| 摘要 |
PURPOSE:To improve corrosion resistance and durability by a method wherein the surface of heat exchanging member is formed with the coating layer of paint consisting of the binder of polymer of organic silicon having the main constituent of polyborosiloxane and metal powder having melting point lower than the calcine temperature of the binder and dispersed into and mixed with the binder. CONSTITUTION:The surface of the heat exchanging member 5 is treated with the coating layer 6 of paint consisting of the binder of polymer of organic silicon having main consituent of polyborosiloxane with the skeleton of silicon, carbon, boron or oxygen and metal powder having a melting point lower than the calcine temperature of the binder and dispersed into the binder. Accordingly, the layer has a prominent heat resistance and durable sufficiently against the using temperature of the heat exchanger. The calcining temperature of the organic silicon polymer is different depending on the base material and catalyst (reaction and curing agent), however, it is calcined normally at the temperature of 400 deg.C for the degree of 60min to obtain the predetermined property of caoting film. Accordig to this method, prominent corrosion resistance and durability may be obtained for a long period to time. |
