| 摘要 |
PURPOSE:To improve corrosion resistance and wear resistance by incorporating elements of >=1 kinds among at least Al, Cr and Ti into the 1st layer of protective films and essentially consisting the 2nd layer of the protective layers of Ni. CONSTITUTION:A ferromagnetic metal consisting of Co-20N is formed to 1,500Angstrom on, for example, a polyester film having 9mum thickness by mounting said polyester film to a vacuum deposition device, heating the Co-20Ni to evaporate in 5X10<-5>Torr vacuum, directing gaseous oxygen simultaneously to the vapor flow of the Co-20Ni at 200ml/min ratio and diagonally depositing the vapor thereof by evaporation on the film at 500Angstrom /sec deposition rate. Al is again heated to evaporate in 5X10<-5>Torr vacuum to form the 1st protective layer consisting of Al on the ferromagnetic metallic layer, following which Ni is heated to evaporate to form the 2nd layer of the protective films consisting of the Ni thereon. The polyester film 1 is thereafter cut to a prescribed width and the ferromagnetic metallic layer 2, the 1st layer 3 of the protective films, and the 2nd layer of the protective films are successively formed on said polyester film to prepare a magnetic tape. Such magnetic recording medium has the excellent corrosion resistance to corrosive gases and wear resistance.
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