KR101676246B1

KR101676246B1 - The Materials of Auxiliary Anode using Trivalent Chromium Plating and The method of Plating used by Auxiliary Anode

Info

Publication number: KR101676246B1
Application number: KR1020150055465A
Authority: KR
Inventors: 송주승; 이광우
Original assignee: 현대자동차주식회사; 이광우
Priority date: 2015-04-20
Filing date: 2015-04-20
Publication date: 2016-11-30
Also published as: KR20160124996A

Abstract

The present invention relates to an auxiliary anode material for automotive wheels to which trivalent chrome plating is applied, comprising: a plurality of spoke auxiliary anodes radially coupled between an outer circular plate and an inner circular plate disposed at a central portion thereof; A plurality of first pipe rings coupled to one side of the spoke auxiliary anode and being in contact with the outer circular plate; A plurality of second pipe rings coupled to the other side of the spoke auxiliary anode and in contact with the inner circular plate; A support bar coupled to the inner circular plate and having a lug hole insertion portion protruding therefrom; And a graphite rod inserted into the first pipe ring and the second pipe ring so as to be perpendicular to the outer circular plate and the inner circular plate, respectively. The outer auxiliary anode for an automobile wheel to which the trivalent chrome plating is applied, And a lug hole fixing part formed on the front surface of the lug hole insertion part; A plurality of brackets coupled along a front surface of the outer circular plate; A plurality of graphite rods coupled to the bracket so as to be parallel to the outer circular plate; And a power connection lead connected to a rear surface of the lug hole fixing portion for applying a high current to the spark auxiliary anodes and the graphite rods. The present invention relates to an inner auxiliary anode for an automobile wheel applying trivalent chromium plating, To an auxiliary anode material for an automobile wheel to which chromium plating is applied to improve the conductivity, reduce the formation of an oxide film, maintain a constant current density, and prevent the plating material itself from being contaminated by dissolution of the iron material.

Description

TECHNICAL FIELD [0001] The present invention relates to an auxiliary anode material and a plating method for forming an automobile wheel using trivalent chromium plating,

The present invention relates to an auxiliary anode material for realizing a trivalent chromium plating applied to an automobile wheel, and more particularly, to a material for an auxiliary anode which improves conductivity, decreases the formation of an oxide film, maintains a constant current density, To the material of the auxiliary anode preventing contamination.

Electroplating is a technique of coating the surface of a conductor surface with a metal thin film (thin film) by precipitation resulting from electrolysis. Using an electrolytic solution (plating solution) containing metal ions to be plated, (Positive polarity) or an insoluble positive electrode such as platinum is used for the positive electrode and a positive potential difference is applied between the positive electrode and the negative electrode by connecting a direct current power source to the positive electrode and the metal ion (positive ion) Is a surface treatment technique which causes a metal to precipitate to form a plated film.

In recent years, such electroplating techniques have been extensively used for the purpose of aesthetically decorating the objects to be painted, strengthening the abrasion resistance, or preventing corrosion. Generally, the metals used for electroplating generally include silver, gold, copper, nickel, etc., which have low ionization tendency and low reactivity.

Compared with the above-mentioned metal plating, chrome plating has a good appearance and has excellent durability as compared with paint, and is applied to various automobile parts for decorative purpose and durability. In particular, chrome plating, which is used for exterior decoration of objects, is plated with metal such as copper or nickel on the material of the object, and chrome is plated finally to achieve both aesthetic beauty and luxurious metal texture.

However, among the various parts to which chrome plating is applied, especially aluminum wheel is made by casting method, the size and depth of wheel are not constant, so it is very difficult to uniformly coat the surface of wheel.

In order to solve such a problem, in the case of an automobile wheel using 6-chrome plating of the prior art, each plating layer is realized by using a dedicated auxiliary anode according to the amount of plating of each plating layer (nickel, chromium). In the case of the nickel plated layer, it was possible to prevent the contamination of the plating solution and to secure the conductivity by using the auxiliary anode composed of the titanium round plate and the iridium-coated titanium rod. In addition, due to the high melting point (1800 ° C) of titanium dioxide and the high corrosion resistance of iridium used for high current, the rate of formation of the oxide film was remarkably low, which enabled long-term use.

