JPS5983741A - Fin material for heat exchanger made of aluminum alloy having sacrificial corrosion-proof effect - Google Patents

Abstract

PURPOSE:To provide a fin material for a heat exchanger made of an aluminum alloy improved in sacrificial anodic effect, by a method wherein a coating material to be soldered such as an Al-Si base alloy is applied to one surface of a core material comprising an Al-Mn base alloy while the other surface thereof is coated with a coating material for a sacrificial anode comprising an Al-In base alloy. CONSTITUTION:An Al-Si or Al-Si-Mg base alloy is applied to one surface of a core material 1 made of an Al-Mn base alloy as a coating material 2 to be soldered while an Al-In base alloy is applied to the other surface thereof as a coating material 3 for a sacrificial anode. In forming this brazing sheet 1 into a corrugated fin shape by bending processing, a slit shaped through hole 4 for passing the solder material is provided to a part corresponding to each bent crest part by drilling. When this slit shaped sheet is processed to a corrugated fin to be connected to a tube member 5, the coating film 2 to be soldered is turned into the side of the sacrificial coating material 3 through the through hole 4 for passing the solder material and good soldering with the tube material 5 is achieved even on the surface in the side of the coating material 2.

Description

[Detailed Description of the Invention] This invention provides a fin material for an aluminum alloy heat exchanger;
In particular, brazing, which is assembled by using a plating sheet as the fin material and brazing it to the pipe material, has a sacrificial corrosion prevention effect used in specified aluminum alloy heat exchangers (Lachécou, evaporators, condensers, oil coolers, etc.) Regarding fin material with.

- In the heat exchanger described above, the idea of preventing corrosion of the pipe material that serves as the liquid passage through the sacrificial anode action of the fin material is known, and even when a plating sheet is used as the fin material, it has been known that Consideration has been given to using an aluminum alloy that has a sacrificial anode effect as the a material.

- For example, AI is a coating material with such a sacrificial anode effect.
-S i -Mg -Zn alloy is well known, and although this alloy does not cause problems when furnace brazing or immersion brazing, when vacuum brazing is used, brazing is moderately difficult. Since Zn rapidly evaporates and scatters, the electrode potential becomes high and the desired sacrificial anode effect is no longer achieved. For this reason, conventional plating sheets for fin materials used in vacuum brazing have been A.
For brazing made of an I-Si-Mg-In alloy, a skin material is generally used. However, even in the above case, the sufficient anticorrosive performance of In could not be exhibited because Si, which acts as a local cathode, was included in the skin material.

In view of the above-mentioned circumstances, the present invention aims to provide a fin material made of a flaizink sheet that has even better performance in terms of sacrificial anode effect, and furthermore, it is an object of the present invention to provide a fin material made of a flaizink sheet that can be bent into the state of a Kolke I fin. The object of the present invention is to provide a fin material that allows brazing on both sides without any problem when processed.

The fin material for an aluminum alloy heat exchanger having a sacrificial anticorrosion effect according to the present invention is made of a plating sheet, and includes Al-MnQ containing 5 to 1.5%.
Al-8i or Al containing a base alloy as a core material and containing 5 to 15% Si or 0.3 to 5% Mg on one side of the core material.
-31-For brazing made of Mg-based alloy, the skin material is A1-I containing InQ, 01 to 01% on the other side of the twisted concentric material.
It is characterized in that it has a structure in which each sacrificial anode skin material made of an n-based alloy is coated. Furthermore, when the frayed sheet having the above structure is bent in a meandering manner by corkate fin processing, a through hole for wax symmetry is bored in the corresponding portion that becomes the top of each bend. That is.

In addition, in this specification, "96" refers to "% by weight"
”.

The above Al-Mn based alloy used as the core material is A3003.
It is well known as an alloy, and brazing requires a high temperature strength that is easily deformed and able to withstand pressure from jigs, so a gold phase of 0.5 to 15% Mn is specified. It is something that will be done.

The alloy coated on one side of the core material as a skin material for brazing is also an extremely commonly used skin material for pre-zinc sheets.
i is an added main component that lowers the melting temperature and improves fluidity. If the content is less than 5%, fluidity will be poor and brazing will be difficult, and if the content is higher than 15%, plastic working will be difficult. When furnace brazing or immersion brazing is performed, the skin material for brazing is made of an Al-3i base alloy within the above range, but when used for vacuum brazing, vacuum brazing is used. In order to remove the oxide film that forms on the surface of the brazing filler metal in the atmosphere and to remove oxygen in the atmosphere, MgO is added as a Kenotar material.
, 3 to 15%. Here, if the Mg content is less than 0396, it is possible to fully realize the desired effect as a Genoku material, but if it exceeds 15%, it is meaningless, and on the contrary, brazing is ``Work'' is not a choice.

The Al-In based alloy used as the sacrificial anode coating material is, of course, coated to improve the sacrificial anticorrosion performance, and if the In content is less than 0.01%, it will not provide the desired excellent sacrificial properties. Since the anode effect cannot be expressed and the effect becomes excessive if it exceeds 0.01%, it is preferably contained within the range of 0.01 to 0.1%, particularly preferably about 0.03 to 0.07%. .

