JP2003286583A - Fin material made of aluminum for heat exchanger and fin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fin material made of aluminum which is excellent in heat resistance and in which discoloration of a surface treated film is suppressed even if it is thermally affected during a manufacturing process of a tube heat exchanger with a plate fin, and at the same time, hydrophilicity can be sufficiently secured, and a fin using the same. <P>SOLUTION: In the fin material made of aluminum for the heat exchanger in which a film having corrosion resistance and a film having hydrophilicity are successively laminated on at least one face of an aluminum plate or an aluminum alloy plate from the plate side, the film having corrosion resistance contains Cr or zirconium Zr as the main component, and at the same time, contains P of 10 mg/m<SP>2</SP>or less, the film having hydrophilicity is constituted of a composite film containing colloidal silica and an organic resin, and it is constituted as the fin material made of aluminum for the heat exchanger whose amount of the film is 200-800 mg/m<SP>2</SP>in terms of an SiO<SB>2</SB>amount. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin material for a heat exchanger composed of a surface-treated aluminum plate or aluminum alloy plate, and a fin using the fin material.

[0002]

2. Description of the Related Art Conventionally, as a fin for a heat exchanger of a room air conditioner, a package air conditioner or the like, a plate material generally made of aluminum or aluminum alloy (hereinafter collectively referred to as "aluminum plate") from the viewpoint of thermal conductivity and workability. Has been used. In order to improve the fin performance of a heat exchanger composed of such an aluminum plate, it has been developed and put into practical use that has been given a desired hydrophilicity, corrosion resistance, etc., and various coatings on its surface. Has been done.

By the way, as a heat exchanger most commonly used in the conventional room air conditioners and package air conditioners, there is a so-called plate finned tube heat exchanger. The tube heat exchanger with plate fins is configured to include plate fins mainly made of an aluminum plate and heat transfer tubes mainly made of copper. Such a tube heat exchanger with plate fins is assembled through the following manufacturing process, for example.

First, a plate fin material mainly made of an aluminum plate is coated with volatile press oil and press-worked to manufacture an aluminum plate fin having a plurality of predetermined assembly holes. . Next, a separately produced hairpin-shaped heat transfer tube mainly made of copper is inserted into the assembly hole, expanded, and fixed.

Subsequently, the aluminum plate fins incorporating the heat transfer tubes are inserted into a hot air oven and heated to a predetermined temperature to volatilize the volatile oil adhering to the aluminum plate fins. Further, a U-bend heat transfer tube is arranged in the opening of the hairpin-shaped heat transfer tube, and the U-bend heat transfer tube is brazed and joined using a gas burner. After that, the heat exchanger thus assembled is immersed in a water tank to inspect whether the airtightness of the heat transfer tube is secured. Then, after the inspection, the heat exchanger is inserted into a hot air oven and dried.

The conventional aluminum plate fin thus manufactured is exposed to a relatively high temperature due to the heat transferred from the heat transfer tube made of copper when heating or brazing in the hot air stove. Be done. As a result, the coating film formed on the surface of the aluminum plate included in the aluminum plate fin may be discolored, and the hydrophilicity may be deteriorated. Such a phenomenon is not preferable because it not only impairs the performance of the heat exchanger in which the aluminum plate fins are arranged, but also causes a poor appearance and reduces the commercial value.

Therefore, even if the aluminum plate fin is exposed to a high temperature due to the influence of heat, it is possible to prevent discoloration of the hydrophilic film formed on the surface of the aluminum plate and to improve its hydrophilic performance. There is a demand for an aluminum material in which a film capable of suppressing the deterioration is formed by surface treatment.

As a conventional method for forming a hydrophilic film on an aluminum plate by surface treatment, for example, (1) boehmite treatment, (2) coating containing water glass (alkali silicate) as a main component, (3) water glass And a coating containing a hydrophilic group-introduced organic resin as a main component, (4) coating including a hydrophilic group-introduced organic resin as a main component, and (5) coating including a colloidal silica and an organic resin as a main component. The surface treatment method of applying is mentioned.

[0009]

However, the above (1)
In the surface treatment method of boehmite treatment and (2) coating with water glass (alkali silicate) as the main component, the component forming the film formed on the surface of the aluminum plate is an inorganic substance, so it has excellent heat resistance. That is hydrophilic, especially
The hydrophilicity after applying the volatile press oil and heating and drying was not sufficient.

