KR101754773B1 - Method for Treating the Surface of Front End Module Carrier of Vehicles - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment method of a front end module carrier of a vehicle, and more particularly, to a method of treating a surface of a front end module carrier of a vehicle using a Ba (OH) ₂ aqueous solution as a magnesium oxide front end module carrier, The present invention relates to a surface treatment method for a front-end module carrier of a vehicle.
According to an aspect of the present invention, there is provided a vehicular front end module comprising: a degreasing step of degreasing a front end module carrier of a vehicle; An etch step wherein the degreased front end module carrier is etched; An activation step in which the etched front end module carrier is activated; A coating step in which the activated front end module carrier is coated with plasma electrolytic oxidation; A sealing step wherein the coated front end module carrier is sealed; And a drying step in which the sealed front end module carrier is dried. The present invention also provides a surface treatment method of a front end module carrier of a vehicle.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of treating a front end module carrier of a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment method of a front end module carrier of a vehicle, and more particularly, to a method of treating a surface of a front end module carrier of a vehicle using a Ba (OH) ₂ aqueous solution as a magnesium oxide front end module carrier, The present invention relates to a surface treatment method for a front-end module carrier of a vehicle.

Recently, as the problem of environmental pollution emerges as the most important problem all over the world, all industries are trying to solve this problem in order to reduce environmental pollutants. In particular, the problem caused by global warming is serious because of the carbon dioxide emitted by automobile exhaust gas. Accordingly, the automotive industry in particular has proposed solutions in various ways to reduce CO ₂ emissions.

As a representative method, there is a method of increasing the mileage of the vehicle per liter by increasing the mileage of the vehicle, and a method of reducing the weight of the parts of the vehicle. However, when the weight of the vehicle parts is reduced, the rigidity and durability of the vehicle parts are lowered, which causes a problem in the safety of the passengers on the vehicle. Therefore, it is a great concern of the automobile industry to solve the above problems .

One of the ways to solve the above problem is to substitute heavy-weight iron-based material applied to a vehicle with low-density magnesium. As a result of such a material change, there is a problem that magnesium-applied parts are more easily corroded and less in mechanical properties as compared with parts made of iron-based materials.

In order to solve the above-mentioned problems, the prior art has solved the problem of coating an oxide film on the magnesium surface, but the electrolytic solution used in the prior art must be applied with a high voltage, and the thickness of the oxide film is not sufficiently thick, .

SUMMARY OF THE INVENTION The present invention provides a method of treating a surface of a front end module carrier of a vehicle.

It is an object of the present invention to provide a method for surface treatment of a front end module carrier of a vehicle that not only satisfies durability but also improves the thickness of an oxidation film.

Further, the present invention provides a method for surface treatment of a front-end module carrier of a vehicle that simplifies the manufacturing method and reduces the manufacturing cost by replacing the formation of the oxide film by the high voltage in the manufacturing process with the oxide film using the low voltage. There is a purpose.

The technical objects to be achieved by the present invention are not limited to the technical matters mentioned above, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the description of the present invention .

According to an aspect of the present invention, there is provided a vehicular front end module comprising: a degreasing step of degreasing a front end module carrier of a vehicle; An etch step wherein the degreased front end module carrier is etched; An activation step in which the etched front end module carrier is activated; A coating step in which the activated front end module carrier is coated with plasma electrolytic oxidation; A sealing step wherein the coated front end module carrier is sealed; And a drying step in which the sealed front end module carrier is dried. The present invention also provides a surface treatment method of a front end module carrier of a vehicle.

In the present invention, the front end module carrier of the vehicle is preferably made of magnesium.

In the present invention, it is preferable that an aqueous solution of Na ₃ PO ₄ having a concentration of 25 to 35 g / l is used for the degreasing step.

In the present invention, it is preferable that the degreasing step is performed at a current density of 1 to 4 A / dm 2 and at a voltage of 4 to 6 V for 0.5 to 3 minutes.

In the present invention, it is preferable that the etching step uses an aqueous CrO ₃ solution of 175 to 185 g / l.

In the present invention, it is preferable that the etching step is performed at a temperature of 20 to 30 DEG C for 2.5 to 3.5 minutes.

