Abstract: This paper studied corrosion behavior of plating foils depending upon the technic condition of amorphous Fe-Ni-P alloy electrodeposition. In acid solutions, the Tafel polarization curves were measured. The results indicated that the amorphous Fe-Ni-P alloy coating had better corrosion resistance behavior. After attached in HC1 solution, the electroplating foil was researched with AC impedance system for corrosion process.