Further, (3) coating mainly composed of a mixture of water glass and an organic resin having a hydrophilic group introduced therein, (4) coating mainly composed of an organic resin having a hydrophilic group introduced therein, and (5) In the surface treatment method of applying the coating mainly composed of colloidal silica and organic resin, the organic matter is contained in the surface treatment film formed on the surface of the aluminum plate, so it may be exposed to a relatively high temperature or may be heated depending on the time. However, there is a problem that the surface-treated film is discolored or the hydrophilicity is lowered.

The present invention was created in order to solve the above-mentioned problems, and its purpose is to provide excellent heat resistance and to provide a surface even if it is thermally affected in the manufacturing process of a plate finned tube heat exchanger. An object of the present invention is to provide a fin material made of aluminum, in which discoloration of a treated film is suppressed and hydrophilicity is sufficiently ensured, and a fin using the fin material.

[0012]

Means for Solving the Problems The inventors of the present invention have found that a coating having corrosion resistance and a coating having hydrophilicity containing colloidal silica and an organic resin are sequentially laminated on the surface of an aluminum plate or an aluminum alloy plate. A film was formed and earnestly studied on the relationship between the structure of the laminated film and heat resistance. As a result, the components in the coating having corrosion resistance formed on the surface of the aluminum plate or the aluminum alloy plate contribute greatly to the heat resistance, and further, the coating having hydrophilicity laminated on the coating having corrosion resistance. It was found that the heat resistance can be greatly improved by configuring the above with a composite film containing colloidal silica and an organic resin, and completed the present invention.

That is, the present invention relates to an aluminum fin material for a heat exchanger, in which a coating having corrosion resistance and a coating having hydrophilicity are sequentially laminated on at least one surface of an aluminum plate or an aluminum alloy plate from the plate side, The corrosion-resistant film is mainly composed of chromium (Cr)
Or together containing zirconium (Zr), containing phosphorus (P) 10mg / m ² or less, the film having the hydrophilic, is a composite film containing colloidal silica and an organic resin, the coating amount of SiO ₂ 200 in quantity conversion
It was constituted as a fin material made of aluminum for a heat exchanger, which is about 800 mg / m ² . (Claim 1) According to this structure, the fin material made of aluminum for a heat exchanger, in which discoloration of the hydrophilic film and the like is suppressed and deterioration of hydrophilicity is suppressed even when exposed to a relatively high temperature Is realized.

The present invention also provides an aluminum fin material for a heat exchanger, in which a coating having corrosion resistance and a coating having hydrophilicity are sequentially laminated on at least one surface of an aluminum plate or an aluminum alloy plate from the plate side, The corrosion resistant film is composed of an organic film containing no phosphorus (P), the hydrophilic film is composed of a composite film containing colloidal silica and an organic resin, and the amount of the film is converted into the amount of SiO ₂ . The heat-exchanger fin material may be 200 to 800 mg / m ² in aluminum. (Claim 2)

According to this structure, in the aluminum fin material for heat exchangers, the film having corrosion resistance is
For example, since it is composed of an organic film that does not contain P, even if the film thickness of the corrosion-resistant film is made thicker than that of claim 1, discoloration of the hydrophilic film or the like can be suppressed.
As a result, an aluminum fin material for a heat exchanger, in which the hydrophilicity, corrosion resistance and press formability required for the heat exchanger fin are sufficiently ensured and the corrosion resistance is further enhanced, is realized.

The present invention is configured as an aluminum fin using the aluminum fin material for a heat exchanger according to claim 1 or 2. According to this structure, a fin made of an aluminum fin material for a heat exchanger, which suppresses discoloration even when exposed to a relatively high temperature and suppresses deterioration in hydrophilicity, is realized.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. The aluminum fin material for a heat exchanger excellent in heat resistance according to the present invention includes an aluminum plate or an aluminum alloy plate as a substrate material, and Cr or Zr as a main component on at least one surface of the plate from the plate side.
A laminated film in which a film having corrosion resistance containing (hereinafter referred to as "corrosion resistant film") and a film having hydrophilicity containing a predetermined amount of colloidal silica and an organic resin (hereinafter referred to as "hydrophilic film") are sequentially laminated. It is configured to include. The conditions necessary for the present invention will be described below.

[Aluminum Plate or Aluminum Alloy Plate] The aluminum plate or aluminum alloy plate used in the present invention (hereinafter collectively referred to as “aluminum plate”) is
The type is not limited, and any material that can be applied as a fin material for a heat exchanger can be used. As such an aluminum plate, for example,
Pure aluminum-based 1000 or Al-Mn-based 30
00 series alloy (above, JIS H4000) etc. can be used.

