JP2001073194A - Coated parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the adhesion of a coating material in coated parts made of a magnesium alloy in particular and moreover to prevent the corrosion of the coated parts. SOLUTION: On the surface of a base material part 10 made of a magnesium alloy, an anodically oxidized coating film layer 11 is formed by an anodic oxidation method. On the surface of the anodically oxidized coating film layer 11, an electrodeposition insulated coating film layer 12 is formed by an electrodeposition coating method. On the surface of the electrodeposition insulated coating film 12, an ultraviolet hardened coating film layer 13 is formed. The film thickness of the anodically oxidized coating film layer 11 is controlled to 3 to 15 μm. In this way, the adhesion of the electrodeposition insulated coating film layer 12 is improved, and moreover, the corrosion of the base material part 10 is made hard to be caused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a painted part,
The present invention relates to painted parts made of magnesium alloy used outdoors such as bicycle parts and fishing goods.

[0002]

2. Description of the Related Art Parts used for bicycles and fishing goods which are often used outdoors, especially parts made of magnesium alloy, often have a coating film formed on the surface thereof. When such a coating film is formed, the component body made of the magnesium alloy is not exposed to the corrosive atmosphere, and the corrosion resistance can be improved.

Prior to forming such a paint film, an anodic oxide film layer is often formed on a magnesium alloy component body to further prevent corrosion. In this case, the coating is applied on the anodic oxide coating layer.However, when the electrodeposition coating method is used, the magnesium alloy component body is completely immersed, so that the corrosion resistance can be dramatically improved. it can.

[0004]

In a conventional magnesium alloy coated part, when an electrodeposition coating layer is formed on the anodic oxide coating layer, the thickness of the anodic oxide coating layer is increased to improve corrosion resistance. It is formed thick. However, if the thickness of the anodic oxide coating layer is increased, it becomes difficult to maintain the surface of the component body at a predetermined voltage at the time of electrodeposition coating, so that the adhesion of the paint is reduced.

Conversely, if the thickness of the anodic oxide coating layer is reduced, the anodic oxide coating layer is damaged and the surface of the magnesium alloy component body is easily exposed. When the anodic oxide coating layer is damaged as described above, water, foreign matter, and the like intrude from the exposed portion, and the magnesium alloy component body is easily corroded. An object of the present invention is to improve the adhesion of a paint to a painted part and prevent corrosion of the painted part, particularly in a painted part made of a magnesium alloy.

[0006]

The painted part according to the first aspect of the present invention is a part whose surface is painted, and has a part body made of a magnesium alloy and a film thickness of 3 μm or more and 15 μm or less on a surface layer side of the part body. An anodic oxide coating layer formed as described above, and an electrodeposition coating layer formed on the surface side of the anodic oxide coating layer.

In this coated part, since the thickness of the anodic oxide coating layer is formed to be 15 μm or less, the voltage on the surface of the part body is maintained at a predetermined voltage when the electrodeposition coating is performed thereon. The adhesion of the coating material is improved. Further, since the thickness of the anodic oxide coating layer is 3 μm or more, the component body made of the magnesium alloy is hardly exposed. Therefore, the corrosion of the component main body can be made hard to occur.

[0008] A painted part according to a second aspect of the present invention is the component according to the first aspect, further comprising an ultraviolet-cured coating layer formed on the surface side of the electrodeposition coating layer. In this case, since the ultraviolet-curable coating layer is an ultraviolet-curable resin such as an unsaturated polyester resin and can be uniformly cured in a short time, the wear resistance of the component body can be improved. Further, the gloss of the lower electrodeposition coating layer is exhibited by the leveling effect, so that the appearance of the component body can be improved.

A painted part according to a third aspect of the present invention is the component according to the first or second aspect, wherein the component body is used for fishing equipment. In this case, the coating layer of the fishing gear, which is often used in an outdoor corrosive atmosphere, is less likely to be damaged, and the aesthetic appearance of the fishing gear can be maintained. It becomes difficult to do.

A painted part according to a fourth aspect of the present invention is the component according to the first or second aspect, wherein the component body is used for a bicycle.
In this case, since the coating layer of the bicycle component often used outdoors is less likely to be damaged, the appearance of the bicycle can be maintained. In addition, the component body is less likely to be directly exposed to the outside air, and the component body is less likely to corrode.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A dual-bearing reel adopting a first embodiment of the present invention is a low-profile type reel for bait casting, as shown in FIGS. The dual bearing reel is rotatably and detachably mounted inside the reel body 1, a spool body 2 made of a magnesium alloy, a spool rotating handle assembly 2 arranged on the side of the reel body 1. And a spool 4 for thread winding. Reel body 1 of handle assembly 2
On the side, a star drag 3 for drag adjustment is provided.