In the case of hexavalent chromium plating as the prior art, when the contamination degree of the plating liquid is 5% or less of the chromium exclusive use amount, it does not act as a contaminant and is insensitive to the contamination of the anodic oxide rather than nickel plating. Therefore, when chromium plating is performed, iron having lower conductivity and higher conductivity than titanium can be used as the auxiliary anode. Chromium plating was used for the inner and outer surfaces of the wheel because the thickness of the chrome plating layer was not plated for a long time compared with the nickel plating. In addition, the inner auxiliary anode which does not require uniform plating has a simple structure by a circular wire, and the high current and low current portion according to the design of the wheel. The auxiliary anode of various outer surfaces is formed by joining (welding, etc.) .

However, in the case of hexavalent chromium plating, after the plating of 400 to 500 wheels due to the high oxidation rate of iron, the anode is shortened to be used. The same process can be applied up to the nickel plating step in the conventional process of manufacturing the wheel with the 3-valent dark chrome plating, but since the chromium plating has a very narrow tolerance range of the plating solution (90 ppm of iron, 40 ppm of nickel and 3 ppm of zinc) It was difficult to apply the auxiliary anode which was applied to the hexavalent chromium plating due to the contamination problem of the plating liquid caused by dissolution of the iron material.

In addition, the use of trivalent chromium plating with a conventional titanium bipolar plate and an iridium-coated titanium bipolar plate applied to nickel plating was limited for the following reasons.

Titanium is light in weight, high in rigidity and excellent in corrosion resistance, but in electroplating, there is a problem that when an electric current is applied to other metals, an oxide film is continuously formed and becomes non-conductive. Therefore, when electroplating is performed to solve the above problem, it is effective that the current density is 5 mV or less. For this reason, the same material was applied to the anode rod. However, in case of electroplating, the rate of formation of the trivalent chromium plating layer is slower than that of nickel plating or hexavalent chromium plating. Therefore, in order to obtain a plating thickness sufficient to ensure proper quality within a limited time, the current density should be set to 8 mV or more It is necessary. In practice, when trivalent chromium plating is applied, it is applied at 8 mV or more. However, there is a problem that the oxide film is continuously formed and becomes non-derivatized.

In addition, if a sufficient current density can not be secured for each part of the vehicle wheel, the thickness of the plating may be insufficient, or the surface of the wheel may be unevenly smudged. Therefore, there is a problem in that the plating thickness or the uniform plating surface can not be obtained when the conventional titanium anode round plate and the iridium-coated titanium anode rod are used as the auxiliary anode and applied to the trivalent chromium plating.

Further, as described above, the auxiliary anode made of iron used for the conventional hexavalent chromium plating has a problem that the iron material is dissolved and the plating liquid itself is contaminated. As a result, there is a problem in that it is not suitable for the use of trivalent chromium which is sensitive to contaminants.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art described above, and it is an object of the present invention to improve the conductivity of the auxiliary anode, reduce the formation of the oxide film of the anode bar in the auxiliary anode, And it is an object of the present invention to provide a material which maintains the density and prevents the iron material from dissolving and thereby causing contamination of the plating liquid itself.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, 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 .

In order to solve the problems of the prior art described above, the present invention provides a spark-assisted secondary battery comprising: a plurality of spoke auxiliary anodes coupled radially between an outer circular plate and an inner circular plate disposed at a central portion thereof; A plurality of first pipe rings coupled to one side of the spoke auxiliary anode and being in contact with the outer circular plate; A plurality of second pipe rings coupled to the other side of the spoke auxiliary anode and in contact with the inner circular plate; A support bar coupled to the inner circular plate and having a lug hole insertion portion protruding therefrom; And a plurality of graphite rods respectively inserted into the first pipe ring and the second pipe ring so as to be perpendicular to the outer circular plate and the inner circular plate. .

Further, in the present invention, it is preferable to further include a bolt inserted into the side of the first and second pipe rings for fixing the graphite rod.

Further, in the present invention, it is preferable that the outer circular plate, the inner circular plate, the spoke auxiliary anode, the first pipe ring, the second pipe ring, the lug hole insertion portion, the support and the bolt are made of titanium.

