Abstract
Some observations were made under metallurgical microscope or electron microscope on the surface of the substrates pretreated by various processes and on the initial deposit of iron-nickel alloy thin film.It was found that more suitable substrate surface for the basis of Fe-Ni alloy electroplating was obtained by thin copper electroplating than by mechanical or chemical polishing. Anomalous phenomena were observed at the early stage of Fe-Ni alloy electrodeposition. At the thickness of about 500A, the deposited film contained a large amount of iron and the crystals dispersedly appeared. At the thickness of above 1000A, the film approached to the average composition (Fe/Ni=20/80) with crystals of network structure.These anomalous phenomena were also proved by the measurement of change in cathodic potential and by the analysis of the composition of deposited film.
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