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Aluminium alloy material having an excellent sea water corrosion resistance and plate heat exchanger

A kind of aluminum alloy material, corrosive technology, used in indirect heat exchangers, heat exchanger types, heat exchange equipment and other directions, can solve the problems of poor adhesion of aluminum alloy materials, can not improve corrosion resistance, etc., to achieve high adhesion, The effect of improved adhesion and high seawater corrosion resistance

Inactive Publication Date: 2009-03-25
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0019] In this regard, as described in Patent Document 3 or Non-Patent Document 1, in the anti-corrosion method of directly providing a trifluoro resin anti-corrosion coating film on the surface of the aluminum alloy material, the adhesion to the aluminum alloy material is poor, and it is actually impossible. Practical aspects of improving corrosion resistance under seawater

Method used

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  • Aluminium alloy material having an excellent sea water corrosion resistance and plate heat exchanger
  • Aluminium alloy material having an excellent sea water corrosion resistance and plate heat exchanger

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Embodiment

[0071] Examples of the present invention are described below. The roughness of the 60 mm×60 mm 3003 aluminum alloy plate test piece was adjusted with a plate thickness of 1.0 mm so that the 10-point average roughness Rz of the surface was in the range of 0.3 to 5 μm. Next, on the surface of these test pieces, an organic phosphonic acid substrate film is coated, and further, a 5 μm thick fluororesin coating film composed of a trifluoro resin is provided on the film, and the coating film of the coating aluminum alloy material is evaluated. Adhesiveness and durability during high-temperature immersion. At the same time, the roughness was adjusted so that the 10-point average roughness Rz of the surface became 0.2 μm, and the coating film adhesion and high-temperature immersion were also evaluated for the comparative example coated aluminum alloy material that was subjected to the above-mentioned coating treatment. durability.

[0072] In the present invention, durability of coa...

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Abstract

An aluminium alloy material having an excellent sea water corrosion resistance comprises an aluminium alloy substrate whose ten-points average surface roughness Rz, which is the average of five greatest peak-to-valley separations on the surface, is controlled at 0.3 um or over, an organic phosphonic primer film formed on a surface of the aluminium alloy substrate, and a fluorine resin paint film formed on the primer film and having a dry average thickness of 1 to 100 mum. A plate heat exchanger having an excellent sea water corrosion resistance is also provided wherein the aluminium alloy material is used as a heat transfer unit using sea water as cooling water.

Description

technical field [0001] The present invention relates to an aluminum alloy material excellent in seawater corrosion resistance and a plate heat exchanger using the aluminum alloy material for a heat transfer part using seawater as cooling water. Background technique [0002] Since aluminum alloy has high specific strength and high thermal conductivity, it is commonly used as a material for small and light heat exchangers. Typical examples of heat exchangers using aluminum alloy materials are fin-and-tube heat exchangers used in household air conditioners and automobile radiators. In contrast, industrial plate heat exchangers that use seawater as cooling water generally use titanium, but the use of more economical aluminum alloys is being considered. [0003] Such a plate 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 is excellent in cor...

Claims

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Application Information

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IPC IPC(8): C23F11/00B32B15/082F28D9/00
CPCF28F21/084F28D9/00
Inventor 大胁武史漆原亘衣笠润一郎野一色公二
Owner KOBE STEEL LTD
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