According to another aspect of the present invention, there is provided a lug hole fixing device, comprising: a lug hole fixing part coupled to an outer circular plate and having a lug hole insertion part protruding from a front surface thereof; A plurality of brackets coupled along a front surface of the outer circular plate; A plurality of graphite rods coupled to the bracket so as to be parallel to the outer circular plate; And a power connection lead connected to the rear surface of the lug hole fixing part for applying a high current to the spoke auxiliary anode and the graphite rods. to provide.

In the present invention, it is preferable that the bracket is Y-shaped.

In addition, in the present invention, it is preferable that the outer circular plate, the lug hole insertion portion, the lug hole fixing portion, the bracket, and the power connection lead are made of titanium.

Further, in the present invention, it is preferable that an outer auxiliary anode for forming the automobile wheel is provided on the outer surface of the wheel, and an inner auxiliary anode for forming the automobile wheel is provided on the inner surface.

In addition, the present invention provides a method of plating an automotive wheel with trivalent chromium by using an auxiliary anode for forming an automobile wheel to which the trivalent chromium plating is applied.

According to the auxiliary anode material for forming the automobile wheel to which the trivalent chromium plating of the present invention is applied, the graphite anode rod of the present invention is put in a place where the current density is low in manufacturing the automobile wheel, It is possible to reduce the formation of an oxide film by using graphite, maintain a constant current density, and solve the problem that the iron material is dissolved and the plating liquid itself is contaminated.

The present invention also provides a method for manufacturing an automobile wheel, comprising the steps of: providing a plating property of a trivalent chromium plating by an auxiliary anode material for forming an automobile wheel to which a trivalent chromium plating is applied; It is possible to maximize the lifetime of the auxiliary anode by securing excellent corrosion resistance against sulphate, achieving a high quality of the automobile wheel surface with a unique color tone of trivalent chromium and utilizing the easily dissolvable nature of titanium and graphite.

Further, since the present invention can apply a uniform plating surface by maintaining a constant current density, it is possible to reduce the incidence of failure of the wheel, reduce the manufacturing cost, improve the durability, and improve the aesthetic effect.

In addition, according to the auxiliary anode material for forming the automobile wheel to which the trivalent chromium plating of the present invention is applied, since the current density can be increased, the plating time of the automobile wheel can be shortened, Thereby maximizing the production amount.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a coupling between an outer surface auxiliary anode and an inner surface auxiliary anode according to an embodiment of the present invention; FIG.
2 is a perspective view and partial enlarged view of an auxiliary auxiliary anode for an automobile wheel according to an embodiment of the present invention;
3 is a perspective view of an inner surface auxiliary anode for an automotive wheel according to an embodiment of the present invention.
Figure 4 is a use state diagram of the present invention in accordance with an embodiment of the present invention;

Hereinafter, an auxiliary anode material for forming a trivalent chromium-plated automobile wheel according to the present invention for solving the problems of the prior art will be described in detail. 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 construed 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.

The car wheel to which the hexavalent chromium plating of the prior art is applied and the wheel to which the trivalent chromium plating according to the present invention is applied differ only in the process of plating the surface of the chromium plating layer and the other plating processes are almost the same or similar. The nickel plating layer under the chromium plating layer includes not only the case where the hexagonal chromium plating is performed but also the case where the trivalent chromium plating is performed. The nickel plating layer and the chromium plating layer described above are electroplated. When the surface is not a uniform surface due to the nature of the electroplating, the plating does not grow uniformly on the surface. Particularly, in the case of the automobile wheel 300, since the size and depth of the parts of the automobile wheel 300 are larger than those of the other parts, a supplementary anode considering the shape of the automobile wheel is applied in order to obtain uniform plating.

4, the inner auxiliary anode 200 and the outer auxiliary anode 100 are coupled to the wheel 300, as shown in FIG. 4, because of the process characteristic of the chromium plating layer as shown in FIG. 4 . The inner surface of the automobile wheel has a basic shape of a circular shape because only the rim flange 90, which is the edge of the wheel, needs plating. In the outer surface of the automobile wheel, the lug hole 91, which is the center of the wheel, and the spoke 92, which connects the edge and the center of the wheel, are low in current density. Therefore, And a positive electrode connected to each of the auxiliary positive electrode and the auxiliary positive electrode is provided adjacent to the hole and the spoke.