In the present invention, it is preferable to use an aqueous KOH solution having an activation rate of 2 to 4 g / l.

In the present invention, it is preferable that the activation step is performed at a temperature of 20 to 30 DEG C for 1.5 to 2.5 minutes.

In the present invention, it is preferable that an aqueous solution of Ba (OH) ₂ having a concentration of 10 to 15 g / l is used as the coating step.

In the present invention, the coating step may be carried out in an aqueous solution of at least one of an aqueous solution of Na ₂ SiO ₃ .9H ₂ O at 10 to 15 g / l, a NaF 2H ₂ O aqueous solution at 3 to 5 g / l or a KOH aqueous solution at 2 to 4 g / It is preferable to use it further.

In the present invention, it is preferable that a voltage of 30 to 50 V is applied to the coating step at a temperature of 45 to 55 DEG C for 1 to 5 minutes.

In the present invention, it is preferable that 100 to 150 g of CO ₂ is dissolved in the coating step.

In the present invention, it is preferable that the sealing step uses 3 to 5 g / l of nickel nitrate.

In the present invention, it is preferable that the sealing step is performed at a temperature of 20 to 30 DEG C for 1 to 5 minutes.

In the present invention, it is preferable that the drying step is performed at a temperature of 80 to 100 ° C for 10 to 20 minutes.

Further, according to the present invention for solving the above-mentioned problems of the prior art, a coating step comprising a Ba (OH) ₂ aqueous solution in a coating step of a surface treatment method of a front end module carrier of the vehicle, .

In the present invention, the Ba (OH) ₂ aqueous solution is preferably 10 to 15 g / l.

In the present invention, it is preferable to further include at least one aqueous solution of Na ₂ SiO ₃ .9H ₂ O aqueous solution, NaF ₂ H ₂ O aqueous solution or KOH aqueous solution.

In the present invention, from 10 to 15g / l of Na ₂ SiO ₃ · 9H ₂ O aqueous solution, 3 to 5g / l of NaF · 2H ₂ O aqueous solution, or from 2 to 4g / l of further comprising at least one aqueous solution of KOH solution .

According to another aspect of the present invention, there is provided a method for surface treatment of a front end module carrier of a vehicle, the method comprising the steps of: Thereby providing a front end module carrier of the configured vehicle.

According to the surface treatment method of the front end module carrier of the vehicle of the present invention, there is an effect of providing a surface treatment method that not only satisfies the durability of the surface of the front end module of the vehicle but also improves the thickness of the oxidation film.

Further, according to the surface treatment method of the front end module carrier of the vehicle of the present invention, the oxide film formation by the high voltage in the manufacturing process can be replaced with the oxide film using the low voltage, thereby simplifying the manufacturing method and reducing the manufacturing cost. There is an effect of providing a method.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram of a front end module carrier of a vehicle.
Fig. 2 is a graph showing the amount of BaCO3 according to the amount of dissolved CO2 in a BaOH2 aqueous solution of 10 to 15 g / l. Fig.
3 is a flow diagram illustrating a method of surface treatment of a front end module carrier of a vehicle in accordance with an embodiment of the present invention.
Figure 4 is an enlarged view of the surface of the front end module carrier of the vehicle in accordance with the prior art;
5 is an enlarged view of the surface of a front end module carrier of a vehicle in accordance with an embodiment of the present invention.
6 is a photograph showing a surface of a magnesium surface subjected to surface treatment according to a conventional technique after 600 hours of spraying with salt water.
FIG. 7 is a photograph showing a surface of a magnesium surface which has been subjected to surface treatment according to an embodiment of the present invention after 600 hours have elapsed after spraying salt water. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and provides a method for surface treatment of a front end module carrier of a vehicle. A front end module (FEM) refers to a configuration in which a plurality of parts on the front surface of a vehicle are formed as one module, and a front end module carrier is a skeleton of the front end module. The front end module generally comprises a carrier, a head lamp, a radiator assembly, a front bumper beam, and other components, and in some cases, a front bumper assembly. In the prior art, although the front end module carrier is made of steel, magnesium has been used to lighten the vehicle. Table 1 below is a table showing some of the features of manufacturing the front end module carrier of the prior art and the present invention.

