Influence of near-surface microstructures on the transient current response in Fe-Cr-Ni alloys during scratch tests
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REFERENCES 1. F. Sommer, G. Bucher, and B. Predel: Liquid and Amorphous Metals, Edns des Physique, 1980, p. 563. 2. A.P. Tsai, A. Inoue, and T. Masumoto: J. Mater. Sci. Lett., 1988, vol. 7, p. 805. 3. A. lnoue, K. Ohtera, K. Kohinata, A.P. Tsai, and T. Masumoto: J. Non-Cryst. Solids, 1990, vol. 117-118, p. 712. 4. S.G. Kim, A. Inoue, and T. Masumoto: Mater. Trans. JIM, 1990, vol. 31, p. 929. 5. Y.H. Kim, A. Inoue, and T. Masumoto: Mater. Trans. JIM, 1990, vol. 31, p. 747. 6. S.G. Kim, A. Inoue, and T. Masumoto: Mater. Trans. JIM, 1991, vol. 32, p. 1875. 7. M.F. Ashby: Acta Metall. Mater., 1993, vol. 41, p. 1313. 8. H. Kimura, T. Masumoto, and M. Hasegawa: J. Mater. Sci. Lett., 1984, vol. 3, p. 1003. 9. P.G. Zielinski and D.G. Ast: J. Mater. Sci. Lett., 1983, voi. 2, p. 495. 10. Becker and Ebert, Z. Phys., 1923, vol. 65, p. 161. 11. Cohesion in Metal-Transition Metal Alloys, F.R. de Boer, R. Boom, W.C. Mattens, A.R. Miedema, and A.K. Nissen, eds., North-Holland, Amsterdam, 1988, p. 320. 12. Selected Values of Thermodynamic Properties of Binary Alloys, R. Hultgern, P.D. Desai, D.T. Hawkins, M. Gleiser, and K.K. Kelley, ASM, Metals Park, OH, 1973, p. II 420.
Influence of Near-Surface Microstructures on the Transient Current Response in Fe-Cr-Ni Alloys during Scratch Tests S.K. VARMA, MONICA M. de LUGO, A.H. ADVANI, and A. BRONSON Metals and alloys are protected from the corrosive environments in which they are used by the presence of a passive film on the surface. However, the passivity of a metal surface cannot be preserved if mechanical forces rupture this protective film from the surface. Thus, during corrosive wear, the process of wear essentially destroys the passive film, which then leaves a bare metal surface for the corrosion reaction to start taking place once again. In an industrial application of a metal, the S.K. VARMA and A. BRONSON, Professors, MONICA M. de LUGO, Graduate Student, and A.H. ADVANI, Member of Adjunct Faculty, are with the Metallurgical and Materials Engineering Department, The University of Texas at E1 Paso, E1 Paso, TX 799680520. Manuscript submitted March 29, 1993. METALLURGICAL AND MATERIALS TRANSACTIONS A
process of passivation, depassivation, and repassivation kinetics must be completely understood if the life of a metal part is to be prolonged. The purpose of this article is to study the kinetics involved in the corrosive wear of Fe-Cr-Ni alloys by the scratch technique and to determine the relationship between the electrochemical response of these alloys and the near-surface microstructures. The scratch techniquet~-161 consists of dropping a stylus containing a diamond tip onto a rotating electrode in an electrolyte of known strength. The transient current response from the alloy surface is then used for understanding the kinetics of the processes like depassivation and repassivation. This technique has been successfully used for studying the repassivation kinetics, ~ rate of metal dissolution) lsl rate of film growth, 114'16'191 and formation of adsorbed layer, t2~ It is importan
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