JPS6017040B2 - Resin coated anode bolt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly aims at supporting an aluminum-based material to be treated, when applying alumite treatment and/or secondary electrolytic coloring to aluminum or aluminum alloy materials.
This invention relates to improvements to anode bolts for fixing.

Conventionally, the methods for coloring aluminum-based products generally include (1) a dyeing method in which the pores formed in the anodic oxide film formed on the surface of the product by alumite treatment are impregnated with a dye, or (2) a solution treatment in a metal salt solution. An electrolytic coloring method is often used in which metal ions are deposited in the pores of the anodic oxide film.

When comparing these two methods, in the former dyeing method (■), the dye used therein has poor weather resistance, while in the latter (■) electrolytic coloring method, such disadvantages do not exist. There is no. Therefore, in the case of products that particularly require film resistance, such as aluminum collar sashes and fences, electrolytic coloring methods are generally being explored. This secondary electrolytic coloring method for aluminum involves forming an anodized film on the surface of an aluminum product through so-called alumite treatment, and then electrolytically treating the product with alternating current or a current similar to alternating current in a metal salt-containing solution. This is a method of coloring salt to a color unique to salt, and normally an alumite treatment and a subsequent secondary electrolytic coloring treatment are performed continuously.

The issue here is the anode bolt used to support the aluminum product during this series of processing steps. To explain this point more specifically with reference to FIG. Aluminum material 1
A clip member 2 made in a U-shape so as to sandwich the ends of the clip member 2, and an anode bolt 4 screwed into a female threaded hole 3 on the side of the clip member 2 to press and hold the aluminum material 1 are used.

In FIG. 1, reference numeral 5 indicates a bolt hole, and in most cases, a bolt passing through this bolt hole 5 is used to fix the aluminum material 1 to a current-carrying hanger, an electrode, or the like. Here, aluminum or an aluminum alloy is generally used as the anode member including the anode bolt 4 in question.

When an anode member made of aluminum or an aluminum alloy (hereinafter referred to as an aluminum anode member) is subjected to a series of alumite treatment and secondary electrolytic coloring treatment, the surface of the anode member during the alumite treatment is Since an anodic oxide film is formed on the surface of the product as well as on the surface of the product, the current flowing out from the surface of the anode member during the secondary electrolytic coloring treatment will be at the same level as the surface of the product, so that the current flow will be locally concentrated on the anode member. This is because the coloring of the product can be done uniformly. However, since aluminum anode members gradually wear out during repeated use, it is difficult to avoid problems in terms of durability and the like.

That is, as mentioned above, the aluminum anode part is anodized together with the product through the alumite treatment performed prior to the secondary electrolytic coloring treatment, and an anodic oxide film is generated on its surface, but this anodic oxide film is During treatment, it is removed by alkaline degreasing or chemical polishing, which is a pre-process of alumite treatment. Therefore, with aluminum anode members, the anodic oxide film is repeatedly formed and removed each time the product is processed, and the material gradually wears out, so replace it with a new one before it loses sufficient strength to support the product. Therefore, the aluminum anode member is a consumable material, and the cost of the anode member in the operating cost cannot be ignored. Therefore, the applicant of the present application first proposed a new anode member (hereinafter referred to as zirconium anode member) made of zirconium or zirconium alloy as a material to solve the problems with the general aluminum anode members described above. (Showa 53 King Patent Face No. 3716, 1978 Patent Application No. 37161). The zirconium anode member proposed in the future is one in which an oxide film is formed on the surface of zirconium or zirconium alloy material by anodizing or heating in the atmosphere, and the oxide film on the surface is removed by an alkaline degreasing or chemical polishing process. On the other hand, since the oxide film on the zirconium anode is extremely thin, the contact area with the material to be treated may be destroyed, making it difficult to obtain a contact point. But it is preferable. However, as a result of various studies regarding such zirconium anode parts, it was newly discovered that there are some drawbacks when used in the form of the anode bolt of the present application. The drawback is that color unevenness may occur when used repeatedly. As mentioned earlier, the oxide film formed on the surface of the zirconium anode is relatively easy to destroy, so it is convenient for obtaining electrical contacts, but on the other hand,
If the oxide film is destroyed in areas other than the contact points, electricity will intensively flow in and out from there, causing color unevenness during secondary electrolytic coloring. In other words, among zirconium anode members, the oxide film on the anode bolt on the male thread is easily destroyed by friction with the female thread, and during repeated setting, the oxide film may also be destroyed at locations other than the contact point. Therefore, during the secondary electrolytic treatment, current intensively flows in and out from the male threaded part of the anode bolt and other film-broken parts other than the contacts, resulting in color unevenness. This invention was made in consideration of the above points, and is an anode bolt that can reliably solve the problem of color unevenness caused by damage to the oxide film while taking advantage of the advantages of having the anode bolt made of zirconium. The purpose is to provide the following.