The reel body 1 has a frame 5, side covers 6 mounted on both sides of the frame 5, a front cover 7 covering the front of the frame 5, and a thumb rest 8 covering the upper part. Each member constituting the reel body 1 is made of a magnesium alloy, and the surface of each member is subjected to various surface treatments. Next, the surface structure of each member constituting the reel body 1 will be described in detail.

As shown in FIG. 3, an anodic oxide coating layer 11 is formed on the surface of the magnesium alloy base member 10 of each member by an anodic oxidation method. On the surface of the anodic oxide coating layer 11, an electrodeposition insulating coating layer 12 is formed by an electrodeposition coating method. An ultraviolet cured coating layer 13 is formed on the surface of the electrodeposition insulating coating layer 12. The anodic oxide coating layer 11
Using the magnesium alloy substrate 10 as an anode, sulfuric acid,
When electrolysis is performed in a solution such as oxalic acid or chromic acid, a film is formed due to oxygen generated at the anode. Further, the thickness of the anodic oxide coating layer 11 is formed to be 3 μm or more and 15 μm or less. For this reason, when applying the electrodeposition coating to the surface layer side of the anodic oxide coating layer 11, the voltage on the surface of the base 10 can be easily maintained at a predetermined voltage, and the adhesion of the electrodeposition insulating coating layer 12 is improved. I do. The thickness of the anodic oxide coating layer 11 is 3 μm.
m or more, it is difficult to expose the base portion 10 made of a magnesium alloy. Therefore, corrosion of the base member 10 can be made less likely to occur.

The electrodeposition insulating coating layer 12 is formed by, for example, an electrodeposition coating method using a cationic electrodeposition coating material containing a polyamine resin as a main component. In the case of performing the electrodeposition coating in this manner, the base portion 10 on which the anodic oxide coating layer 11 is formed is immersed in a paint tank, and the base portion 10 is used as a cathode, and the electrode plate provided on the paint layer is used as an anode. To apply the paint electrically. The electrodeposition insulating coating layer 12 is formed to have a thickness of 5 μm or more and 25 μm or less. As described above, since the electrodeposition insulating coating layer 12 is formed by the electrodeposition coating method, while improving rust prevention,
It becomes easy to adhere uniformly to the surface of the anodic oxide coating layer 11.

The ultraviolet-curable coating layer 13 is formed using an ultraviolet-curable paint such as an unsaturated polyester resin. Further, the thickness of the ultraviolet cured coating layer 13 is formed to be 5 μm or more and 15 μm or less. Such an ultraviolet-cured coating layer 13 is uniformly cured in a short time, so that the abrasion resistance can be improved. The UV-cured coating film layer 13 can exert the gloss of the electrodeposition insulating coating film layer 12 by a leveling effect for smoothing the unevenness of the substrate. In addition, since the ultraviolet curing coating layer 13 is a transparent and clear coating layer, the gloss of the electrodeposition insulating coating layer 12 can be expressed on the outer surface.

The handle assembly 2, the star drag 3, and the spool 4 are also made of a magnesium alloy. On these surfaces, for example, as shown in FIG. 4, an anodic oxide coating layer 11 is formed on the surface of a magnesium alloy base member 10 of each member by an anodic oxidation method.
An electrodeposition insulating coating layer 12 is formed on the surface of the substrate 1. In this case, since it is not necessary to apply a decoration such as a glossing treatment to a portion exposed to the external appearance of each member, the ultraviolet cured coating layer 13 is not formed.

In the surface structure of each of the magnesium alloy members constituting the handle assembly 2, the star drag 3, and the spool 4, the thickness of the anodic oxide coating layer 11 is formed to be 3 μm or more and 15 μm or less. Have been. Therefore, when the electrodeposition coating is performed on the surface layer side of the anodic oxide coating layer 11, the adhesion of the electrodeposition insulating coating layer 12 is improved.
Further, since the thickness of the anodic oxide coating layer 11 is 3 μm or more, the base portion 10 made of the magnesium alloy is difficult to be exposed.
Therefore, corrosion of the base member 10 can be made less likely to occur.

