| 摘要 |
An oil cooler, which is a heat exchanger for prolonging the service life thereof, wherein an oil passage (113) allowing oil to pass through the inside thereof is formed of aluminum or aluminum alloy plates (111) and (112), a fin (123a) made of a material lower in corrosion potential than the plates (111) and (112) is disposed in a cooling water passage (123) through which cooling water exchanging heat with oil is passed, and a sacrificing layer (301) lower in corrosion potential than the plates (111) and (112) and fin (123a) is formed on the surface of the plates (111) and (112) positioned on the cooling water passage (123) side, whereby, because corrosion starts preferentially with the sacrificing layer (301), not only the plates (111) and (112) but also the fin (123a) can be protected and, as a result, the pressure resistant strength of the oil cooler can be maintained and the service life of a product can be prolonged.
|
