| 摘要 |
Oil passages 113 through which oil passes are formed with plates 111, 112 composed of aluminum or an aluminum alloy in an oil cooler, according to the present invention, that is a heat exchanger with an extended life. Moreover, fins 123a composed of a material having a corrosion potential more negative than those of the plates 111, 112 are arranged in cooling water passages 123 through which cooling water, for exchanging heat with oil, passes. A sacrificial corrosive layer 301 having a corrosion potential more negative those of the plates 111, 112 and the fins 123a is formed on each of the surfaces on the sides of the cooling water passages 123 of the plates 111, 112. As a result, the sacrificial corrosive layer 301 is preferentially corroded, and not only the plates 111, 112 but also the fins 123a can be protected. Consequently, the pressure-proof strength of the oil cooler can be maintained, and the product life can be improved.
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