Electrochemical corrosion behaviours of Fe68Ni14-xMoxSi2B16 metallic glasses in 1N HCl and 1N H2SO4
- 79 Downloads
Electrochemical corrosion behaviours of five Fe68Ni14-xMoxSi2B16 glasses with x=0, 1, 2, 3 and 4 have been investigated in both 1 N HCl and 1 N H2SO4 solutions using potentiodynamic polarization and a.c. impedance spectroscopic techniques. The polarization and impedance results show that all the alloys possess inferior corrosion resistance which has been attributed to the low Ni content on one hand and the absence of passivators such as Cr and P on the other. Interestingly the alloys have been found to show weak passivation in more aggressive HCl and not in relatively mild H2SO4 solution. This has been explained in terms of dual behaviours of Mo in HCl and H2SO4 based on impedance data and literature work. The present study attempts to correlate impedance data with polarization data through the parameter polarization resistance and indicates that both values are comparable only when an alloy undergoes active dissolution and not when it exhibits passivity.
KeywordsCorrosion Resistance Metallic Glass Potentiodynamic Polarization Glassy Alloy Saturated Calomel Reference Electrode
Unable to display preview. Download preview PDF.
- 1.T. EGAMI, P. J. FLANDENS and C. D. GRAHAM Jr, in American Institute of Physics (AIP) Conference Proceedings No. 24, edited by C. D. Graham Jr, G. M. Lander and J. J. Rhyne (New York, 1975) p. 697.Google Scholar
- 2.R. HASEGAWA and C. P. CHEN, US patent no. 4152144 (1979).Google Scholar
- 3.R. HASEGAWA, G. E. FISH and V. R. V. RAMANAN, in Proceedings of the 4th International Conference on Rapidly Quenched Metals edited by T. Masumoto and K. Suzuki (Japan Institute of Metals, Aoba Aramaki, Sendai, Japan, 1981) Vol. 2, p. 929.Google Scholar
- 10.M. SEO and N. SATO, Corrosion paper No. 138, NACE, New Orleans, LA, 1989.Google Scholar
- 13.I. EPELBOIN, M. KEDDAM and J. C. LESTRADE, Trans. Farad. Soc. 56 (1981) 264.Google Scholar