (Al) etc. Blackening cannot be suppressed in galvanized alloy steel sheets

In addition, the surface treatment agent that is made up of ammonium molybdate, water-dispersible urethane resin, isopropylamine, zirconium carbonate ammonium, epoxy silane coupling agent, silica sol is disclosed in No. In this case, the thickness of the surface treatment coating film increases, so it is difficult to apply to the position where electrical conductivity and weldability are required, and when the thickness is reduced, there is a problem that sufficient corrosion resistance cannot be imparted

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