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Effect of Additive Elements on Electrochemical Behavior of Passive Films on Fe-18Cr Alloy
Fujimoto, S.,Umemura, H.,Kurihara, M.,Tsuchiya, H.,Shibata, T. 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.1
Electrochemical behaviour of Fe-18Cr-X (X: Al, Si, Ti, Mn, Ni, Cu, Zr, Nb, Mo, and W, 0.5-4 at.%) alloy thin films deposited on Si wafer by ion beam sputtering technique was examined in order to discuss the effect of alloying elements which are completely dissolved in the alloy. Polarisation curves measured in 0.1 krnol m" H2S04 revealed that active dissolution was suppressed by Ni, Nb, Mo, Cu and Ti, but was almost not affected by Al, Si, Mn. Pitting corrosion resistance in acid chloride solutions was extremely improved by Nb, Mo, Ti. On the other hand, Al, Si, Mn exhibited almost no change in pitting potential. Reactivation in sulphuric acid was suppressed by Mo, Nb, Ni, Ti, but not affected or slightly enhanced by Si and Mn. It is noticeable that addition of Nb is especially beneficial for preventing both pitting corrosion and reactivation. The corrosion behaviour of Fe-Cr alloys are discussed in terms of the stability of passive film which is influenced by minute additives incorporated in the film.
MICROSTRUCTURE AND NOISE CHARACTERISTICS IN Co - Cr BASED ALLOY THIN FILM MAGNETIC RECORDING MEDIA
Y. Koshimoto,S. Hirono,T. Ohkubo,S. Umemura,Y. Maeda 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Reducing media noise is a key to realizing high areal recording density. However, perpendicularly oriented Co-Cr films, strong candidates for high density recording media, have received little attention in terms of recording noise. We studied the noise characteristics of Co-Cr based alloy films by varying the compositionally separated structure.<br/> Co-Cr films with fine compositionally separated microstructure were observed to have low noise, which recording density dependence were negative or week. Studies on control of the microstructure and magnetic properties in combination with noise analysis are important to realize high density recording media.