KR101854195B1 - Process for Diect Zinc electroplating of Aluminum alloys - Google Patents

Abstract

The present invention relates to a method and a technology for directly zinc-electroplating an aluminum alloy. In particular, the present invention relates to a process technology and a method in which an aluminum alloy is directly zinc-electroplated as a simple pre-processing process without using desmut processing, zinc substitution processing (zincate processing), and undercoating that have been essentially used to secure an existing attaching property. The method for zinc-electroplating an aluminum alloy according to an embodiment of the present invention may include S10 (step 1), a degreasing step of eliminating and washing organic contaminants, foreign substances, and oxide coating on a surface of a plated material including aluminum and an aluminum alloy and S20 (step 2), an activating step of performing alkali etching, elimination of secondary oxide coating, and neutralizing an existing acid material to reinforce an attaching force of a plating layer when the degreased plated material is plated, and a plating step of directly performing zinc-electroplating the aluminum alloy that has undergone the cleaning pre-processing process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for producing an aluminum alloy,

[0001] The present invention relates to a process and a technique for directly subjecting an aluminum alloy material to electro-galvanizing treatment, and more particularly, to a process and a technique for directly subjecting an aluminum alloy material to electro- Which is characterized by a simple and direct treatment process free of zinc (also referred to as "zincate treatment"), which is excellent in adhesion to an aluminum alloy material.

Electroplating of aluminum and aluminum alloys is one of the surface treatment methods that impart various functions such as abrasion resistance, corrosion resistance, and magnetic characteristics, and is widely used in various industrial fields. Especially, in the case of industrial products and parts requiring light weight, .

However, since aluminum and aluminum alloys have high surface activity and high affinity with oxygen, there is an oxide film on the surface which is easily regenerated even when removed. Since such an oxide film hinders the adhesion of the plating film, a special pretreatment step for removing the oxide film before the plating step is required in order to apply the surface treatment method such as the plating process. For this reason, conventionally, as a pretreatment method, a separate zincate treatment called an impregnation treatment and an immersion plating or substitution plating is essentially performed, and after this treatment, a target final plating is performed through strike plating or electroless plating.

As described above, the conventional electroplating process has been carried out in a total of 16 processes as follows.
① Degreasing - ② Washing - ③ Etching - ④ Washing - ⑤ Dismantling - ⑥ Watering - ⑦ Waterproofing - ⑧ Waterproofing - ⑧ Waterproofing - ⑧ Waterproofing - ⑧ Waterproofing - ⑧ Waterproofing - ⑫ Waterproofing - ⑬ Strike plating or electroless plating Gold-14 SuSe-15 Zinc plating - SuSe 'complicated and many processing steps (16 process steps in total) to avoid the use of many chemicals and harmful substances, There was a problem that it was not possible.
In addition, in this conventional method, since the three-stage countercurrent washing method is standardized in the "washing process", there is always a problem that the washing water quantity is large and the wastewater treatment process is difficult. Therefore, the increase in the environmental load and the environmental contamination are inevitable, There is a fundamental problem.
Such a conventional electro-galvanizing method is disclosed in Korean Patent Publication No. 1019980067632 and the like.

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SUMMARY OF THE INVENTION The present invention has been made to solve all of the problems as described above and it is an object of the present invention to provide an electro-galvanizing treatment of an aluminum alloy which is excellent in plating quality and plating adhesion but can be plated in the shortest, Method.

It is another object of the present invention to provide an electro-galvanizing method of an aluminum alloy capable of avoiding chemical redundancy in each processing step in an electro-galvanizing process of an aluminum alloy and developing, shortening and purifying the minimum process, .

In order to achieve the above object, the present invention provides a method of electro-galvanizing an aluminum alloy, comprising the steps of immersing a plated material, which is an aluminum alloy, in an acidic degreasing liquid to form a natural oxide film on the surface of the material to be plated, A first step of preparing a first intermediate treatment material by cleansing and activating the surface of the material to be plated by dissolving and removing the retaining component adhering to the surface of the coating film and simultaneously performing surface adjustment on the primary surface thereof; A second step of immersing the first intermediate treatment material in an alkaline activation liquid to remove an oxide film formed on the surface of the first intermediate treatment material and preparing a secondary intermediate treatment material which is secondarily surface-adjusted; And a third step of directly plating zinc on the surface of the secondary intermediate treatment material as a negative electrode in an alkaline zincate type zinc plating solution, wherein the first intermediate treatment As the acid treatment liquid, 30 to 100 ml / l of sulfuric acid (95%), 20 to 65 g / l of sodium sulfate, 0.1 to 5 wt.% Of polyacrylic acid and 0.01 to 0.5 vol.% Of alkylphenol ethoxylate compound By using an aqueous solution in a range of 5 to 15 minutes for immersion treatment.