As shown in Fig. 1, the plating sheet for the fin material having the above-mentioned configuration has a core vJ (1) made of an AI-Mn base alloy on one side, and brazing is performed on one side of the core vJ (1) as an apparent (2).
Since the l-5i or Al-51-Mg-based alloy is coated on the other side with an Al-In-based alloy as the sacrificial anode skin material (3), the sacrificial anode skin material (3) exists. On the surface, it is impossible to directly braze this plating sheet (c) to a pipe material or the like. Therefore,
This invention solves this problem by the following means. That is, as shown in FIG.
- When IA+ is bent in a meandering manner into a corrugated fin, a slint-shaped waxy symmetrical through hole ( 4) shall be drilled. Then, as shown in Fig. 3, when processing this into a corrugated fin and joining it to the pipe material +51 +51 by brazing, the skin material (2) is brazed to the above-mentioned solder symmetrical through hole (
4) to the sacrificial anode skin material (3) side, and good brazing with the tube material (5) is achieved on the surface of the skin material (2) side as well.

In addition, by continuously forming the anti-corrosion holes (6) on both sides or at least one side of the wax symmetrical holes (4) as shown in FIG. Brazing is further advantageous in that in the bonded state, the corrosion protection provided by the sacrificial anode sheathing material (3) can be extended to the sacrificial anode sheathing material (2) side.

Now, to show a specific embodiment of the present invention, the fin material has A3003 alloy as the core material (1), and one side of the fin material has a Δ1
-10%5i-1%Mg alloy brazing material (
2) is coated with a cladding rate of 20%, and the other side is coated with KAI.
- Thickness 0.13 mm coated with sacrificial anode skin material (3) made of 0.05% In alloy with a ground ratio of 10%.
(to the praising sheet). And this praising sheet (A)K,
After drilling the wax symmetrical through hole (4) and the corrosion prevention through hole (6) in the manner shown in Figure 2, they are meandered into a full gate fin state as shown in Figure 3. Apply bending processing.

Therefore, when vacuum brazing is performed with this fin material (λ) interposed between the tube material 15+ +51 made of Al 100 alloy, for example, as shown in FIG. 3, the fin material (N) and the tube material +51 +51 The brazing can be firmly integrated with the skin material (2).

As mentioned above, the fin material according to the present invention has a core material coated on one side with a skin material made of an Al-In based alloy which itself has an excellent sacrificial anode effect. When used as an exchanger, the fin material serves as a sacrificial anode to protect the tube material side and effectively prevent corrosion therefrom. Of course, the other side of the core material is brazed with Al-8i or AI-Si as a skin material.
-Since it is coated with Mg-based alloy, it has a brazing function as a plating sheet, and
Furthermore, when the corrugated fin is bent into a corrugated fin, a through-hole for solder symmetry is drilled in the portion that becomes the bending top, so that the brazing material can also wrap around the sacrificial anode skin material side. Because of this, it is possible to join both sides of the fin material bent in a meandering shape by brazing.This can be fabricated into a corrugated fin state and pipe materials are joined and fixed on both sides of the corrugated fin material to assemble and manufacture a heat exchanger. However, this can be handled without any problems.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the fin material according to the present invention, Fig. 2 is a plan view of the fin material with wax symmetry holes and anti-corrosion holes drilled, and Fig. 3 is a corrugated fin processed into a pipe material. FIG. 3 is a cross-sectional view showing a joined state. (1) Core material, (2) Sheath material for brazing, (3
)...Skin material for sacrificial anode, (4)...Through hole for wax symmetry line. Above, Figure 1 224-

Claims (2)

[Claims] (1) A fin material for an aluminum alloy heat exchanger made of a pre-zinc sheet, in which the core material is an Al-1vfn-based alloy containing 5 to 15% of MnQ, and one side of the core material has a Si of 5 to 15%. Or even M' g -0,3~1
．． For brazing made of Δ]-5i or l\]-51-Mg-based alloy containing 5%, the skin material is on the other side of the concentric material,
A fin material for an aluminum alloy heat exchanger that seals a sacrificial anticorrosion effect, characterized in that it is each coated with a sacrificial anode skin material made of an Al-In based alloy containing inQ, 01 to 01%. (2) A fin material for an aluminum alloy heat exchanger made of a plazinc sheet, containing 3 to 1.5% MnO.
The core material is an Al-Mn-based alloy containing
For brazing made of Al-8i or △ Al-Si-Mg-based alloy containing 5 to 15% Si or even 0.3 to 15% Mg, the sheath material contains 0.01 to 15% In and the other side of the concentric material A containing 01%
The sacrificial anode skin material made of l-1, n-based alloy is coated, and when this pre-zinc sheet is bent into a meandering shape by corrugate fin processing, a brazing material is applied to the corresponding portion that becomes the top of each bend. A fin material for an aluminum alloy heat exchanger that has a sacrificial corrosion prevention effect and is characterized by having transition holes drilled therein.