division Conventional technology Invention Material of the front-end module carrier Steel + plastic magnesium Manufacture process Insert injection Gravity casting Whether surface treatment is required none has exist

As shown in Table 1, the front end module carrier of the prior art is made of steel and plastic while the present invention is made of magnesium material. Also, while the prior art front end module carrier was manufactured by insert injection, the present invention was manufactured by gravity casting. However, when a front end module carrier of a vehicle is applied with a magnesium material, there is a problem of insufficient corrosion resistance as well as durability, so that a front end module carrier made of a magnesium material has a need to treat the surface. The present invention relates to a surface treatment method of a front end module carrier for solving the above problems.

In the prior art, there are many cases in which an oxide film is coated on the surface of the magnesium material in consideration of the adhesion with the base material. Especially, Plasma Electrolytic Oxidation (PEO) method has been widely applied in which electricity is applied at high voltage (70V ~ 200V) to generate plasma and an oxide film is formed on the surface of magnesium. The present invention is characterized in that an oxide film is formed even at a low voltage (30-50 V), that is, an anodic oxidation is performed with an electrolyte solution component made of an element having a high ionization degree to form an oxide film on the surface of the magnesium material. Therefore, among the elements having a high degree of ionization, it is necessary to find an element that easily reacts with the magnesium material.

In the prior art, NaOH, KOH, and the like among the elements having a high degree of ionization have been widely used. However, BaOH ₂ having good ionization is not only poisonous but also reacts with carbon dioxide in the atmosphere to form barium carbonate, that is, BaCO ₃ , as shown in the following formula (1) to make the electrolyte cloudy and insoluble, Respectively.

[Chemical Formula 1]

BaOH ₂ + CO _{2 -} > BaCO ₃ + H ₂ O

However, in order to overcome the above-mentioned limitations, the present invention has led to the following reaction formula (2) by adding an excess amount of carbon dioxide to BaCO _{3 -} (barium carbonate).

(2)

BaCO ₃ + 2CO ₂ + H ₂ O → Ba (HCO ₃ ) ₂

The reaction is carried out in the same manner as in the above formula (2) to convert the water-soluble material soluble in the solution to Ba (HCO ₃ ) ₂ (barium hydrogencarbonate) in a solution in which CO ₂ is dissolved. Therefore, excessive dissolution of CO ₂ in BaCO ₃ , which is not soluble in an aqueous solution, forms Ba (HCO ₃ ) ₂ dissolved in an aqueous solution, thereby enabling coating by plasma electrolytic oxidation.

Moreover, the table of the following two is from 10 to 15g / l of BaOH are shown the amount of BaCO ₃ according to the amount of dissolved CO ₂ in the _second aqueous solution of the table, Figure 2 is from 10 to 15g / l of BaOH CO ₂ in the _second aqueous solution The amount of BaCO ₃ produced according to the amount of dissolved BaCO ₃ .

The amount of dissolved CO ₂ (g) 0 30 50 90 95 100 130 150 160 165 190 The amount (g) of BaCO ₃ produced 20 20 15 5 3 0 0 0 5 5 15

Referring to Table 2 and FIG. 2, it can be seen that the amount of BaCO ₃ is 0 g as the reaction of Formula 2 is maximized. In more detail Referring to, increasing the amount of CO ₂ dissolved in the BaOH2 while the generated amount of BaCO ₃ is decreased while BaOH amount of 10 times or more that the volume moment Ba (HCO _{3) 2 2} Up BaCO ₃ The amount becomes 0g. As the amount of dissolved CO ₂ increases, the amount of BaCO ₃ increases again.

A surface treatment method of the front end module carrier of the vehicle of the present invention is as follows. Degreasing step S101; Etching step S103; Activation step S105; Coating step S107; Sealing step S109; And a drying step (S111). 3 is a flowchart showing a surface treatment method of a front end module carrier 1 of a vehicle according to an embodiment of the present invention. After the degreasing step (S101) for degreasing the front end module carrier made of the magnesium material, an etching step (S103) for etching the front end module carrier of the degreased vehicle is performed. Thereafter, after the activation step S105 of activating the front end module carrier of the etched vehicle, a coating step (S107) of coating the front end module carrier of the activated vehicle with the plasma electrolytic oxidation method is performed. Thereafter, after a sealing step (S109) for sealing the front end module carrier of the coated vehicle, a drying step (S111) for drying the front end module carrier of the sealed vehicle is performed.