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At this time, the secondary intermediate treatment material is prepared by using an aqueous solution composed of 20 to 100 g / l of sodium hydroxide, 10 to 40 g / l of thioglycolate, and 0.1 to 0.5 wt% of a water-soluble polysaccharide compound as the alkaline treatment liquid It is preferable that the immersion treatment time is controlled within a range of 20 to 60 seconds.

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In the third step, the aluminum alloy material (1) is coated with 30 to 150 ml / l of sulfuric acid, 20 to 65 g / l of sodium sulfate, 0.1 to 5 wt% of polyacrylic acid as an inhibitor, And a water-soluble polysaccharide compound as an inhibitor in an amount of 0.1 to 0.5 wt.%, As a surfactant, in an amount of 20 to 100 g / l of sodium hydroxide, 10 to 40 g / l of thioglycolate as a complexing agent, , 10 to 30 g / l of a smoothing agent, 2 to 10 mℓ / l of a brightening agent, 0.1 to 1 mℓ / l of a nonionic surfactant, 12 to 20 g / l of a zinc oxide and 120 to 150 g / it is preferable to conduct electro-galvanizing directly on the aluminum alloy material by providing an electro-galvanizing layer 2 for electroplating with an alkaline cyanate zinc-based plating liquid.

INDUSTRIAL APPLICABILITY According to the present invention, zinc plating can be electrolytically deposited directly on an aluminum alloy material without zinc substitution treatment and strike plating or electroless plating.

That is, it is possible to use a desmutting treatment and its water washing step, a primary zinc substitution treatment step and its water washing step, a pickling step of dissolving and peeling the zinc coating film produced in the primary zinc substitution treatment, And the steps of the water washing step, the step of plating the strike or the step of electroless plating on the zinc film produced by the secondary zinc substitution treatment, and the step of washing the water are omitted, and the aluminum alloy material is directly electroplated with zinc It is possible.

Therefore, it is possible to drastically shorten the number of pretreatment processes for electro-galvanizing an aluminum alloy to four processes in comparison with the conventional process, so that it is possible to shorten the production time of the zinc-plated material and increase the production efficiency .

In addition, it is possible to realize a clean production process that can minimize the use of chemical agents and greatly reduce environmental pollution load.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a plating process according to the prior art applied to an aluminum alloy material for electro-
FIG. 2 is a whole process flow chart of direct electro-galvanizing an aluminum alloy material as a material to be plated according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a plating layer of an electro-galvanized product directly applied to an aluminum alloy material according to an embodiment of the present invention. FIG. 3 shows a chromate treatment after zinc plating.
4 is an SEM cross-sectional photograph of the actual specimen of FIG. 3 according to Example 5 of the present invention,
5A, 5B, 5C and 5D are photographs of specimens subjected to the bending test, the X-cutting and the hydraulic press in the adhesion test, showing no peeling of the plating layer,
Referring to FIG. 6, the shape of a communication antenna according to an embodiment of the present invention manufactured in this manner can be known,
FIGS. 7A and 7B are photographs of test results obtained by zinc plating and chromate treatment of 2024-series and 6061-series aluminum alloy specimens, and then subjected to an adhesion test at the Korea Chemical Fusion Testing Center.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Example)

A method of electro-galvanizing an aluminum alloy according to the present invention comprises: S10: a degreasing step (step 1) for removing and cleaning organic contaminants on the surface of a material to be plated made of aluminum and an aluminum alloy; Step S20: Activation process, which is a pre-treatment for cleaning to perform alkali etching and secondary oxidation film removal and neutralization of remaining acidic substances in order to enhance adhesion of the plating layer during plating of the plating material subjected to degreasing treatment in the above- ); And S30: an electro-galvanizing step (step 3) in which electro-galvanizing is directly performed on the aluminum alloy material that has undergone the above two-step process.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description of the drawings for explaining embodiments of the present invention is given below.

