The Studies Of Structure And Properties Of Electrodeposited Nano Fe-Ni Alloys And Amorphous Fe-Ni-W Alloys

The electroplating industry has taken on a new look with the introduction of nano-technology. As compared with the traditional alloy deposits, the nano alloy deposits own many superior properties in microhardness, corrosion resistance, magnetism, wear resistance and et al. The electrodeposition of nano materials has been making significant influence on the electroplating industry. Therefore, to study the structures and properties of the nano alloy deposits is of great value.In this paper, Nano Fe-Ni alloys and amorphous Fe-Ni-W alloys (Wwt%=35%) have been obtained by electrodeposited. The micro-morphology and micro-structure of Fe-Ni alloys or Fe-Ni-W alloys were studied by SEM, XRD and DSC, respectively.The effects of micro-structure on the properties were also discussed. The detailed research work was as follows:(1)The nano Fe-Ni alloys were electrodeposited from sulfate system,the size of Fe-Ni is about 20-60 nm.For the first time,the corrosion behaviour of electrodeposited nano Fe-Ni alloys in different medias were systematically studied by different methords. The results showed that the nano Fe-Ni alloys own good corrosion resistence.(2)For the first time, the micro-structure of amorphous Fe-Ni-W (Wwt%=35%) at different temperatures,The experimental results showed that when heat treatment temperature is below 400℃, the amorphous structure of deposit was still preserved; When heat treatment temperature is in range of 450~600℃, parts of nano-crystal structure in deposit produced, mixture of amorphous plus nano-crystal structure obtained which has some interesting properties; When heat treatment is above 600℃the nano-crystal structure of deposit is obtained. the effect of structure on micro-hardness,corrosion resistence were systematically studied .(3)The effect of boric on current efficiency, composition, microhardness, corrosion resistence of electrodeposited Fe-Ni-W alloys were studied.the composition of deposit was influced mainly due to the adjusting ability of boric acid.The inner-stress can be eliminated by increasing boric acid,and the micro-crack decreased.This caused the micro-hardness of Fe-Ni-W alloys decreased and the corrosion resistence increased.