The aluminum plate used in the present invention is not limited in its production method, and may be produced by a conventionally known production method. For example, first, aluminum having a composition according to the present invention according to a conventional method. Alternatively, an ingot of an aluminum alloy is produced, and homogenized heat treatment is applied to this ingot, followed by hot rolling, and subsequently, if necessary, subjected to an annealing treatment and then a cold rolling treatment. ,
The aluminum plate used in the present invention can be manufactured.

[Corrosion-Resistant Coating] In the present invention, the corrosion-resistant coating is formed on at least one surface of such an aluminum plate as follows. First, a corrosion-resistant film is formed on one surface (the surface on which a hydrophilic film described below is formed) or the entire surface of the bare material of the aluminum plate that has been degreased (hereinafter referred to as “aluminum base plate”). This corrosion-resistant film must have good adhesion to the hydrophilic film laminated thereon, and further contains Cr or Zr as the main component, and P in the corrosion-resistant film.
Content of 10 mg / m ² or less is required.

In general, when a corrosion-resistant coating containing P and a hydrophilic coating containing a resin component are laminated on a substrate, the coating is heated to a temperature higher than the thermal decomposition point of the resin component to give a yellow color. The color changes to taste.

The present inventors have found that the P compound, which is the origin of the P, is involved in the thermal decomposition of the resin component, and the thermal decomposition rate of the resin component changes according to the content of the P compound. When the content of the compound is a certain value or more, that is, when it exceeds a certain threshold value, a non-linear change is caused in the properties such as hydrophilicity of the hydrophilic film, the degree of discoloration of the hydrophilic film, the hydrophilicity, etc. I assumed that it would change greatly.

Then, the inventors of the present invention have conducted a detailed investigation on such an assumption. As a result, the discoloration of the aluminum fin material for heat exchanger in which the corrosion resistant coating and the hydrophilic coating are laminated on at least one surface of the aluminum base plate. The content of P in the corrosion-resistant coating is 10 mg / m ²
It was found that there is a remarkable change with the boundary point. That is, when the content of P in the corrosion resistant coating is 10 mg / m ² or more, the degree of discoloration becomes significantly large when the resin component contained in the hydrophilic coating is heated to a high temperature,
It was also revealed that the hydrophilicity was also reduced. Therefore, in the present invention, the content of P in the corrosion resistant coating is set to 10
It was decided to limit the dose to less than mg / m ² .

As the corrosion resistant film, a general, for example, chemical conversion treatment film of phosphoric acid chromate containing Cr in the film is suitable. The chemical conversion treatment film of phosphoric acid chromate has CrPO as the main component. since containing ₄ · 4H ₂ 0, as the film thickness of the film increases, so that the content of P increases. Therefore, when forming a chemical conversion treatment film of phosphoric acid chromate on the aluminum plate, it is necessary to make the film thickness such that the P content in the corrosion resistant film does not exceed the range regulated by the present invention. Is.

In the present invention, as the chemical conversion treatment film other than the phosphoric acid chromate, a chromate chromate conversion treatment film, a Zr-based chemical conversion treatment film, or a water-soluble resin and a Cr compound or Zr compound. It is possible to appropriately select and use a coating type treatment film which forms a coating by coating the treatment liquid containing it and drying it, or a coating type treatment film which does not contain P.

If the corrosion resistant coating contained in the aluminum fin material for the heat exchanger according to the present invention is constituted by such a coating treatment film containing no P, the chemical conversion treatment of the above P-containing chromate phosphate. As compared with the case where a film is applied, even if the film is formed thicker, the discoloration of the hydrophilic film or the like is suppressed and the corrosion resistance can be further improved.

Further, in the present invention, it is possible to use an organic film containing no P in place of the above corrosion resistant film. The organic film containing no P contained in the present invention is not particularly limited as long as it has good adhesion to the hydrophilic film laminated thereon, and for example, an epoxy-modified acrylic coating is applied. can do.

[Hydrophilic coating] In the present invention, after the corrosion resistant coating is formed on one surface or the entire surface of the aluminum base plate, hydrophilicity is imparted to the surface (at least one surface) on which the corrosion resistant coating is formed. Therefore, a hydrophilic film is formed. In the present invention, the hydrophilic film is composed of a composite film containing colloidal silica and an organic resin, and the amount of the film is 200 to 800 mg in terms of SiO ₂ amount.
/ M ² .