FIG. 2 is a flowchart showing an entire process of electro-galvanizing an aluminum alloy material as a material to be plated according to an embodiment of the present invention. FIG. 4 is a SEM cross-sectional photograph of an actual specimen of FIG. 3 according to Embodiment 5 of the present invention. FIG. 4 is a cross-sectional view showing a state in which chromate treatment is performed after zinc plating.

FIGS. 5A, 5B, 5C, and 5D are photographs of specimens subjected to the bending test, the X-cutting, and the hydraulic press in the adhesion test, showing no peeling of the plating layer. Referring to FIG. 6, FIGS. 7A and 7B show examples of a 2024-series and 6061-series aluminum alloy specimens subjected to zinc plating and chromate treatment, and then subjected to an adhesion test at the Korea Chemical Fusion Test Center And a photograph of the test report of the result, respectively.

In the above-described method of electro-galvanizing an aluminum alloy according to the present invention, the degreasing step (S10) as the first step is a step of removing a retained component adhering to the surface of aluminum and aluminum alloy material, It is a process of removing even the solid residue produced by the physical and chemical changes of the oxide film and aluminum and aluminum alloy surface.

It is observed that the degreasing process of the present invention is additionally accompanied by acid etching to homogenize the surface and to perform the primary surface adjustment while the general alkali degreasing process removes only the maintenance component.

In this case, it is preferable to use an aqueous solution containing sulfuric acid as the acidic solution. Specifically, 30 to 150 ml / L of sulfuric acid is added to pure water treated with an ion exchange resin, and after air cooling, sodium sulfate is added in an amount of 20 to 65 g / L, 0.1 to 5 wt.% Of polyacrylic acid as a corrosion inhibitor, 0.01 to 0.5 vol.% Of a phenol ethoxylate-based compound is added and dissolved. After that, the temperature is controlled at 40 to 60 占 폚 and immersion treatment is performed for 5 to 15 minutes.

Next, in the active step (S20) as the second step, secondary surface adjustment is performed by alkali etching in order to improve adhesion of the degreased aluminum and aluminum alloy material to the plating layer, In the degreasing step, the surface of the aluminum and aluminum alloy material is further activated by neutralizing the acidic substance on the product.

Here, the activating solution is prepared by dissolving and adding 20 to 100 g / l of sodium hydroxide to pure water, cooling at room temperature, adding 10 to 40 g / l of thioglycolate as a complexing agent and 0.1 to 1 g of a water-soluble polysaccharide compound wt. < / RTI > The temperature was controlled at 50 to 60 ° C and the immersion time was 10 to 60 seconds.

Next, the electro-galvanizing step (S30), which is the third step, is a final step of alkaline zincate-type non-cyanide galvanizing. The present invention relates to a chemical galvanizing process for zinc- .

The basic composition of zincate type zincate is sodium zinc metal and sodium hydroxide. The ratio of these basic compositions is in the range of NaOH: Zn = 8: 1 to 15: 1, and additives are included in consideration of the fineness of the plating crystal, the uniform electrodepositability, and the plating efficiency.

Specifically, it is preferable to add 10 to 30 g / l of a smoothing agent, 2 to 10 ml / l of a polishing agent and 0.1 to 1 ml / l of a nonionic surfactant to 12 to 20 g / l of zinc oxide, 120 to 150 g / The temperature of the plating solution is 20 to 40 캜 and the current density is 1 to 5 A / dm ² .

As the smoothing agent, a silicate compound and a urea compound were prepared and used. As a polishing agent, sodium pyrosulfonate and a polyamine compound were prepared and used. As the nonionic surfactant, an alkylphenol ethoxylate compound was used.

Hereinafter, the aluminum and aluminum alloy materials were electro-galvanized according to the embodiments described.

