Aqueous fluid for surface treatment of zinc-plated steel sheets and zinc-plated steel sheets

A technology of galvanized steel sheet and treatment liquid, which is applied in the direction of metal material coating process, anti-corrosion coating, coating, etc., can solve the problems that cannot be used or have not been solved, and achieve the effect of excellent grounding performance

Inactive Publication Date: 2010-03-31
NIHON PARKERIZING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the problem that simple equipment such as the existing spray wringer and spray wringer cannot be used and new equipment investment in the galvanizing line (CGL, EGL) has arisen, but this problem has not been solved

Method used

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  • Aqueous fluid for surface treatment of zinc-plated steel sheets and zinc-plated steel sheets
  • Aqueous fluid for surface treatment of zinc-plated steel sheets and zinc-plated steel sheets
  • Aqueous fluid for surface treatment of zinc-plated steel sheets and zinc-plated steel sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0066] Fabrication of surface-treated galvanized steel sheets as test panels

[0067] In the following examples, galvanized steel sheets (GI, GA, EG: GI, GA, and EG with a size of 200mm×300mm and a thickness of 0.8mm were prepared respectively) were subjected to alkaline degreasing to wash off the antirust oil, and washed with water. Rinse off the degreasing solution, rinse with pure water, and then dry with warm air, and use the resulting material as a test panel. Evaluation tests described later were performed using, as test panels, surface-treated galvanized steel sheets in which a film was formed on the surface of the test panel by various aqueous treatment solutions.

[0068] Components used in aqueous treatment fluids

[0069] Component (A): commercially available ammonium zirconium carbonate (as ZrO 2 Counted as 20% by mass)

[0070] ingredient (B)

[0071] B-1: Vanadium(IV) oxalate

[0072] B-2: Vanadyl(IV) sulfate

[0073] B-3: Vanadyl(IV) acetylacetonate

...

Embodiment 1

[0134] For No.1 in Table 1 below, 6.2 g of B-1 (vanadium (IV) oxalate) was dissolved in pure water and 22 g of (C) organic phosphonic acid, and the pH was raised to 8. Then, (A) 213 g of ammonium zirconium carbonate was added, and 175 g of D-1 water-dispersible acrylic resin was added, stirred and dissolved, G-11 g was added as an antifoaming agent, and pure water was added to make the total amount 1 kg. The pH of this aqueous treatment liquid was 9.0, and the solid content was 10% by mass. Other aqueous treatment liquids having the compositions shown in Table 1 were prepared in the same procedure (all dry solids adjusted to 10% by mass). At this time, the same components as No. 1 were used except for the water-dispersible acrylic resin.

[0135] Here, a treatment solution obtained by adding 3 g of (E) guanidine carbonate to the treatment solutions of No. 1 and No. 7 was also prepared, and the treatment solution with (E) added and the treatment solution without (E) added wer...

Embodiment 2

[0142] For No. 17 in Table 2, 3.3 g of B-1 (vanadium (IV) oxalate) was dissolved in pure water and (C) 15 g of organic phosphonic acid, and the pH was raised to 8 with 28% by mass of ammonia water. Then, add (A) 224g of ammonium zirconium carbonate, then add 200g of D-1 water-dispersible acrylic resin, further add (E) 5g of guanidine carbonate, stir and dissolve, then add G-21g as a defoamer, add water to make the total amount It is 1kg. The pH of this aqueous treatment liquid was 9.5, and the solid content was 10% by mass. Other aqueous treatment liquids having the compositions shown in Table 2 were prepared in the same procedure (all dry solids were adjusted to 10% by mass). At this time, the same thing as No. 17 was used for each component, and the addition amount of each of (E) and G-2 was the same as No. 17.

[0143] The water-based treatment solutions prepared above are poured onto the surface of the galvanized steel sheet (GI) to wet the entire surface, and then the e...

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Abstract

The invention provides an aqueous fluid for surface treatment of zinc-plated steel sheets and a filmed zinc-plated steel sheets which are formed by the fluid. The aqueous fluid for treatment of zinc-plated steel sheets which comprises (A) ammonium zirconium carbonate, (B) a vanadium (IV) compound, (C) an organophosphonic acid represented by the general formula (I) or an ammonium salt thereof, (D)an anionic water-dispersible acrylic resin having a glass transition temperature (Tg) of 0 to 60 DEG C as obtained by converting the absolute temperature (K) calculated by the numerical formula (1) toCelsius temperature (DEG C), and water and which has a content of (D) of 1 to 60% by mass based on the whole solid matter, a content of (B) of 0.5 to 8% by mass in terms of V based on the whole solidmatter, a V/(C) mass ratio of 0.05 to 1.0, a Zr/(V+(C)) of 0.1 to 6.0% by mass (as calculated by converting (A) to Zr), and a pH of 7 to 10; and zinc-plated steel sheets bearing films resulting fromthe fluid on the surface. The steel sheets of the invention are excellent in corrosion resistance, alkali resistance, appearance, condensed dew resistance, coatability and groundability. The fluid canbe used in treatment equipment similar to that of temporary rust preventive chromate treatment in the manufacturing line for zinc-plated steel sheets.

Description

technical field [0001] The invention relates to an aqueous surface treatment liquid for galvanized steel sheets and galvanized steel sheets. Background technique [0002] At present, from the viewpoint of ensuring corrosion resistance, the steel sheet surface of a galvanized steel sheet is often galvanized. In addition, in order to improve corrosion resistance, alloyed galvanized steel sheets to which various metals are added are also used. [0003] In addition, places affected by acid rain and soot such as industrial areas or places affected by flying sea salt particles such as coastal areas have very harsh environments, and galvanized steel sheets with better corrosion resistance are desired. Therefore, hot-dip Zn-5%Al alloy steel sheets, hot-dip galvanized-Al-Mg alloy steel sheets, hot-dip galvanized-55%Al alloy steel sheets, aluminum-coated steel sheets, and hot-dip galvanized-55%Al alloy steel sheets with further improved corrosion resistance of galvanized steel sheets...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/60C09D5/08C23C22/68
CPCC23C22/60C23C22/68C09D5/084C09D5/08C23C22/13
Inventor 河上克之内田淳一水野贤辅
Owner NIHON PARKERIZING
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