Hereinafter, the content of the present invention will be explained with reference to the attached FIGS. 2 and 3.

First, as a feature of the present invention, in the anode bolt according to the present invention, an oxide film is formed on the surface of at least the male thread forming part of the bolt body made of zirconium or its alloy, and on this oxide film. It is characterized by being covered with resin.

Therefore, as shown in FIGS. 2 and 3, the anode bolt 10 according to the present invention includes a bolt body 11 made of zirconium or an alloy thereof, and a bolt body 11 made of zirconium or an alloy thereof.
The oxide film 13 formed on the surface of 1 and this oxide film 13
and a resin coating layer 12 that covers the.

As the material for the bolt body 11, a zirconium alloy represented by zircaloy is most suitable since the amount of current flowing out during the secondary electrolytic treatment is smaller, but zirconium can also be used. On the other hand, the material for the resin coating layer 12 should be selected from materials with high strength and abrasion resistance, such as nylon 66 or its glass fiber-containing material, polyphenylene sulfide resin or its glass fiber-containing material. etc. can be used. In particular, glass fiber-containing resin is the most excellent in terms of each of the above characteristics. In addition, in cases where a resin coating is applied after coloring, such as in the case of colored sashes, a drying process is required, so heat resistance is also required, and glass-containing resins are also preferred in terms of heat resistance. As shown in FIG. 2a, such a resin coating layer 12 can be made to cover the entire bolt head 11a and neck lower part 11b, or
Alternatively, as shown in b and c of the same figure, the bolt head 11
It is also possible to cover only the lower part 11b excluding part a. However, the male thread forming portion 1 located at the lower neck portion 11b
Only 1c requires at least coating. Regarding this male thread forming portion 11c, the above-mentioned clip member 2
This is because strength and abrasion resistance are particularly required for threading with the female threaded hole 3 on the side. In addition, resin coating layer 1
The provision of section 2 in some areas is based on the following recognition. For one thing, when the bolt head 11a is coated with resin, if the thickness of the coating is increased, the resin coating layer will be deformed by the tightening stress and will not be able to withstand repeated use. Even if a slight inflow and outflow of current occurs in a part more than a few centimeters away from the anode bolt 11, it will hardly affect the color development, so it is not necessarily necessary to provide the resin coating layer 12 on that part of the anode bolt 11; It is. Further, as a method for forming the resin coating layer 12, general methods such as coating or injection molding can be used, but injection molding is most preferable in terms of productivity, economy, etc.

Moreover, in the case of this injection molding, the resin coating layer 12
Since the final shape can be imparted to the bolt in one step, a thread can be formed in the resin coating layer 12 itself without forming a thread in the bolt body 11, as shown in FIGS. 1b and 1c.
Furthermore, the oxide film 13 is formed in order to enable the anode bolt 10 to be used for a longer period of time than if the bolt body 11 were simply covered with the resin coating layer 12. That is, when the anode bolt 10 is used for a long period of time, cracks may occur in the resin coating layer 12, and in such a case, the electrolyte may pass through the cracks and come into direct contact with the bolt body 11. obtain. Therefore, the anode bolt 101 of this invention
In this case, an oxide film 13 is formed on the surface of the bolt body 11 to prevent the electrolyte from coming into direct contact with the bolt body 11. In this way, even if cracks occur in the resin coating layer 12, the electrolyte can be prevented from coming into contact with the bolt body 11, so the anode bolt 10 can simply be used for a longer period of time. However, regardless of the presence or absence of cracks, the oxide film 13 is protected from contact with the threaded surface of the female threaded hole of the clip portion village 2 by the resin coating layer 12, so that it is not removed from the bolt body 11. Therefore, the anode bolt 11 can be used semi-permanently. In other words, the problem of color unevenness caused by current flowing out from the anode bolt 10 can be reliably solved. In addition, as a method for forming the oxide film 13, anodic oxidation or heating in the atmosphere can be used.
It is preferable to use a sulfuric acid electrolyte of about 0% or an oxalic acid electrolyte of about 3 to 5%, and perform the anodization at a voltage higher than the alumite treatment voltage, such as about 50 to 130 V.