Specifically, the method of electro-galvanizing an aluminum alloy according to the present invention comprises the steps of immersing a plated material, which is an aluminum alloy, in an acidic degreasing liquid to form a natural oxide film on the surface of the material to be plated, A first step of preparing a first intermediate treatment material by cleansing and activating the surface of the material to be plated by dissolving and removing the holding component and simultaneously performing surface adjustment on the first surface; A second step of immersing the first intermediate treatment material in an alkaline activation liquid to remove an oxide film formed on the surface of the first intermediate treatment material and preparing a secondary intermediate treatment material which is secondarily surface-adjusted; And a third step of directly plating zinc on the surface of the secondary intermediate treatment material as a negative electrode in an alkaline zincate type zinc plating solution.

A method of electro-galvanizing an aluminum alloy according to a preferred embodiment of the present invention comprises the steps of immersing a plated material, which is an aluminum alloy, in an acidic degreasing liquid and attaching to the surface of the natural oxide film formed on the surface of the material to be plated and the surface of the natural oxide film A first step of preparing a first intermediate treatment material by cleaning and activating the surface of the material to be plated by firstly dissolving and removing the retaining component contained in the first intermediate treatment material; A second step of immersing the first intermediate treatment material in an alkaline activation liquid to remove an oxide film formed on the surface of the first intermediate treatment material and preparing a secondary intermediate treatment material which is secondarily surface-adjusted; And a third step of directly plating zinc on the surface of the secondary intermediate treatment material as a negative electrode in an alkaline zincate type zinc plating solution, the method comprising the steps of: The treatment material is a solution containing 30 to 100 ml / l of sulfuric acid (95%), 20 to 65 g / l of sodium sulfate, 0.1 to 5 wt.% Of polyacrylic acid and 0.01 to 0.5 vol.% Of alkylphenol ethoxylate And the immersion treatment time is controlled within the range of 5 to 15 minutes by using the aqueous solution constituted.
The primary intermediate treatment material may be an acidic treatment liquid containing 30 to 100 ml / l of sulfuric acid (95%), 20 to 65 g / l of sodium sulfate, 0.1 to 5 wt.% Of polyacrylic acid, 0.01 To 0.5 vol.%, And the immersion time was controlled within the range of 5 to 15 minutes.

In an embodiment of the present invention, the secondary intermediate treatment material is a treatment liquid containing 20 to 100 g / l of sodium hydroxide, 10 to 40 g / l of thioglycolate, 0.1 to 0.5 wt.% Of a water-soluble polysaccharide compound, And the immersion time was controlled within a range of 20 to 60 seconds.

In the third step, an alkaline zinc plating solution is used. The zinc plating solution includes 12 to 20 g / l of zinc oxide, 120 to 150 g / l of sodium hydroxide, 10 to 30 g / l of a smoothing agent, l, and 0.1 to 1 mℓ / l of a nonionic surfactant at a temperature of 20 to 40 ° C and a current density of 1 to 5 A / dm ² .

In the third step, the zinc-plated surface is further subjected to a chromate treatment after the step is completed.

In the third step, the aluminum alloy material (1) is coated with 30 to 150 ml / l of sulfuric acid, 20 to 65 g / l of sodium sulfate, 0.1 to 5 wt% of polyacrylic acid as an inhibitor, And a water-soluble polysaccharide compound as an inhibitor in an amount of 0.1 to 0.5 wt.%, As a surfactant, in an amount of 20 to 100 g / l of sodium hydroxide, 10 to 40 g / l of thioglycolate as a complexing agent, , 10 to 30 g / l of a smoothing agent, 2 to 10 mℓ / l of a brightening agent, 0.1 to 1 mℓ / l of a nonionic surfactant, 12 to 20 g / l of a zinc oxide and 120 to 150 g / galvanizing treatment was carried out by directly applying an electro-galvanizing treatment to the aluminum alloy material by providing an electro-galvanizing layer 2 for electroplating with an alkaline zinc-cyanate-type plating liquid.

Thus, the present invention has developed and applied a new process technology for electro-galvanizing an aluminum alloy material. As a result, in the process of complicated treatment and management in the conventional 16-step process, It has become possible to provide a treatment method of electro galvanizing an aluminum alloy material capable of shortening and shortening the ten steps of step (14).