The reason for this is that the amount of film formed by coating the aluminum base plate is 200 mg / in terms of the amount of SiO _2.
If it is less than m ² , sufficient hydrophilicity cannot be obtained as a fin material for a heat exchanger, and the coating amount is 80 in terms of SiO ₂ amount.
When it is more than 0 mg / m ² , the silica in this coating is a relatively hard substance, so that the wear of the tool used for forming the fin material is significantly accelerated, which is not preferable.

The hydrophilic film containing the colloidal silica and the organic resin can be formed by using a paint containing both of them, and this paint is generally water-dispersible silica (a), water-soluble or water-dispersible. The organic resin (b), the crosslinking agent (c) of the above (a) or (b), the surfactant (d), the antibacterial agent (e), and the like.
In the present invention, the blending ratio of the water-dispersible silica (a) and the water-soluble or water-dispersible organic resin (b) contained in the coating material is not particularly limited and is appropriately set. However, usually, the mass percentage ratio of the solid content in the coating material can be in the range of 40:60 to 90:10. In the present invention, a treatment agent for forming a composite film containing the colloidal silica and the organic resin is disclosed in, for example, JP-A-55-99976 and JP-B-6-43579. It is possible to use the existing one.

[0031]

EXAMPLES Next, an aluminum fin material for a heat exchanger according to the present invention and a fin using the same will be described in comparison with a comparative example which does not satisfy the conditions required in the present invention. In this embodiment, as an aluminum base plate, a H24-treated pure aluminum-based 120 having a plate thickness of 0.10 mm and defined by JIS A1200.
A 0 (JIS H4000) aluminum plate subjected to alkali degreasing treatment with Surf Cleaner 360 (manufactured by Nippon Paint Co., Ltd.) as a pretreatment was used.

Then, on the entire surface of the aluminum base plate,
Various corrosion resistant coatings and various hydrophilic coatings are appropriately combined, and the corrosion resistant coatings and the hydrophilic coatings are sequentially laminated from the plate side to various aluminum fin materials for heat exchangers (Examples Nos. 1 to 18, Comparative example Nos. 1 to 8)
Was produced. Table 1 below shows the types of corrosion-resistant coatings, and the content of P in this coating, Table 2 shows the types and constituent amounts of hydrophilic coatings, and Table 3 below.
Table 4 shows the conditions when the various coatings shown in Tables 1 and 2 were sequentially laminated on the entire surface of the aluminum base plate.

The corrosion resistant film was formed by subjecting the aluminum base plate to chemical conversion treatment by spraying with a commercially available chemical or coating type treatment with a roll coater method using a commercially available chemical. In addition, the hydrophilic film is formed by applying a composite coating containing colloidal silica and an organic resin (Cosmer manufactured by Kansai Paint Co., Ltd.) by a normal roll coater method, and then applying a baking treatment for 15 seconds. is there.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

[Table 3]

[0037]

[Table 4]

Example No. 3 of the aluminum fin material for the heat exchanger according to the present invention produced under the film forming conditions shown in Tables 3 and 4. Comparative Examples Nos. 1 to 18, which do not satisfy the requirements of the present invention. For 1 to 8, the following hydrophilicity, heat resistance, corrosion resistance, press moldability and tool wear resistance were evaluated.

(Hydrophilicity evaluation) For hydrophilicity evaluation, the following dry-wet cycle test was conducted assuming the case where the operation is switched from cooling operation to heating operation in a heat pump type air conditioner. First, each test material of the above-mentioned Examples and Comparative Examples was exposed to running water for 8 hours, and then dried at 80 ° C. for 16 hours as one cycle, and this operation was performed for 5 cycles. Next, 1 on the surface of each test material
Hydrophilicity was evaluated by dropping microliters of water drops and measuring the contact angle of the water drops with a goniometer. In addition, such measurement of the contact angle of the water droplet is a method generally used in evaluating hydrophilicity in various materials, and generally, the smaller the contact angle of the water droplet, the better the hydrophilicity.