More particularly, the present invention relates to a method for surface treatment of a front end module carrier of a vehicle, comprising: a degreasing step of degreasing a front end module carrier of the vehicle; An etch step wherein the degreased front end module carrier is etched; An activation step in which the etched front end module carrier is activated; A coating step in which the activated front end module carrier is coated with plasma electrolytic oxidation; A sealing step wherein the coated front end module carrier is sealed; And a drying step in which the sealed front end module carrier is dried. The present invention also provides a surface treatment method of a front end module carrier of a vehicle. Preferably, the front end module carrier of the vehicle is made of magnesium, and the degreasing step is preferably performed using an aqueous solution of Na ₃ PO _{4 in an amount} of 25 to 35 g / l. Further, it is preferable that the degreasing step is performed at a current density of 1 to 4 A / dm 2 and a cathode is degreased at a voltage of 4 to 6 V for 0.5 to 3 minutes, and the etching step is carried out by using an aqueous solution of CrO ₃ of 175 to 185 g / . Also, it is preferable that the etching step is performed at a temperature of 20 to 30 ° C for 2.5 to 3.5 minutes, and the KOH aqueous solution having an activation rate of 2 to 4 g / l is preferably used. In addition, the activation step is preferably performed at a temperature of 20 to 30 ° C for 1.5 to 2.5 minutes, and the coating step is preferably an aqueous solution of Ba (OH) ₂ of 10 to 15 g / l. Additionally, the coating step is 10 to 15g / l of Na ₂ SiO ₃ · 9H further comprises ₂ O aqueous solution, 3 to 5g / l of NaF · 2H ₂ O aqueous solution or 2 to at least one aqueous solution of 4g / l of KOH solution Preferably, the coating step is performed at a temperature of 45 to 55 DEG C for 1 to 5 minutes, and a voltage of 30 to 50 V is applied. Furthermore, it is preferable that the coating step is performed by dissolving 100 to 150 g of CO ₂ , and the sealing step is preferably carried out using 3 to 5 g / l of nickel nitrate. In addition, the sealing step is preferably performed at a temperature of 20 to 30 ° C for 1 to 5 minutes, and the drying step is preferably performed at a temperature of 80 to 100 ° C for 10 to 20 minutes.

According to another aspect of the present invention, there is provided a method for surface treatment of a front end module carrier of a vehicle, which comprises a Ba (OH) ₂ aqueous solution in a coating step. In the present invention, it is preferable that the Ba (OH) ₂ aqueous solution is 10 to 15 g / l. In the present invention, at least one of Na ₂ SiO ₃ .9H ₂ O aqueous solution, NaF ₂ H ₂ O aqueous solution or KOH aqueous solution It is preferable to further include an aqueous solution. Further, in the present invention, further from 10 to 15g / l of Na ₂ SiO ₃ · 9H ₂ O aqueous solution, 3 to 5g / l of NaF · 2H ₂ O aqueous solution, or from 2 to 4g / l of one or more aqueous solutions of KOH solution .

In the prior art, when an aqueous solution of Ba (OH) ₂ is used as an electrolytic solution, there is a problem that it is toxic and carbon dioxide in the air melts to form crystals and is not applicable to the present manufacturing method. However, the aqueous solution of Ba (OH) ₂ of the present invention is converted into a solution of Ba (HCO ₃ ) ₂ (barium hydrogencarbonate), which is a water-soluble substance which can be dissolved in water again by adding an excess amount of carbon dioxide. As a result, the surface treatment method of the front end module carrier of the vehicle of the present invention described above can be applied by using the Ba (OH) ₂ aqueous solution.