Specifically, according to the embodiment of the present invention, the conventional long and complicated 16-step process of electroplating an aluminum alloy material has many complications such as generation of harmful substances and environmental pollutants, and complication of treatment and management. In order to solve such a problem and the necessity of shortening the process, the present invention is based on a number of experimental results

① Degreasing - ② Washing - 3 Active - 4 Washing - 5 Zinc plating - 6 Washing

(Three processes in the case of excluding the water washing process) greatly reduce the number of process, and the dismantling process, the first and second ginning process, and the aluminum alloy material without strike plating or electroless plating process steps The present invention provides an effect of providing a direct electro-galvanizing treatment method.

In particular, it has the effect of refining the chemical properties and functions of each sub-process, thereby avoiding chemical redundancy and developing, shortening, and purifying the existing process, which is a minimum process that emphasizes core functions.

Hereinafter, an experiment and a comparative example in which the process according to the preferred embodiment of the present invention is applied will be described.

(Treatment liquid composition in Experiments and Comparative Examples)

end. Alkaline degreasing solution (Preparation liquid 1-1, Macdermid)

A commercially available alkaline non-etching type degreasing agent was prepared and used.

TS40 = 50 g / l

I. Acidic degreasing solution (Preparation liquid example 1-2)

A degreasing solution consisting of 50 ml / l of sulfuric acid and 45 g / l of sodium sulfate as an acid solution and 0.5 vol.% Of alkyl phenol ethoxylate as a surfactant, 0.5 wt.% Of polyacrylic acid as an inhibitor, .

All. Active liquid

70 L of an activating solution consisting of 50 g / l of sodium hydroxide as an alkaline solution, 20 g / l of a thioglycolate as a complexing agent and 0.2 wt.% Of a water-soluble polysaccharide compound as an inhibitor was prepared in a pilot line.

la. Alkaline zinc amount

 80 liters of an alkaline zincate type zinc plating solution containing 12 g / l of metal zinc, 140 g / l of sodium hydroxide, 20 g / l of a smoothing agent, 5 mℓ / l of a polishing agent and 0.5 mℓ / l of a surfactant was prepared. The aluminum and aluminum alloy materials were plated as in the following examples using the above-mentioned cemented carbide, cemented carbide, and cemented carbide, and subjected to external inspection, bending test, X-cutting and adhesion test with 610-1PK tape of 3M Company.

hemp. Acid zinc amount (acidic 1 part, manufactured by ND Corporation)

240 g / l of zinc chloride, 250 g / l of ammonium chloride, 35 ml / l of additive N1, 2 ml / l of additive N2, and pH = 5.5 were prepared and used.

bar. Acid zinc amount (2 acidic acid, manufactured by ND Co., Ltd.)

130 g / l of zinc chloride, 200 g / l of potassium chloride, 25 g / l of boric acid,

25 mℓ / l, additive N4 1 ml / l, and pH = 5.5 were prepared and used.

[Experimental Example 1]

6061-type aluminum alloy plate specimen (75 mm x 255 mm, thickness: 1 mm) was immersed in an alkaline degreasing solution at 65 ° C for 5 minutes, washed with water, immersed in various active solutions at 60 ° C for 20 seconds, After performing the dismutting treatment (15 seconds) and the zincate treatment (40 seconds), the zinc plating solution was plated at a current density of 1 A / dm < ² > at room temperature for 35 minutes. The non-destructive X-ray plating thickness meter was used for the plating thickness. The average plating thickness was 11.9 μm, and excellent plating without abnormality was generated in the adhesion test.

[Experimental Example 2]

6061-type aluminum alloy plate specimen (75 mm x 255 mm, thickness: 1 mm), immersed in my acidic degreasing solution at 55 ° C for 7 minutes, rinsed in various active solutions at 55 ° C for 30 seconds, The plating solution was plated at a current density of 1 A / dm ² at room temperature for 40 minutes. The non-destructive X-ray plating thickness meter was used for the plating thickness, and the average plating thickness was 12.6 μm, and excellent plating without abnormality was generated in the adhesion test.

[Experimental Example 3]

2024-type aluminum alloy plate specimen (75 mm x 255 mm, thickness 0.5 mm), immersed in my acidic degreasing solution at 50 ° C for 5 minutes, washed with water, immersed in each of the active solutions at 50 ° C for 20 seconds, Zinc plating was carried out at a current density of 2A / dm < ² > at room temperature for 30 minutes. The non-destructive X-ray plating thickness meter was used for the plating thickness. The average plating thickness was 11.8 μm, and excellent plating without abnormality was produced in the adhesion test.

