Abstract
The electrochemical polarization behaviour of a titanium alloy (IMI 834) was studied in different concentrations of aqueous and ethylene glycolic solutions of hydrochloric and phosphoric acid at 30 °C. The influence of furnace cooled (FC), air cooled (AC) and water quenched (WQ) heat treatments and microstructure on polarization behaviour was also studied. An active passive transition and a large range of passivity potential were observed in aqueous and glycolic solutions of the acids. The magnitudes of the critical current density (i c) and passive current density (i p) were higher for hydrochloric acid in comparison to phosphoric acid. Values of i c and i p were lower in ethylene glycol–hydrochloric acid up to 7 M and were higher above 7 M hydrochloric acid–ethylene glycol solutions as compared to the corresponding hydrochloric acid concentrations. However, these values were always lower in ethylene glycol–phosphoric acid than in phosphoric acid solutions. The microstructure of the alloy after solution treatment (1080 °C, 30 min; FC, AC and WQ) showed single phase transformed β structure. The increase in the cooling rate enhances the fineness of the β laths. The working electrode surface was examined by scanning electron microscopy (SEM) and scanning tunnelling microscopy (STM).
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References
E. Eylon, S. Fujishiro, P.J. Postans and F.H. Froes, J. Met. 1 (1984) 55–62.
A.A. Mazhar, F. El-Taib Heakel and A.G. Gad-Allah, Corrosion 44 (1988) 705.
S.M.A. Hosseini and V.B. Singh, Mater. Chem. Phys. 33 (1993) 63.
V.B. Singh and S.M.A. Hosseini, Corros. Sci. 34 (1993) 1723.
V.B. Singh and S.M.A. Hosseini, Indian J. Chem. Technol. 1 (1994) 287.
S.X. Yu, C.W. Brodrick, M.P. Ryan and J.R. Scully, J. Electrochem. Soc. 146 (1999) 4429.
R. Schutz, in D. Eylon, R. Boyer and D. Koss (Eds), ‘Beta Titanium Alloys in the 1990s', (Minerals, Metals and Materials Society, Warrendale PA, 1993), p. 75.
P. Marcus, Corros. Sci. 36 (1994) 2155.
T. Hurlen, H. Bentzen and S. Hornkjol, Electrochim. Acta 32 (1987) 1613.
J.A. Bardwell and M.C. McKurbre, Electrochim. Acta 36 (1991) 647.
C.V.D. Alkaine, L.M.M. De Souza and F.C. Nart, Corros. Sci. 34 (1993) 109.
V.B. Singh and S.M.A. Hosseini, J. Appl. Electrochem. 24 (1994) 250.
N.T. Thomas and K. Nobe, Corrosion 29 (1973) 188.
E.J. Kelly and H.R. Bronstein, J. Electrochem. Soc. 131 (1984) 2232.
A. Caprani and J.P. Prayre, Electrochim. Acta 24 (1979) 835.
C.K. Dyer and J.S.L. Leach, Electrochim. Acta 23 (1978) 1387.
D.J. Blackwood and L.M. Peter, Electrochim. Acta 33 (1988) 1143.
P.Y. Park, E. Akiyama, H. Habazaki, A. Kawashima, K. Asami and K. Hoshimoto, Corros. Sci. 38 (1996) 1649.
X. Li, E. Akiyama, H. 1-labazaki, A. Kawashima, K. Asami and K. Hoshimoto, Corros. Sci. 39 (1997) 935.
R. Otsuka, Sci. Papers IPRC 54 (1960) 97.
R.C. May, F.H. Beck and M.G. Fontana, ‘Stress Corrosion Cracking of Titanium Alloys’, The Ohio State University, NGL 36-008-051 Sept. (1971).
T. Philips, P. Poople and L.L. Shreir, Corros. Sci. 12 (1972) 855.
A. Caprani, PhD thesis, University of Paris, CNRS A.0. 10 (1974) 1441.
S.H. Weiman, Corrosion 22 (1966) 98.
N.T. Thomas and K. Nobe, J. Electrochem. Soc. 119 (1972) 1450.
R.D. Armstrong and R.E. Firman, J. Electroanal. Chem. 34 (1979) 391.
J.A. Harison and D.E. Williams, Electrochim. Acta 27 (1982) 891.
L. Garfias-Mesias, M.J. Alodan, P.L. James and W.H. Smyrl, J. Electrochem. Soc. 145 (1998) 2005.
O. Bastiansen and C. Finback, ‘Phosphorus and its Compounds’, Vol. 1 (Interscience, New York, 1958) p. 489.
A.A. Mazhar, M.M. Hefny, F. El-Taib Heakel and M.S. El-Basiouny, Brit. Corros. J. 8 (1983) 156.
M. Levy, Corrosion 23 (1967) 236.
H.H. Uhlig, Corrosion 19 (1963) 213t.
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Singh, V., Gupta, A. Microstructural and corrosion studies of Ti alloy (IMI 834) in acidic solutions. Journal of Applied Electrochemistry 32, 795–803 (2002). https://doi.org/10.1023/A:1020170129275
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DOI: https://doi.org/10.1023/A:1020170129275