Further, in the present invention, a circular plate of titanium material and graphite, which is a main element of carbon, are used to match the characteristics of the trivalent chromium plating solution. Titanium is not only conventional nickel plating but also insoluble in the amount of trivalent chromium, and can be made into a circle. The graphite is excellent in conductivity as a carbon component and is suitable for realizing excellent plating appearance by increasing the current density at a portion deep inside the wheel such as a lug hole portion or a spoke portion of the wheel and does not form an oxide film during plating, Chromium was selected as a cathode rod bonded to the auxiliary anode, which had no property of contaminating the anode. However, it is difficult to realize a circular shape due to the non-ductile physical properties of the graphite. A graphite rod 50, which is small on the outer circular plate 70 of titanium, is connected to the inner auxiliary anode through a bracket 71, And the outer auxiliary anode 100 has a graphite rod connected to the titanium outer circular plate 10 and the inner circular plate 20 in a depth direction.

[Example]

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

In the present invention, the sub dimensions of the auxiliary anode using the graphite rods 50 of the above-described shape are configured to be close to the rear face of the rim flange of the wheel so as to be capable of plating with trivalent chrome, Are based on 19-inch wheels as follows.

In the case of the inner surface auxiliary anode 200 of the present invention, a titanium bar-shaped bar having a thickness of 5.6 mm and a width of 10.7 mm, that is, a lug hole supporter 80) in the form of welding or the like. Thereafter, the lug hole inserting portion 81 is disposed at the center of the lug hole fixing portion. Thereafter, 14 Y-shaped titanium brackets 71 having a thickness of 1.0 mm and a length of 30.0 mm are welded on the titanium outer circular plate 70 at intervals of 60 mm. After that, 14 pieces of graphite rods having a diameter of 10Ø and a length of 70.0 mm were inserted horizontally on each bracket, and the graphite rod was fixed so that a proper current density required on the inner surface during trivalent chromium plating could be ensured. Further, in order to apply a high current to the inner and outer coercive anodes, a power connection lead 82, which is connected to the rear surface of the lug hole fixing portion by welding or the like, is disposed.

In the case of the outer surface of an automobile wheel, there are various plating surfaces in the depth direction and the surface where the actual plating is visible, and the plating surface size is larger than the inner surface of the wheel. In order to obtain adequate plating for such complex shapes, we developed outer auxiliary anode with the following dimensions.

In order to concentrate the plating on the inside of the outer surface of the automobile wheel, a titanium bar-shaped bar having a thickness of 5.6 mm and a width of 10.7 mm was formed on a titanium outer circular plate 10 having a diameter of 390 mm, In order to facilitate plating of the spoke portion of the insertion portion supporter 40 and the wheel, a spoke auxiliary anode 30 made of titanium is formed in the shape as shown in Fig. In order to ensure the platability in the depth direction of the outer surface of the wheel with the graphite rod 50, a titanium bolt 60 having a diameter of 8 Ø and a length of 12 mm is inserted into a pipe having a diameter of 10 Ø and a length of 21 mm, The first pipe rings 31 were made by welding or the like so as to be in contact with the inner surface of the titanium outer circular plate and nine graphite rods having a diameter of 10 mm and a length of 70 mm were set between the rings, And the plated surface was secured.

In the outer auxiliary anode of the present invention, a titanium rod-type bar (lug hole insertion portion support 40) having a thickness of 5.6 mm and a width of 10.7 mm and a small titanium inner circular plate 20 having a diameter of 100 mm are provided in a portion of the wheel located in the lug hole, Is formed in the same size as the lug hole of the wheel, and the lug hole insertion portion (41) is protruded from the front surface of the outer surface auxiliary anode at the center of the bar of the titanium rod shape. Then, a small titanium inner circular plate 20 and a titanium bar-shaped center bar (lug hole insertion portion support rod) are welded to the lug hole surface as shown in FIG. 2, and then a second pipe 32), a titanium bolt (60) of 8 mm in diameter and 12 mm in length is inserted into the side of the pipe. Then, considering the size of the lug hole of the wheel, five pipes were welded to the outside of the side of the small titanium inner circle plate at intervals of 53mm to make a ring (second pipe ring), and 5 pieces of graphite rods having a diameter of 10Ø and a length of 70mm It is preferable to construct the anode bar of the auxiliary anode by vertically inserting it.