(Heat Resistance Evaluation) As the heat resistance evaluation, the following heating test was carried out assuming heat received in the heat treatment in the manufacturing process of the plate finned tube heat exchanger. First, each of the test materials of the above-mentioned examples and comparative examples was inserted into a drying furnace and heat-treated at 200 ° C. for 30 minutes. Then, with respect to each of the test materials, the degree of discoloration of the surface was visually observed, and the contact angle of the water droplet was measured in the same manner as described above to evaluate the hydrophilicity. The heat resistance evaluation based on the degree of discoloration is "◎ (extremely good)" on the surface of the test material where no discoloration occurs at all, "○ (good)" when the color is very slightly discolored, Those that were discolored but had no problem in quality were evaluated as “Δ (generally good)”, and those that were significantly discolored were evaluated as “x” (bad), and evaluated according to the four-level evaluation criteria.

(Evaluation of Corrosion Resistance) For the evaluation of corrosion resistance, JIS Z2371 was applied to each of the test materials of the above-mentioned Examples and Comparative Examples.
Evaluation was carried out by conducting a salt spray test prescribed in 1. That is, after predetermined salt water was continuously sprayed on each of the test materials for 200 hours, the state of corrosion on the surface of each of the test materials was visually observed and evaluated. In this corrosion resistance evaluation, on the surface of the sample material, "○ (excellently good)" indicates that no corrosion has occurred, and "○ (good)" indicates that slight corrosion occurs. "△ (generally good)" indicates slight corrosion but no quality problem, and "x (poor)" indicates overall corrosion.
As a result, the evaluation was performed according to a four-step evaluation standard.

(Evaluation of Press Formability) For the evaluation of press formability, first, a fin press die (a drawless type die manufactured by Hidaka Seiki Co., Ltd.) was used, and the press conditions shown in Table 5 below were used. Each sample material of Examples and Comparative Examples is press-molded into a fin shape for a heat exchanger,
The state of image sticking on the inner surface of the color after pressing 10,000 times and the color shape were observed and evaluated. And, if there is no sticking of the inner surface of the color,
(Extremely good) ", the one with slight image sticking on the inner surface of the color is" ○ (good) ", and the one with image sticking on the inner surface of the color but with no quality problem is" △ "
"(Approximately good)", the case where the seizure of the inner surface of the collar was entirely generated, the collar was cracked, and peeling occurred in a part of the film was evaluated as "x (bad)".

In addition, as the evaluation criteria of the color shape, the case where no defects such as buckling, color cracks, or color jumps occurred at all was designated as "⊚ (normal)", and the above defects were slightly generated. Those that do not pose a quality problem are marked with "○ (almost normal)" and those that have the above-mentioned defects but which do not pose a functional problem are marked with "△ (generally good)", and the above-mentioned defects are relatively numerous What has occurred is "x (bad)"
And In addition, the unit spm (Stroke Per Mi of the press forming speed in the fin press forming die in Table 5).
nutes) means the quantity that can be processed in 1 minute.

[0044]

[Table 5]

(Evaluation of Tool Abrasion Property) For the evaluation of the tool abrasion property, an abrasion tester equipped with a piercing punch made of low carbon soft steel was used under the press conditions shown in Table 6 below. 20 holes were drilled in each of the test materials of Examples and Comparative Examples.
After tens of thousands of times, the shoulder portion of the piercing punch was observed with a scanning electron microscope to evaluate the degree of wear. And if the pierce punch has very little wear,
(Extremely good) ”, and those with relatively little wear are“ ○ ”
(Good) ", the degree of wear was clearly confirmed, but still usable was evaluated as" △ (generally good) ", and when the degree of wear was remarkably large," x (poor) "was evaluated. . The evaluation results according to each of the above evaluation criteria are summarized in Tables 7 and 8 below.

[0046]

[Table 6]

[0047]

[Table 7]

[0048]

[Table 8]

As shown in Table 7, Example No. 1 which satisfies the requirements of the present invention. Comparative Examples Nos. 1 to 18 in which the discoloration does not satisfy the requirements of the present invention. It is better than 1 to 7. In addition, Example No. Nos. 1 to 18 are also excellent in hydrophilicity, corrosion resistance, press moldability, and tool wear resistance.

On the other hand, Comparative Example No. 1 which does not satisfy the requirements of the present invention. It can be seen that 1 to 8 are inferior to the above examples in the following points. That is, Comparative Example No. 1,
Comparative Example No. In Nos. 5 to 7, it is considered that the heat resistance is lowered because the content of P in the corrosion resistant film is too large. Comparative Example No. In 2, since the amount of hydrophilic film is too small,
Sufficient hydrophilicity and corrosion resistance are not obtained. Comparative Example N
o. 3 and Comparative Example No. In No. 4, since the amount of the hydrophilic film is too large, seizure occurs on the inner surface of the collar during press molding to cause buckling of the collar, resulting in deterioration of press formability and wear of the tool. There is a problem that the degree of is increased. Then, in Comparative Example No. In 8,
Since no coating having corrosion resistance is provided, the corrosion resistance is reduced.