Thereby, a more delicate anodic oxide film can be obtained. In addition, as for the portion where the oxide film 13 is shaped, the external thread forming portion 11 of the bolt body 1 is similar to the resin coating layer 12.
c, but if formed by the method described above, it will be formed over the entire surface of the bolt body 11.

As mentioned above, in the anode bolt according to the present invention,
An oxide film is formed on the surface of at least the male thread forming part of the bolt body made of zirconium or its alloy, and this oxide film is covered with resin, so the essential advantage of the zirconium anode part is that Taking advantage of this, it is also possible to effectively solve the problem of color unevenness caused by current leakage from the anode bolt.

Therefore, next, from the point of view of concretely showing such an effect,
An embodiment of this invention will be described.

[Example 1] Zircaloy-4, a zirconium alloy, was hot-forged (hereinafter referred to as electric plating) by direct electric heating into a round willow.

), prepare a bolt body with a square head and a ◇5 cape x 45 style bolt under the neck.Furthermore, after performing a non-slip knolling process on the side wall of the lower neck of this bolt body, degreasing, drying with acid using hydrofluoric acid After pretreatment such as washing, oxidation heat treatment was performed at 45,030°C for 3 minutes in the air. Next, a glass fiber-containing nylon 6-wipe Korean resin coating layer was formed around the lower part of the neck of the bolt body by injection molding, and a 3/8 layer similar to that shown in FIG. 1b described above was formed.
100 inches of anode bolts of the present invention were made and tested by incorporating them into an actual production line for aluminum color sashes. As a result, the anode bolt of the present invention did not develop any color unevenness even after one year had passed, and its appearance was still in a condition that could withstand long-term use. [Example 2] Prepare a bolt body with a hexagonal head and a 4.5 willow (with thread) neck by electroplating and rolling a zirconium J8 round bar.
Further, this bolt body was subjected to the same pretreatment and oxidation heat treatment as in Example 1.

Next, the surface of this bolt body is coated with polyphenylene sulfide resin, and M
IO anode bolt of this invention (resin coating layer thickness 0.2
skin) was prepared and used for testing. In the test, an anode bolt was inserted into a female screw hole drilled in an aluminum alloy plate (6063) for 5 minutes.
After the secondary loading and unloading of 0, the pure aluminum plate (1100) of the material to be treated is fixed to the hanger using the anode bolt (the contact point is taken from the hanger).

), immersed in an electrolytic solution, alumite treated and secondary electrolytically colored, but no color unevenness occurred at all.

[Brief Description of the Drawings] Figure 1 is a perspective view showing an example of the use of the anode bolt of the present invention;
FIGS. 2a to 2c are sectional views showing respective embodiments of the anode bolt according to the present invention, and FIG. 3 is an enlarged view of the m-circle portion in FIG. 2. 10... Anode bolt according to this invention, 11...
... Bolt body, 12 ... Resin coating layer, 13.
...Oxide film. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. An anode bolt used for supporting a material to be treated during initial alumite treatment and/or electrolytic coloring, comprising:
It is characterized by consisting of a bolt body made of zirconium or its alloy, an oxide film formed on the surface of at least the male thread forming part of the bolt body, and a resin coating layer formed on the oxide film. Resin coated anode bolt. 2. The resin-coated anode bolt according to claim 1, wherein the material of the resin coating layer is a resin containing glass fiber.