Surface treatment for metal materials, surface treatment process, and surface- treated metal materials
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A technology for surface treatment agents and metal materials, applied in metal material coating technology, devices for coating liquid on the surface, metal layered products, etc., can solve uneconomical, insufficient corrosion resistance of damaged parts, and heat-resistant discoloration Insufficient technical aspects of corrosion resistance and chemical resistance, etc., to achieve the effect of high utilization value and excellent corrosion resistance
Inactive Publication Date: 2008-12-17
NIHON PARKERIZING
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[0010] Japanese Patent Laid-Open No. 2004-183015 and Japanese Patent Laid-Open No. 2003-13252 have the advantage of not containing hexavalent chromium and excellent corrosion resistance. However, in terms of technology that has both thermal discoloration resistance
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[0100] Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely together with the effect of this invention, these Examples are only illustrations, and this invention is not limited to these Examples.
[0101] Hereinafter, for the case where hot-dip galvanized steel sheets, galvanized steel sheets or magnesium-aluminum alloy sheets are used as test materials, the preparation of the surface treatment agents (Tables 1 to 7), test materials and their properties of the examples and comparative examples are described in sequence. Pretreatment and surface treatment, description of evaluation methods, interpretation of evaluation results, and evaluation results (Tables 8 to 14). Hereinafter, the test and the result of the case where the cold-rolled steel plate was used as a test material are demonstrated.
[0102] 1. Preparation of surface treatment agent
[0103] Using the combinations and ratios shown in Tables 1 to 7, ...
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Abstract
A surface treatment for metal materials obtained by incorporating an anionic water-dispersible resin (A) having a glass transition temperature of 0 DEG C or above and at least one member (B) selected from the group consisting of alkali metal silicates and basic zirconium compounds in water, wherein the alkali metal silicates have M2O/SiO2 mass ratios of 1/1000 to 6/10 with M being at least one element selected from the group consisting of lithium, sodium and potassium; a surface treatment process; and surface-treated metal materials. The invention provides a chromium-free surface treatment for metal materials which is useful for imparting excellent corrosion resistance, chemical resistance, thermal discoloration resistance and weather resistance to metal materials. Additional incorporation of one or more members selected from among silane coupling agents, vanadium compounds, titanium compounds, organophosphonic acids, polyhydric alcohol phosphates, inorganic acids, salts thereof, metal fluorides, and metal oxides brings about further improvement in the performance of the treatment.
Description
technical field [0001] The present invention relates to a metal surface treatment agent for forming a chromium-free film that can impart corrosion resistance, chemical resistance, thermal discoloration resistance, and weather resistance on the surface of a thin plate coil or a molded product made of metal, and surface treated metal materials. More specifically, the present invention relates to building materials such as automobile parts, home appliances, outer wall materials, and pillars of agricultural plastic greenhouses made of iron, zinc, galvanized steel, galvanized aluminum alloy steel, aluminum, and aluminum alloys. Products, guard rails, sound insulation walls, drainage ditches and other civil engineering products such as sheet coils, formed products, castings, etc. are formed to provide excellent corrosion resistance, chemical resistance, heat discoloration resistance and weather resistance, and does not contain A surface treatment agent for a chromium film, a surfac...
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