As described above, in order to compare the coating thicknesses of the auxiliary anode of the nickel plating and the auxiliary anode applied to the chromium plating of the present invention, which have been studied to develop the auxiliary anode applicable to the trivalent chromium plating of the present invention, . The areas that were difficult to be plated were intensively compared. In the case of the inside of the rim flange of the wheel, the thickness of the chromium plating layer to which the trivalent chromium plating is applied as the auxiliary anode composed of the titanium round plate and the glyphite anode rod of the present invention is the auxiliary anode made of the titanium round plate and the titanium anode rod, The thickness increased by about 50% compared with the plating application. At the side of the lug hole of the wheel, the thickness increased by about 100%, and the spoke side of the wheel also rose by about 100%. In addition, when plating is performed according to the present invention, compared with the plating of the prior art, it is possible to secure not only the plating thickness of the wheel surface but also the constant current density, the quality of the surface of the wheel is reduced by decreasing the foreign matter concentration in the plating solution Respectively. That is, in the case of the prior art, there is a problem of surface smear, poor gloss and lack of color in the outer surface, but it can be confirmed that this problem does not occur in the present invention.

Plating according to the prior art
(Trivalent chrome plating auxiliary anode using titanium anode rod) Using graphite rods
Secondary anode for trivalent chromium plating layer Rim flange interior
(8 cm from outside) 0.21 탆 (minimum standard) 0.32 탆 Lug hole side 0.11 탆 0.24 탆 Spoke side 0.09 탆 0.17 탆 Exterior plating quality Surface stain, poor gloss, lack of color Good

The actual plating thickness distribution map of the wheel sample produced by the present invention (based on Hyundai Motors EXUS 19-inch mass production wheel) is shown in Table 2 below. Specifically, it can be seen that the nickel plating layer and the trivalent chromium plating layer are uniformly formed in the overall portion of the wheel manufactured using the present invention, that is, in the spoke general portion, the flange general portion, and the spoke. However, since the spoke vertical side is a portion where the current is low, it is a portion where the plating thickness is not formed well, but plating can be performed at least 75% of the plating thickness necessary for obtaining the effect such as corrosion resistance. In the case of commercial production, By further adjusting the plating time, it is possible to expect a better effect compared to the prior art.

division Spoke general part Flange general part Inside spoke Spoke vertical side Plating Thickness
Measures Chrome: 0.31 to 0.39 탆
Nickel: 22 ~ 27㎛ Chrome: 0.24 to 0.34 탆
Nickel: 18 ~ 24㎛ Chrome: 0.32 to 0.43 탆
Nickel: 24 ~ 32㎛ Chrome: 0.17 ~ 0.21 탆
Nickel: 15 ~ 22㎛

Next, comparing the plating properties by various combinations of the auxiliary anode material selection and the appearance after the material plating, that is, the auxiliary anode made of the titanium round plate and the graphite cathode rod of the present invention, and the iron used as various cathode materials for plating And the results are shown in Table 3 below. Conventional auxiliary anode plates and rods are made of iron. When hexagonal chromium plating is performed, a uniform hexagonal chromium plating surface is realized. However, when trivalent chromium plating is carried out, there arises a problem that the gloss is lowered due to defective appearance of the surface of the plating as in comparative example 1. [ In the case where the auxiliary anode plate is made of iron and the auxiliary anode bar is made of titanium, there is a problem that surface unevenness occurs due to defective appearance of the surface of the plating as in comparative example 2 and color tone is insufficient. The present invention solves this problem, and it can be confirmed that a uniform plating surface is realized when trivalent chromium plating is performed with a graphite auxiliary anode bar on a titanium auxiliary cathode plate.

