| 摘要 |
PURPOSE:To invent a plating process of a vertically magnetized film with excellent coersive characteristics and appearance applicable to a magnetic drum, etc., of a magnetic encoder by a method wherein the magnetized film is electrolyzed in specific current density (e) in an electrolyte containing respective specific quantities of cobalt chloride, sodium hypophosphite, ammonium chloride and specific non-ionic interfacial active agent. CONSTITUTION:In an electrolyte containing 80g/l-200g/l of cobalt hexa hydrochloride, 40g/l-90g/l of sodium hypophosphite, 80g/l-150g/l of ammonium chloride and 0.04g/l-2g/l of non-ionic interfacial active agent containing both of ether coupled group and hydroxyl group, a magnetic film is electrolyzed in mean current density of 2A/dm<2>-8A/dm<2>. Through these procedures, the magnetic film even if it is thick in notable magnetic anisotropy in the vertical direction from the film surface with powerful coersive force (a) and in excellent square ratio and appearance can be formed and when it is applied to a magnetic drum, etc., of a magnetic encoder, an encoder with high resolving power can be manufactured. Furthermore, powerful coersive force is given to the plated film to be hardly demagnetized so that the highly reliable magnetic encoder hardly affected by any outer magnetic noise subjected to less time- elapsing deterioration may be manufactured.
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