A novel process of electroplating amorphous Fe-Cr-Ni alloy in chloride aqueous solution with Fe ( Ⅱ) , Ni( Ⅱ) and Cr ( Ⅲ) was reported. Couple plasma atomic emission spectrometry ( ICP-AES) , X-ray diffractometry (XRD) ,scanning electronic microscopy (SEM), microhardness test and rapid heating-cooling method were adopted to detect the properties of the amorphous Fe-Ni-Cr deposit , such as composition , crystalline structure ,micrograph , hardness , and adherence between deposit and substrate. The effects of the operating parameters on the electrodeposit of the amorphous Fe-Ni-Cr alloy were discussed in detail. The results show that a 8.7μm thick mirror-like amorphous Fe-Ni-Cr alloy deposit ,with Vicker’s hardness of 530 and composition of 45 %~55 % Fe , 33 %~37 % Ni , 9 %~23 % Cr was obtained by electroplating for 20 min at room temperature (10~30 ℃) , cathode current 10~16 A/ dm2 , pH = 1. 0~3. 0. The XRD patterns show that there only appears a broad hump around 2θof 41°~47°for the amorphous Fe-Ni-Cr alloy deposit , while
the SEM micrographs show that the deposit contains only a few fine cracks but no pinholes.