Second Embodiment In the first embodiment, a dual-bearing reel has been described as an example of fishing equipment, but the present invention can also be applied to bicycle parts. As shown in FIG. 5, a bicycle component employing the second embodiment of the present invention is a bicycle crank assembly 70 comprising a right crank arm 72 and a left crank arm which are non-rotatably fixed to both ends of a crank shaft 75. 73. The crankshaft 75 is rotatably supported by a bottom bracket 71 mounted on a bicycle frame (not shown).

As shown in FIG. 6, the right crank arm 72 has a boss 80 fixed to the crankshaft 75 of FIG.
A crank portion 81 extending radially outward from the boss portion 80,
And five connecting fingers 82 extending radially outward from the boss 80. The connecting fingers 82 are arranged at substantially equal intervals, and the crank portion 81 extends radially from between the two connecting fingers 82. A sprocket 83 is detachably attached to the connecting finger 82 by a bolt.

The right crank arm 72 is made of a magnesium alloy. A pedal 90 is provided at the tip of the crank portion 81.
Are mounted. A screw hole 85 is formed at the tip of the crank portion 81 for this attachment. The screw hole 85 is formed in a sleeve 86 that is non-rotatably press-fitted into the tip of the crank portion 81. A gap between the sleeve 86 and the tip of the crank portion 81 is filled with an adhesive. On the surface of the magnesium alloy base portion 10 of the right crank arm 72, an anodic oxide coating layer 11, an electrodeposition insulating coating layer 12, and an ultraviolet curing coating layer 13 are formed as shown in FIG. I have.

As shown in FIG. 5, the left crank arm 73 has a boss 87 and a crank 88 extending radially outward from the boss 87. A sleeve 86 made of an aluminum alloy is also press-fitted into the tip of the crank portion 88, and an anodic oxide coating layer 11, an electrodeposition insulating coating layer as shown in FIG. 1
2 and an ultraviolet cured coating layer 13 are formed.

In such a bicycle magnesium component, the right crank arm 72 made of a magnesium alloy is also used.
And the left crank arm 73, as in the first embodiment,
Since the anodic oxide coating layer 11 is formed to have a thickness of 3 μm or more and 15 μm or less, the adhesion of the electrodeposition insulating coating layer 12 is improved. The thickness of the anodic oxide coating layer 11 is 3 μm.
Because of the above, the corrosion of the base member 10 can be suppressed.

[Other Embodiments] (a) The magnesium component according to the present invention is not limited to the magnesium component disclosed in the above embodiment, such as a reel body of a fishing reel and a crank arm of a bicycle. It can be applied to magnesium parts used for products mainly used outdoors, such as fishing goods and bicycles. For example, the present invention can be applied to magnesium parts such as a fishing rod, a cooler box, a brake device such as a brake lever and a brake arm of a bicycle, and a transmission device such as a front derailleur and a rear derailleur.

(B) The ultraviolet-cured coating layer 13 is not limited to a transparent and clear one, but may be a colored one.

[0025]

According to the present invention, in a coated part made of a magnesium alloy, the thickness of the anodic oxide coating layer is formed to be 3 μm or more and 15 μm or less. In addition, the paint adhesion is improved, and corrosion of the component body can be suppressed.

[Brief description of the drawings]

FIG. 1 is a plan view of a dual-bearing reel employing a first embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of the dual-bearing reel.

FIG. 3 is an enlarged schematic sectional view of a reel body.

FIG. 4 is an enlarged schematic cross-sectional view of a handle assembly.

FIG. 5 is a sectional view of a bicycle crank assembly according to a second embodiment;

FIG. 6 is a front view of a right crank arm of the crank assembly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reel main body 10 Base part 11 Anodized coating layer 12 Electrodeposition insulating coating layer 13 Ultraviolet curing coating layer 72, 73 Crank arm

Claims (4)

[Claims] 1. A component whose surface is painted, a component body made of a magnesium alloy, and an anodic oxide film layer formed on a surface layer side of the component body so as to have a thickness of 3 μm or more and 15 μm or less. A coated part comprising: an electrodeposition coating layer formed on a surface side of the anodized coating layer. 2. The coated part according to claim 1, further comprising an ultraviolet curing coating layer formed on a surface side of said electrodeposition coating layer. 3. The painted part according to claim 1, wherein said part body is used for fishing equipment. 4. The painted component according to claim 1, wherein the component body is used for a bicycle.