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Aluminum alloy with high seawater corrosion resistance and plate-fin heat exchanger

一种铝合金材料、热交换器的技术，应用在热交换设备、金属材料涂层工艺、薄料处理等方向，能够解决铝合金材料密接性差、无法实质性地提高耐腐蚀性的实用性等问题，达到耐海水腐蚀性优良的效果

Inactive Publication Date: 2008-06-04
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] In this regard, if it is the anti-corrosion method of directly providing a trifluoride resin anti-corrosion coating film on the surface of the aluminum alloy material like the above-mentioned patent document 3 or non-patent document 1, the adhesion with the aluminum alloy material is poor, and there is a problem. The practical problem of not being able to substantially improve the corrosion resistance under seawater conditions

Method used

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Examples

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Embodiment

[0063] Embodiments of the present invention will be described below. On the surface of an aluminum alloy plate test piece with a plate thickness of 1.0 mm and a thickness of 200×200 mm, an organic phosphonic acid base film is provided, and then a fluorine-containing resin coating film composed of a trifluorinated resin with a thickness of 1 to 100 μm is provided on it. The coating film adhesion of aluminum alloy coated materials was evaluated. At the same time, the adhesion of the coating film was also evaluated for the comparative example coated aluminum alloy material. These results are shown in Table 1.

[0064] In the present invention, the durability of coating film adhesion, which is the life of the coating film, was evaluated as seawater corrosion resistance. Furthermore, as disclosed in Patent Document 3, there is also a method of evaluating the corrosion resistance of the fluorine-containing resin coating film itself by measuring the change over time in the corrosio...

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Abstract

An aluminum alloy for use in a plate-fin heat exchanger having a heat transfer portion with seawater as a coolant includes an organic phosphonic acid underlying coating disposed on the surface of the aluminum alloy and a fluorocarbon resin coating disposed on the organic phosphonic acid underlying coating, the fluorocarbon resin coating having an average thickness of 1 to 100 µm after drying. The aluminum alloy has improved durability of coating adhesion and excellent seawater corrosion resistance.

Description

technical field [0001] The present invention relates to an aluminum alloy material excellent in seawater corrosion resistance and a fin-type heat exchanger using it in a heat transfer part using seawater as cooling water. Hereinafter, aluminum is also referred to as Al. Background technique [0002] Aluminum alloys are widely used as materials for small and light heat exchangers because of their high specific strength and high thermal conductivity. Typical examples of heat exchangers using aluminum alloy materials are fin and tube heat exchangers used in household air conditioners, car radiators, and the like. In industrial fin heat exchangers that use seawater as cooling water in contrast to titanium, studies are being made to use more economical aluminum alloys. [0003] Such a finned heat exchanger having a heat transfer portion using seawater as cooling water is exposed to a severe corrosive environment when used in a seawater environment. Therefore, titanium, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F15/00C09D127/12F28F19/02
CPCC23C28/00F28F21/084C23F11/1676C09D5/086F28F19/04C23C28/04Y10T428/263
Inventor 大胁武史小林宣裕野一色公二
Owner KOBE STEEL LTD
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