[Experimental Example 4]

60 ° C aluminum alloy pipe specimen 53 (length 235 mm, thickness 1.8 mm), immersed in my degreasing solution at 55 ° C for 10 minutes, rinsed in various active solutions at 55 ° C for 20 seconds, Galvanized at a current density of 2A / dm < ² > at room temperature for 45 minutes. The non-destructive X-ray plating thickness meter was used for the plating thickness, and the average plating thickness was 13.6 μm, and excellent plating without abnormality was generated in the adhesion test.

[Experimental Example 5]

60 ° C aluminum alloy pipe specimen 53 (length 235 mm, thickness 1.8 mm), immersed in my degreasing solution at 50 ° C for 7 minutes, washed with water, immersed in each of the active solutions at 50 ° C for 30 seconds, Galvanized at a current density of 2A / dm < ² > at room temperature for 45 minutes. The non-destructive X-ray plating thickness meter was used for the plating thickness, and the average plating thickness was 13.9 μm, and excellent plating without abnormality was produced in the adhesion test.

[Comparative Example 6]

The sample was immersed in my degreasing solution at 40 DEG C for 10 minutes using a 6063-type aluminum alloy pipe specimen (53, length 235mm, thickness 1.8mm), and then dipped in each of the multiple active solutions at 50 DEG C for 30 seconds. Zinc plating solution at a current density of 2A / dm < ² > at room temperature for 40 minutes. Plating thickness was measured by non-destructive X-ray plating thickness meter. The average plating thickness was 10.9 μm and the plating was peeled off in the adhesion test.

[Comparative Example 7]

60 ° C aluminum alloy pipe specimen 53 (length 235 mm, thickness 1.8 mm), immersed in my degreasing solution at 70 ° C for 5 minutes, rinsed in various active solutions at 60 ° C for 20 seconds, Zinc plating solution at a current density of 2A / dm < ² > at room temperature for 40 minutes. The plating thickness was measured by a non-destructive X-ray plating thickness meter. The average plating thickness was 11.7 μm, and the plating was peeled off in the adhesion test.

[Comparative Example 8]

60 ° C aluminum alloy pipe specimen 53 (length 235 mm, thickness 1.8 mm), immersed in my degreasing solution at 55 ° C for 7 minutes, washed with water, immersed in each of the multiple active solutions at 40 ° C for 30 seconds, Zinc plating solution at a current density of 2A / dm < ² > at room temperature for 40 minutes. The plating thickness was measured by a non-destructive X-ray plating thickness meter. The average plating thickness was 11.2 μm and the plating was peeled off in the adhesion test.

[Comparative Example 9]

Using a 6063-series aluminum alloy pipe specimen (53, length 235 mm, thickness 1.8 mm), the plate was immersed in my degreasing solution at 55 ° C for 5 minutes, washed with water, immersed in each of the active solutions at 60 ° C for 20 seconds, Zinc plating solution at a current density of 2A / dm < ² > at room temperature for 40 minutes. The non-destructive X-ray plating thickness meter was used as the plating thickness. The average plating thickness was 11.5 μm, and the plating was peeled off in the adhesion test.

[Comparative Example 10]

60 ° C aluminum alloy pipe specimen (53, length 235 mm, thickness 1.8 mm), immersed in my degreasing solution at 50 ° C for 10 minutes, rinsed in various active solutions at 55 ° C for 20 seconds, Zinc plating solution at a current density of 1.5 A / dm < ² > at room temperature for 20 minutes. However, the plating was peeled off in the adhesion test.

[Comparative Example 11]

Using a 6063-series aluminum alloy pipe specimen (53, length: 235 mm, thickness: 1.8 mm), the plate was immersed in my degreasing solution at 55 DEG C for 7 minutes and then washed with water at 55 DEG C for 20 seconds. And then plated at a current density of 3A / dm < ² > at room temperature for 20 minutes in an acidic zinc plating solution. However, the plating was peeled off in the adhesion test.

The results of the above experiments and comparative examples are summarized in Table 1 below.

