JPH10212540A - Aluminum alloy for photosensitive substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the surface properties of a photosensitive substrate used for a copying machine or the like. SOLUTION: An aluminum alloy having a compsn. contg. 0.5 to 1.5% Mg and 0.2 to 0.6% Zn, furthermore contg. one or >= two kinds among 0.05 to 0.4% Mn, 0.05 to 0.2% Cr and 0.05 to 0.2% Zr, in which the content of Cu is regulated to <=0.1%, Fe to <=0.2%, Si to <=0.2%, Ti to <=0.02% and B to <=0.005%, and the balance Al with other inevitable impurities is used for a photosensitive substrate. Good machinability can be obtd., furthermore, the generation of scratch defects and the generation of unevenness in surface treatment at the time of machining re prevented, and the generation of pits after cleaning in specula finishing stage is prevented, by which high surface quality can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy for a photoreceptor substrate used for a photoreceptor drum of a copying machine or a printer. It relates to an aluminum alloy having good processability.

[0002]

2. Description of the Related Art Conventionally, a photosensitive drum (substrate) used in a copying machine or the like is JIS1050Al or JIS30.
It is manufactured by subjecting the surface of a base tube made of 03, 6063 Al alloy to mirror finishing by cutting, and applying a surface treatment such as coating an organic semiconductor layer or depositing a selenium film on the surface. By the way, recently, there is an increasing demand for high definition and high quality of copying machines and the like, and from such a viewpoint, a material used for the photoreceptor drum is desired to have a good cutting property and a high finishing accuracy. It is rare. From this point of view, the photoreceptor substrate is a soft material, which has poor dimensional accuracy and is more excellent in dimensional accuracy and machinability than JIS1050Al material, which is inferior in machinability.
Aluminum alloys 3 and 6063 are widely used.

[0003]

However, although the above-mentioned Al alloy is excellent in machinability, scratches and irregularities in surface treatment during cutting are caused by the large amount of crystallized substances and precipitates. There is a drawback that defects such as are likely to occur. Further, there is also a problem that pits (corrosion holes) are generated after cleaning in the mirror polishing step, and the performance as a photosensitive drum is impaired. Specifically, since a large amount of an Al-Mn- (Fe) -based compound exists in the 3003 alloy containing 1% or more Mn, the above-described scratch defect and pit are likely to occur. On the other hand, in the Al-Mg-Si-based 6063 alloy for precipitation of Mg ₂ Si compound, easily lowered and surface treatment irregularities of the corrosion resistance occurs. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has excellent dimensional accuracy and machinability, and has improved scratch defects, surface treatment unevenness, pit corrosion, etc. It is an object of the present invention to provide a responsive aluminum alloy for a photoreceptor substrate.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive research and development to develop an aluminum alloy capable of manufacturing a photosensitive drum having excellent surface quality. Have been found to be achieved. That is, the aluminum alloy for a photoreceptor substrate according to the present invention has a Mg content of 0.5 to 1.5% by weight.
%, Zn: 0.2 to 0.6%.
05-0.4%, Cr 0.05-0.2%, Zr0.0
Containing one or more of 5 to 0.2%,
u is 0.1% or less, Fe is 0.2% or less, and Si is 0.2% or less.
% Or less, Ti is regulated to 0.02% or less, B is regulated to 0.005% or less, and the balance is composed of Al and other unavoidable impurities.

Next, the reasons for adding the alloy components of the present invention and the reasons for limiting the ranges of the components will be described. Mg: 0.5 to 1.5% Mg has a function of improving strength by solid solution hardening and improving machinability, without forming a solid solution in an aluminum matrix and generating coarse crystals. But,
If it is less than 0.5%, sufficient effects of improving machinability and strength cannot be obtained. On the other hand, if it exceeds 1.5%, extrudability and cold workability will be reduced, so the content is limited to the above range. .
For the same reason, it is desirable to limit the lower limit of the Mg content to 0.6% and the upper limit to 0.9%.

Zn: 0.2-0.6% Zn forms a solid solution in the aluminum matrix and suppresses the occurrence of corrosion pits promoted by the inclusion of Mn or the like, thereby improving pitting corrosion resistance. However, if it is less than 0.2%, a sufficient effect of improving pitting corrosion resistance cannot be obtained, and if it exceeds 0.6%, the corrosion resistance against general corrosion is reduced, so its content is limited to the above range. For the same reason, the lower limit exceeds 0.25%.
It is desirable to limit the upper limit to 0.5%.

Mn: 0.05-0.4% Cr: 0.05-0.2% Zr: 0.05-0.2% The above elements have an effect of improving machinability and contain one or more kinds. Let it. These elements have a problem of causing pitting corrosion during cleaning in the mirror finishing process as seen in JIS3003Al alloy, but the content is adjusted to an appropriate amount and Zn is contained to suppress the occurrence of pitting corrosion. After that, the machinability can be greatly improved. This effect is particularly strong when Mn is contained. However, each of Mn, Cr and Zr is 0.05%.
%, The effect is not sufficient, while Mn 0.4
%, More than 0.2% Cr, and more than 0.2% Zr, pitting corrosion is likely to occur, and coarse crystals are generated, causing scratch defects during cutting and uneven etching during surface treatment. The content of each component is limited to the above range. For the same reason, the lower limit is 0.10% Mn,
r 0.07% and Zr 0.07%, and the upper limit is Mn0.
It is desirable to set the content to 3%, Cr 0.15%, and Zr 0.15%.