Existing plan
(When hexavalent chromium is plated)
Supplementary bipolar plate, rod iron Invention invention
(When trivalent chrome is plated)
Titanium auxiliary positive plate
+ Graphite rods Comparison 1
(When trivalent chrome is plated)
Supplementary bipolar plate, rod iron
Comparison 2
(When trivalent chrome is plated)
Auxiliary bipolar plate iron +
Auxiliary anode rod titanium Plated
Exterior Achieve uniform hexavalent chrome plating surface

Achieves uniform trivalent chrome plating surface Plating appearance defect
(Gloss decrease) Plating appearance defect
(Surface stain and lack of color)

When the auxiliary anode material for forming an automobile wheel to which the trivalent chromium plating of the present invention is applied is used, it is possible to obtain a uniform plating appearance and corrosion resistance which can not be achieved by the conventional auxiliary anode in the trivalent chromium plating And further, when trivalent chromium plating is applied, the corrosion resistance against desalted salt of about 50 times higher than that of the existing hexavalent chromium plating can be ensured. In addition, trivalent chromium plating can achieve a high color tone of the automobile wheel because it can secure a dark color, and can maximize the lifetime of the auxiliary anode by using the property that insoluble titanium and graphite are not easily dissolved in the plating solution .

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.

10: outer circular plate of outer auxiliary anode for automobile wheel
20: inner circle plate of outer auxiliary anode for automobile wheel
30: Spoke auxiliary anode of outer auxiliary anode for automobile wheel
31: 1st pipe ring of outer auxiliary anode for automobile wheel
32: second pipe ring of outer auxiliary anode for automobile wheel
40: Lug hole insertion part support for outer auxiliary anode for automobile wheel
41: Lug hole insertion part of outer auxiliary anode for automobile wheel
50: graphite rods
60: Bolt of outer auxiliary anode for automobile wheel
70: outer circular plate of inner auxiliary anode for automobile wheel
71: Bracket for internal auxiliary anodes for automotive wheels
80: Lug hole support of inner auxiliary anode for automobile wheel
81: Lug hole insertion part of inner auxiliary anode for automobile wheel
82: Power connection lead of inner auxiliary anode for automobile wheel
90: Rim flange of automobile wheel
91: Lug hole of car wheel
92: Spokes for car wheels
100: External auxiliary anode for automotive wheels
200: Internal auxiliary anode for automotive wheels
300: Automobile wheel

Claims

A plurality of spoke auxiliary anodes coupled radially between an outer circular plate and an inner circular plate disposed in a central portion thereof;
A plurality of first pipe rings coupled to one side of the spoke auxiliary anode and being in contact with the outer circular plate;
A plurality of second pipe rings coupled to the other side of the spoke auxiliary anode and in contact with the inner circular plate;
A support bar coupled to the inner circular plate and having a lug hole insertion portion protruding therefrom; And
And a plurality of graphite rods inserted into the first pipe ring and the second pipe ring so as to be perpendicular to the outer and inner circular plates, respectively.

The method according to claim 1,
Further comprising: a bolt inserted into the side of the first and second pipe rings to fix the graphite rod; and an outer auxiliary anode for forming the automobile wheel to which the trivalent chrome plating is applied.

3. The method of claim 2,
Wherein the outer ring plate, the inner circular plate, the spoke auxiliary anode, the first pipe ring, the second pipe ring, the lug hole insertion portion, the support and the bolt are made of titanium. Auxiliary anode.

A lug hole fixing part coupled to the outer circular plate so as to be traversed and having a lug hole insertion part protruding from the front side;
A plurality of brackets coupled along a front surface of the outer circular plate;
A plurality of graphite rods coupled to the bracket so as to be parallel to the outer circular plate; And
A spoke auxiliary anode, and a power connection lead connected to a rear surface of the lug hole fixing portion for applying a high current to the graphite rod,
The bracket is Y-shaped,
Wherein the outer circular plate, the lug hole insertion portion, the lug hole fixing portion, the bracket, and the power connection lead are made of titanium, wherein the inner auxiliary anode for forming the automobile wheel to which the trivalent chrome plating is applied is provided on the inner surface of the wheel,
An auxiliary anode for forming an automobile wheel to which an outer auxiliary anode for an automobile wheel according to any one of claims 1 to 3 is attached to an outer surface of a wheel.

delete

A method for plating an automobile wheel with trivalent chromium by using an auxiliary anode for forming an automobile wheel to which the trivalent chromium plating of claim 4 is applied.