[Summary of Experimental Example and Comparative Example Experiment] division Al
alloy   Degreasing process   Active process   Zinc plating process Adhesiveness   Defatted liquid Temperature,
℃ Hour, minute  Active liquid Temperature,
℃ Hours, seconds  Plating solution Hour, minute electric current
density,
A / m2 Experimental Example 1 6061 Production Example 1-1 65 5 Production Example 2 60 20 Alkaline 35   One ○ Experimental Example 2 6061 Production Example 1-2 55 7 Production Example 2 55 30 Alkaline 40   One ○ Experimental Example 3 2024 Production Example 1-2 50 5 Production Example 2 50 20 Alkaline 30   2 ○ Experimental Example 4 6063 Production Example 1-2 55 10 Production Example 2 55 20 Alkaline 45   2 ○ Experimental Example 5 6063 Production Example 1-2 50 7 Production Example 2 50 30 Alkaline 45   2 ○ Comparative Example 6 6063 Production Example 1-2 40 10 Production Example 2 50 30 Alkaline 40   2 × Comparative Example 7 6063 Production Example 1-2 70 5 Production Example 2 55 20 Alkaline 40   2 × Comparative Example 8 6063 Production Example 1-2 55 7 Production Example 2 40 30 Alkaline 40   2 × Comparative Example 9 6063 Production Example 1-2 55 5 Manufacturing 2 60 20 Alkaline 40   2 × Comparative Example 10 6063 Production Example 1-2 50 10 Production Example 2 55 20 Acid 1 20  1.5 × Comparative Example 11 6063 Production Example 1-2 55 7 Production Example 2 55 20 Acid 2 20   3 ×

In Table 1, " O "in the adhesion property indicates a satisfactory state in which no plating peeling phenomenon occurred in the bending test or the like, and" X "in the adhesion property indicates that plating peeling occurred in the bending test, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

1: Aluminum alloy material
2: Electro galvanized layer

Claims (7)

delete delete The surface of the plated material is immersed in an acidic degreasing solution to dissolve and remove the natural oxidation film formed on the surface of the plated material and the surface of the natural oxidation film, The first intermediate treatment material is immersed in an alkaline activation liquid to remove an oxide film which is formed again on the surface of the first intermediate treatment material and a second surface treatment A second step of producing a secondary intermediate treatment material, and a third step of directly plating zinc on the surface of the secondary intermediate treatment material as a negative electrode in an alkaline zincate type zinc salt solution, A method of electroplating a zinc plating product,
Wherein the first intermediate treatment material comprises 30 to 100 mℓ / liter of sulfuric acid (95%), 20 to 65 g / liter of sodium sulfate, 0.1 to 5 wt.% Of polyacrylic acid, 0.01 to 0.5 Vol.%, And the immersion treatment time is controlled within a range of 5 to 15 minutes. The secondary intermediate treatment material according to claim 3, wherein the secondary intermediate treatment material comprises 20 to 100 g / l sodium hydroxide, 10 to 40 g / l thioglycolate, and 0.1 to 0.5 wt% water-soluble polysaccharide compound as the alkaline treatment liquid Wherein the immersion treatment time is controlled within a range of 20 to 60 seconds by using an aqueous solution. delete delete 4. The method according to claim 3, wherein the third step is a step in which the aluminum alloy material (1) is coated with 30 to 150 ml / l of sulfuric acid, 20 to 65 g / l of sodium sulfate, 0.1 to 5 wt.% Of polyacrylic acid as an inhibitor A water-soluble polysaccharide compound as an inhibitor, 0.1 to 0.5 g / l as an inhibitor, 20 to 100 g / l of a sodium hydroxide solution and a thioglycolate salt as a complexing agent in an amount of 0.01 to 0.5% and 10 to 30 g / l of a smoothing agent, 2 to 10 mℓ / l of a polishing agent, 0.1 to 0.1 g / l of a nonionic surfactant, 0.1 to 10 g / l of a zinc oxide, 12 to 20 g / And an electrolytic galvanizing layer (2) for plating with an alkaline cyanate zincate type plating liquid containing 1 to 1 mℓ / l of zinc oxide, characterized in that the zinc electroplating is performed directly on the aluminum alloy material, Processing method.

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