Cu: 0.1% or less Cu is inevitably contained as an impurity, but its content is regulated to 0.1% or less in order to deteriorate pitting corrosion resistance. Note that it is desirably 0.08% or less. Fe, Si: 0.2% or less These elements are also inevitably contained as impurities. Since the occurrence of pits after cleaning is caused and the content of Fe lowers the machinability, each content is regulated to 0.2% or less. In addition, it is desirable to regulate each to 0.1% or less. These Fe,
The regulation of Si avoids the above-described problems, and the regulation of Fe improves the machinability. Ti: 0.02% or less, B: 0.005% or less At the time of smelting, Ti and B are sometimes added in order to refine the ingot structure. Since the above-mentioned inconveniences occur due to the formation of products, their contents are regulated as described above. In some cases, Ti and B are not added at the time of smelting, and such an alloy is also included in the present invention.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The aluminum alloy of the present invention can be manufactured by an ordinary method, and is melted with predetermined components.
The regulation of Cu, Fe, and Si in impurities can be performed by carefully selecting raw materials, and can also be performed by employing a special refining method. Furthermore, at the time of smelting, Ti and B can be added in order to refine the ingot structure. However, Ti and B may not be added by, for example, reducing the size of the ingot structure by another method.

The smelted aluminum alloy lump is processed and finished by a conventional method to form a photoreceptor substrate. In this manufacturing process, the aluminum alloy of the present invention has good machinability and can be finished with high dimensional accuracy. In addition, there are few crystallized substances and precipitates, and defects such as scratch defects and surface treatment unevenness are hardly generated, and good surface properties can be obtained. It has excellent corrosion resistance, especially corrosion pit resistance, and pits are reliably prevented even with a cleaning solution having a high detergency, so that high surface quality can be obtained. As described above, the obtained photoreceptor substrate can be used for a photosensitive drum of a copying machine or a printer, but is not limited to this, and can be applied to other photoreceptor substrates.

[0011]

Examples of the present invention will be described below. Each 200 mm diameter billet having the alloy composition shown in Table 1 was produced by DC casting, and after homogenizing at 520 ° C. for 4 hours,
Extrusion at a temperature of 480 ° C results in an outer diameter of 10
A porthole tube having a thickness of 0 mm and a thickness of 4 mm was obtained. The tube was further drawn until the outer diameter became 90 mm and the wall thickness became 3 mm, to obtain a test material. For these test materials, workability (whether or not drawing is possible), machinability (whether chip breaking is good or bad), cutting surface finish (presence or absence of scratches), corrosion resistance (large and small corrosion loss) and pitting corrosion resistance ( Occurrence of pit)
It evaluated by x. Table 2 shows the results. For corrosion resistance, salt spray test (according to JIS-Z2371)
Was carried out for 1000 hours, the corrosion weight loss was measured, and the corrosion weight loss was less than 50 mg / dm ^2, and the evaluation was x. For pitting corrosion resistance, wet test (40 ° C, relative humidity 90% or more)
For 24 hours, and evaluated based on the presence or absence of pits. As is clear from Table 2, the alloy of the present invention showed good results for all the evaluation items, and it was found that the alloy was extremely excellent as an aluminum alloy for a photosensitive drum. On the other hand, the comparative alloy in which any of the additional elements is out of the range of the present invention is inferior in any of the evaluation items.

[0012]

[Table 1]

[0013]

[Table 2]

[0014]

As described above, according to the aluminum alloy for a photoreceptor substrate of the present invention, Mg: 0.1% by weight.
5 to 1.5%, Zn: 0.2 to 0.6%, Mn: 0.05 to 0.4%, Cr: 0.05 to 0.2
%, Zr: one or more of 0.05 to 0.2%, Cu is 0.1% or less, Fe is 0.2% or less, Si is 0.2% or less, Ti Is regulated to 0.02% or less, B is regulated to 0.005% or less, and the balance is made of Al and other unavoidable impurities, so that good cutting properties can be obtained, scratch defects at the time of cutting, surface treatment unevenness. Is prevented, and the occurrence of pits after cleaning in the mirror finishing step is prevented, so that a photoconductor substrate having high surface quality can be obtained.

Claims (1)

[Claims] 1. Mg: 0.5-1.5% by weight, Z
n: 0.2-0.6%, and Mn: 0.05
0.4%, Cr: 0.05-0.2%, Zr: 0.0
Containing one or more of 5 to 0.2%,
u is 0.1% or less, Fe is 0.2% or less, and Si is 0.2% or less.
% Or less, Ti is regulated to 0.02% or less, B is regulated to 0.005% or less, and the balance consists of Al and other unavoidable impurities.