Chemical conversion treatment solution and chemically converted steel sheet

a technology of chemical conversion treatment and chemical treatment solution, which is applied in the direction of coating, metallic material coating process, hot-dipping/immersion process, etc., can solve the problems of adverse influences, low design, blacked surface of chemically treated steel sheet, etc., and achieve excellent corrosion resistance and blackening resistance

Inactive Publication Date: 2016-08-18
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]According to the present invention, it is possible to produce a chemically treated steel sheet excellent in corrosion resistance and blackening resistance even when a chemical treatment solution applied to the surface of a zinc-based plated steel sheet is dried at a low temperature and for a short period of time.

Problems solved by technology

However, when the chemically treated steel sheet obtained by forming the chromium-free chemical conversion film on the surface of the zinc-based plated steel sheet is stored for a long period of time under high temperature and humid environment, the chemically treated steel sheet sometimes has a blacked surface of a plating layer due to oxidization.
The blackening of the surface of the plating layer not only lowers the design but also cause adverse influences such as lowering of spot weldability.

Method used

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  • Chemical conversion treatment solution and chemically converted steel sheet
  • Chemical conversion treatment solution and chemically converted steel sheet
  • Chemical conversion treatment solution and chemically converted steel sheet

Examples

Experimental program
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Effect test

example 1

[0072]A water-soluble molybdenum salt, a vanadium salt, an amine, a group 4A metal oxoate, and a phosphate, which are shown in Table 1, were dissolved in water to prepare chemical treatment solutions 1 to 50. The name and symbol of each compound added to the chemical treatment solution are shown in Table 1. The composition and color of each chemical treatment solution are shown in Tables 2-1, 2-2, 3-1, 3-2, 4-1 and 4-2. Note that the dissolution of the vanadium salt was performed in an aqueous solution having a liquid temperature of 40° C. or lower containing an amine for preventing vanadium from being reduced.

TABLE 1TypeSymbolCompound NameChemical FormulaMolecular WeightMolybdateM1Ammonium Molybdate(NH4)6Mo7O24•4H2O—Vanadium SaltV1Vanadium PentoxideV2O5—V2Ammonium MetavanadateNH4VO3—V3Sodium MetavanadateNaVO3—AmineEAEthanolamineC2H7NO61DEADiethanolamineC4H11NO2105IPA1-Amino-2-PropanolC3H9NO75TMAHTetramethylammonium hydroxide(CH3)4N+OH−91EDTAEthylenediaminetetraacetic Acid(HOOCCH2)2...

example 2

[0097]Next, chemically treated steel sheets Nos. 37 to 100 were produced in the same manner as chemical treated steel sheet No. 1 except that the type and the deposition amount of the chemical treatment solutions were changed as shown in the following tables, and were evaluated in the same manner as chemically treated steel sheets Nos. 1 to 36. The results are shown in the following Tables 7-1, 7-2, 8-1, 8-2, 9-1, 9-2, 10-1, and 10-2.

TABLE 7-1Ratio of Each ElementChemically TreatedChemicalFilmDryingin Chemically Treated FilmSteel SheetTreatment SolutionDeposition AmountTemperature(Parts by Mass)CategoryNo.No.(mg / m2)(° C.)MoVPEx.37192004056.520.050.0Ex.3820500401.92.050.0Ex.39215004060.020.01.3Ex.402210040480.0160.05.0Ex.41233004060.020.050.0Ex.422410004042.214.91.8Ex.43255004039.66.05.0Ex.4426400400.50.742.9Ex.45272504060.020.050.0Ex.46281004094.211.11.9Ex.4729150402.02.21.1Ex.48305040131.820.05.0Ex.49311004046.726.76.7Ex.5032400401.52.05.0Ex.5133250403.51.31.3Ex.523410000400.20.31....

example 3

[0108]A chemically treated steel sheet produced according to the following procedure was provided. For an original sheet for chemical treatment, a steel strip of ultra-low carbon titanium-added steel having a sheet thickness of 0.5 mm was used as the substrate steel to produce a hot-dip zinc plated steel sheet of having a zinc-based layer containing 0.018 mass % of aluminum (plating deposition amount of 90 g / m2 per side), in a continuous hot-dip zinc plating production line, and the produced plated steel sheet was used as the original sheet for chemical treatment.

[0109]The surface of the original sheet for chemical treatment was degreased, and dried. Then, each of chemical treatment solutions Nos. 19 to 50 shown in Tables 2-1, 2-2, 3-1, 3-2, 4-1, and 4-2 was applied to the surface of the original sheet for chemical treatment, and immediately thereafter heated and dried at a low temperature (a temperature of the steel strip of 40 or 80° C.) using an automatic discharge type electric ...

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Abstract

A chemically converted steel sheet having a chemically converted coating film is made by coating a Zn-based plated steel sheet with a chemical conversion treatment solution and drying the same. The chemically converted coating film is constituted by a first chemically converted layer including V, Mo, and P, and a second chemically converted layer provided on said layer and including a group 4A metal oxygen acid salt, and the ratio of pentavalent V to all the Vs in the chemically converted coating film is 0.7 or greater. The chemical conversion treatment solution includes specific proportions of V, Mo, an amine, the group 4A metal oxygen acid salt, and P, and substantially does not include hydrophilic resins, fluorine, or silicon.

Description

TECHNICAL FIELD[0001]The present invention relates to a chemically treated steel sheet, and a chemical treatment solution for a zinc-based plated steel sheet.BACKGROUND ART[0002]Zinc-based plated steel sheets have been used in wide applications such as automobiles, building materials, and home electric appliances. Typically, the surface of a plated steel sheet is subjected to a chromium-free chemical treatment for imparting corrosion resistance without oiling. The chromium-free chemical treatment is roughly divided into organic treatments and inorganic treatments. The organic treatments allow a thick film containing an organic resin to be formed, whereas the inorganic treatments allow a thin film (film thickness: 1 μm or less) to be formed for obtaining spot weldability. The organic treatments can impart relatively high corrosion resistance compared to the inorganic treatments. Some of the inorganic treatments also exhibit high corrosion resistance in the same degree as the organic ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C22/60
CPCC23C2/06C23C22/60C23C2222/20C23C2/40C23C22/62C23C22/40
Inventor IWAMIZU, YOSHIHARUSHIMIZU, ATSUOMATSUNO, MASANORIYAMAMOTO, MASAYA
Owner NISSHIN STEEL CO LTD
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