Further, in another aspect of the present invention, a front end module of a vehicle is manufactured by a method of surface treatment of a carrier, and the thickness of the oxide coating is 10 to 20 μm. Carrier. The prior art has a problem that it is difficult to grow the oxide film to a thickness of 10 탆 or more, and also the oxide film is easily broken and thicker as the oxide film becomes thicker, failing to have corrosion resistance. According to the front end module carrier of the vehicle constructed of the magnesium material of the present invention, the thickness of the oxide film is 10 to 20 占 퐉, which is excellent in corrosion resistance and durability.

[Example]

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and that the scope of the present invention is not construed as being limited by these embodiments.

step Composition of aqueous solution Condition Degreasing step (S101) 30g / l Na ₃ PO ₄
0.5 to 3 minutes Cathode degreasing,
Current density of 1 to 4 A / dm,
Voltage 4 ~ 6V In the etching step S103, 180g / l CrO ₃ Immersion for 3 minutes at 20 ~ 30 ℃ Activation step (S105) 2 to 4 g / l KOH Immersion for 2 minutes at 20 ~ 30 ℃ Coating step (S107) _{10 ~ 15g / l Na 2 SiO} 3 · 9H 2 O
3 to 5 g / l NaF 2H ₂ O
1 to 3 g / l KOH
10 to 15 g / l Ba (OH) 2 Apply a voltage of 30 ~ 50V for 1 ~ 5 minutes at 50 ℃.
Dissolving CO ₂
Sealing step (S109) 3 to 5 g / l nickel Immersion for 1 to 5 minutes at 20 to 30 ° C In the drying step (S111) Maintain at 80 ~ 100 ℃ for 10 ~ 20 minutes

Table 3 is a table showing the composition and condition of the electrolytic solution in the surface treatment method of the front end module carrier of a vehicle made of magnesium material according to an embodiment of the present invention. Specifically, in the degreasing step (S101), Na ₃ PO ₄ aqueous solution having a concentration of 30 g / l was used and the anode was degreased at a current density of 1 to 4 A / dm and a voltage of 4 to 6 V for 0.5 to 3 minutes. In the etching step (S103) after the degreasing reaction progressed, the substrate was immersed in a CrO ₃ aqueous solution of 180 g / l at a temperature of 20 to 30 ° C for 2.5 to 3.5 minutes. After the etching step, the activation step (S105) is carried out using a KOH aqueous solution of 2 to 4 g / l at a temperature of 20 to 30 ° C for 1.5 to 2.5 minutes. The subsequent activation stage coating step (S107) from 10 to 15 g / l of Ba (OH) ₂ aqueous solution, 10 to 15g / l of Na ₂ SiO ₃ · 9H ₂ O aqueous solution, 3 to 5g / l of NaF · 2H ₂ O solution and 2 to 4 g / l of KOH aqueous solution was used to dissolve 100 to 150 g of CO ₂ in the aqueous solution and a voltage of 30 to 50 V was applied at a temperature of 50 ° C for 1 to 5 minutes to perform a plasma electrolytic oxidation . ≪ / RTI > After the coating step, the sealing step (S109) is carried out at a temperature of 20 to 30 占 폚 for 1 to 5 minutes by using nickel platinum of 3 to 5 g / l. After the sealing step, the drying step (S111) was dried at a temperature of 80 to 100 DEG C for 10 to 20 minutes.

Fig. 4 is an enlarged view of the surface of the front end module carrier of the vehicle according to the prior art, and Fig. 5 is an enlarged view of the surface of the front end module carrier of the vehicle according to an embodiment of the present invention. 4 shows that the thickness of the oxide film on the surface is 5 m. In contrast, the surface of the front end module carrier of the vehicle of the present invention has an oxide film thickness of 17 탆. As a result of the increase of the oxidation film as described above, it is confirmed that not only the durability but also the corrosion resistance are improved.

FIG. 6 is a photograph showing a surface of a magnesium surface subjected to a surface treatment according to the prior art 600 hours after spraying with salt water. Fig. 2 is a photograph showing one surface. In order to compare the corrosion resistance of the present invention with that of the prior art, the surface after 600 hours of spraying with brine was confirmed. It can be confirmed that the surface is corroded as shown in FIG. However, according to the present invention, 600 hours after spraying the surface with salted water, it can be confirmed that there is no significant difference between before spraying the salt water and after spraying the saline water.

