1. 1) R. P. Frankenthal and D. E. Thompson: Proceedings of the 4th International Symposium on Passivity, R. P. Frankenthal and J. Kruger, ed., The Electrochemical Society Inc., New Jersey (1978), p. 262.
2. 2) T. Shibata and T. Takeyama: Report of Technical Subcommittee of Surface Treatments of Stainless Steels, The Japan Society of Corrosion Engineering, (1980), p. 73.
3. 3) M. Seo, Y. Matsumura and N. Sato: Trans. JIM, 20 (1979), 501.
4. 4) K. Asami and K. Hashimoto: Corrosion Sci., 19 (1979), 1007.