In this example, the corrosion-resistant coating (corrosion-resistant coating) and the hydrophilic coating (hydrophilic coating) included in the present invention were used as a substrate material of pure aluminum 1200 (JIS H4000) aluminum. A plate was used, and the corrosion-resistant film and the hydrophilic film were formed on the entire surface of the plate, but the present invention is not limited to such examples, and may be appropriately performed as long as it is based on the technical idea of the present invention. It is possible to change. For example, in the present invention, the pure aluminum-based 12 is used as the substrate material.
In addition to 00, Al-Mn-based 3000 series alloys (above, JI
SH 4000) can be used, and it is also possible to laminate the above-mentioned corrosion resistant coating on all or the entire surface of only one side or both sides of these pure aluminum plates or aluminum alloy plates and a hydrophilic coating on this corrosion resistant coating. .

[0052]

According to the present invention constructed as described above, the following effects can be obtained. That is, according to the first aspect of the present invention, even if the film is subjected to the thermal influence in the heat treatment when manufacturing the tube heat exchanger with plate fins, the discoloration of the hydrophilic film or the like formed by the surface treatment. Is suppressed, the hydrophilicity, corrosion resistance and press formability required for heat exchanger fins are sufficiently secured, and the degree of wear of tools used for forming aluminum fins for heat exchangers is low. An aluminum fin material for a heat exchanger that can be suppressed can be provided.

According to the invention of claim 2, the corrosion-resistant film is composed of a chemical conversion treatment film that does not contain P. Therefore, the corrosion-resistant film as in claim 1 is P
Compared with the case of a chemical conversion treatment film containing, even if the thickness of this film is made thicker, discoloration of the hydrophilic film is suppressed, and as a result, it is required in the heat exchanger fin. It is possible to provide an aluminum fin material for a heat exchanger, in which sufficient hydrophilicity, corrosion resistance and press formability are ensured, tool wear resistance is suppressed, and corrosion resistance is further improved.

According to the third aspect of the present invention, the fins for the heat exchanger, which are made of an aluminum fin material which suppresses discoloration of the hydrophilic film and the like and have desired hydrophilicity, corrosion resistance and press formability, are provided. Can be provided.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C23C 22/28 C23C 22/28 22/56 22/56 22/83 22/83 F25B 39/02 F25B 39 / 02 V F28F 1/32 F28F 1/32 H 13/18 13/18 B 19/06 19/06 C (72) Inventor Takahiro Shimizu 15 Kinugaoka, Moka City, Tochigi Prefecture Kondo Steel Works Moka Factory F Term (reference) 4J038 AA011 EA011 HA411 HA446 KA20 NA03 NA06 NA14 PB06 PC02 4K026 AA09 BA01 BA06 BA07 BA12 BB02 BB08 CA18 CA20 CA23 CA39 CA41 DA02 DA03 DA06 DA11 EB08 EB11

Claims (3)

[Claims] 1. An aluminum fin material for a heat exchanger, comprising a laminated film in which a film having corrosion resistance and a film having hydrophilicity are sequentially laminated from at least one surface of an aluminum plate or an aluminum alloy plate, The coating having corrosion resistance contains chromium or zirconium as a main component and contains phosphorus at 10 mg / m ²
The hydrophilic coating, which is contained below, is composed of a composite coating containing colloidal silica and an organic resin, and the coating amount is SiO 2.
Aluminum fin material for a heat exchanger, which is 200 to 800 mg / m ² in terms of ₂ amount. 2. An aluminum fin material for a heat exchanger, comprising a laminated film in which a film having corrosion resistance and a film having hydrophilicity are sequentially laminated on at least one surface of an aluminum plate or an aluminum alloy plate from the plate side. The coating having corrosion resistance is composed of an organic coating containing no phosphorus, the coating having hydrophilicity is composed of a composite coating containing colloidal silica and an organic resin, and the coating amount is SiO 2.
Aluminum fin material for a heat exchanger, which is 200 to 800 mg / m ² in terms of ₂ amount. 3. An aluminum fin, wherein the aluminum fin material for a heat exchanger according to claim 1 or 2 is used.