The present invention is advantageous in that corrosion resistance and durability are maximized by coating with a plasma electrolytic oxidation method including an electrolytic solution such as BaOH ₂ aqueous solution, and manufacturing cost is reduced by using low voltage.

Although the present invention has been described in connection with the specific embodiments of the present invention, it is to be understood that the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Various modifications and variations are possible.

1: Car front-end module carrier
S101: degreasing step
S103: etching step
S105: Activation step
S107: coating step
S109: Sealing step
S111: drying step

Claims (20)

A degreasing step of degreasing the front end module carrier of the vehicle;
An etch step wherein the degreased front end module carrier is etched;
An activation step in which the etched front end module carrier is activated;
A coating step in which the activated front end module carrier is coated with plasma electrolytic oxidation;
A sealing step wherein the coated front end module carrier is sealed; And
And a drying step wherein the sealed front end module carrier is dried,
Wherein the coating step is performed using an aqueous Ba (OH) ₂ solution.
The method according to claim 1,
Wherein the front end module carrier of the vehicle is made of magnesium.
The method according to claim 1,
Wherein the degreasing step uses an aqueous solution of Na ₃ PO _{4 in an amount} of 25 to 35 g / l.
The method according to claim 1,
Wherein the degreasing step comprises degreasing the cathode at a current density of 1 to 4 A / dm and a voltage of 4 to 6 V for 0.5 to 3 minutes.
The method according to claim 1,
Wherein the etching step uses an aqueous CrO ₃ solution having a weight of 175 to 185 g / l.
The method according to claim 1,
Wherein the etching step is carried out at a temperature of 20 to 30 DEG C for 2.5 to 3.5 minutes.
The method according to claim 1,
Wherein the activating step uses a KOH aqueous solution of 2 to 4 g / l. ≪ RTI ID = 0.0 > 11. < / RTI >
The method according to claim 1,
Wherein the activating step is carried out at a temperature of 20 to 30 DEG C for 1.5 to 2.5 minutes.
The method according to claim 1,
Wherein the coating step uses a Ba (OH) ₂ aqueous solution of 10 to 15 g / l.
10. The method of claim 9,
The coating step is used contains more than 10 to 15g / l of Na ₂ SiO ₃ · 9H ₂ O aqueous solution, 3 to 5g / l of NaF · 2H ₂ O aqueous solution or 2 to at least one aqueous solution of 4g / l of KOH solution Of the front end module carrier.
The method according to claim 1,
Wherein the coating step is performed by applying a voltage of 30 to 50 V for 1 to 5 minutes at a temperature of 45 to 55 占 폚.
10. The method of claim 9,
Wherein the coating step comprises dissolving 100 to 150 grams of CO ₂ .
The method according to claim 1,
Lt; RTI ID = 0.0 > g / l < / RTI > is used.
The method according to claim 1,
Wherein the sealing step is performed at a temperature of 20 to 30 DEG C for 1 to 5 minutes.
The method according to claim 1,
Wherein the drying step is performed at a temperature of 80 to 100 DEG C for 10 to 20 minutes.
A method of coating a front end module carrier of a vehicle according to claim 1,
Ba (OH) ₂ aqueous solution.
17. The method of claim 16,
Wherein the Ba (OH) ₂ aqueous solution is 10 to 15 g / l.
17. The method of claim 16,
An aqueous solution of Na ₂ SiO ₃揃 9H ₂ O, an aqueous solution of NaF 揃 2H ₂ O, or an aqueous solution of KOH.
18. The method of claim 17,
Characterized in that it further comprises an aqueous solution of at least one of an aqueous Na ₂ SiO ₃ .9H ₂ O solution of from 10 to 15 g / l, an aqueous NaF 2H ₂ O 3 to 5 g / l aqueous solution or a KOH aqueous solution of 2 to 4 g / l Step Electrolyte.
A front end module carrier of a vehicle, made of a magnesium material, which is manufactured by a method of surface treatment of a front end module carrier of a vehicle according to any one of claims 1 to 15, characterized in that the thickness of the oxide coating is 10 to 20 μm .

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