Applying amorphous Ni-Cu-P composite electroless plating as anticorrosion plating, the heat transfer performance of the fin-tube condensing heat exchanger processed by the plating-expanding-plating technology and the expanding-plating technology is experimentally studied. The application of the first technology can resolve the problem that the fin-root is easy to corrode, effectively reduce the contact heat resistance between the fin-root and the tube, and enhance the heat transfer performance of the heat e...