Abstract
The influence of chloride ion concentration and pH (2.0, 6.0 and 11.0) on the corrosion behaviour of 8090 (Al-Li-Cu-Mg-Zr) and 2014 (Al-4.4%Cu) alloys has been studied in NaCl solution using a potentiodynamic polarization technique. The corrosion rate for both the alloys was high at pH values of 2.0 and 11.0 as compared to that at pH 6.0, and the rate increased in chloride ion concentration at all pH levels. A similar result was found for the passive current density. Increase in pH changed the slope of the cathodic polarization curve by changing the cathodic reaction. Increasing the chloride ion concentration decreased the cathodic reaction rate. On the other hand, the anodic reaction rate increased with increase in chloride ion concentration. The open circuit corrosion potential and the pitting potential shifted in the active (negative) direction with increasing pH and chloride ion concentration. The i p values for 8090-T851 were slightly lower than those for 2014-T6.
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References
E. Deltombe and M. Pourbaix, Corrosion (1958) 496t–500t.
C. Edeleanu and U. R. Evans, Trans. Faraday. Soc. 47 (1951) 1121–1135.
M. Pourbaix, ‘Atlas of Electrochemical Equilibrium Diagrams in Aqueous Solutions’, NACE, Houston, Texas (1966) p. 499.
A. B. McKee and R. H. Brown, Corrosion 3 (12) (1947) 595.
W. Beck, F. G. Keihn and R. G. Gold, J. Electrochem. Soc. 101 (1954) 393.
Z. Szklarska-Smialowska, ‘Pitting Corrosion of Metals’, NACE, Houston (1986).
J. R. Galvele, in ‘Passivity of Metals’, (edited by R. Frankenthal and J. Kruger), The Electrochemical Society, Princeton, NJ (1978) p. 285.
J.M. Kolotyrkin, Transactions of the Symposium on Electrode Processes, (edited by Earnest Yeager), pp. 191–196.
J. Heyrovsky, Discussions Faraday Soc. 1 (1947) 212.
J. Randles and K. Somerton, Trans. Faraday Soc. 48 (1952) 937, 951.
H. Gerischer, Z. Physik. Chem. (1953) 202, 292, 302.
R. Pointelli, Chem. and Ind. (London) N40 (1957) 1304.
R. T. Foley, Corrosion 42 (1986) 277–288.
K. Videm, Kjeller Report KR-149, Institute for Atommenergi (1974).
L. I. Antropov, in ‘Theoretical Electrochemistry’, Mir Publishers, Moscow (1972) pp. 503–510.
G. A. Dibari and H. J. Read, Corrosion 21(11) (1971) 483.
A. Frumkin, Transactions of the Symposium on Electrode Processes, (edited by Earnest Yeager), pp. 1–15.
M. Yasuda, F. Weinberg and D Tromans, J. Electrochem. Soc. 137, (12) (1990) 3708–3715.
J. Kruger, in ‘Passivity and its Breakdown on Iron and Iron Base Alloys’, USA-Japan Seminar, NACE, Houston, TX (1976) p. 91.
R. Roth and H. Kaseche, in Proceedings of the 5th International Aluminium-Lithium Conference, Vol. III (edited by T. H. Sanders, Jr., and E. A. Starke, Jr.), Williamsburg, VA, 27–31 March (1989) p. 1207.
R. E. Rinker and D. J. Duquette, ‘Aluminium-Lithium Alloys II’, TMS-AIME, Warrendale, PA (1984) p. 581.
B. N. Stirrup, N. A. Hampson and I. S. Misglcy, J. Appl. Electrochem. 5 (1975) 229.
H. Bohni and H. H. Uhlig, J. Electrochem. Soc. 116, (7) (1969) 906.
A. J. Sedricks, J. A. J. Green and D. L. Novak, Corrosion 27 (1971) 199.
M. Reboul and P. Meyer, in Proceedings of the 4th International Aluminium-Lithium Conference, Vol. 11, (edited by G. Champier, B. Dubost, D. Mianny and L. Sabetay), France, 10–12 June (1987) p. C-3-881.
J. Gui and T. M. Devine, Scri. Met. 21 (1987) 853.
S. Furuya and N. Soga, Corrosion 46 (1990) 989–993.
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Ambat, R., Dwarakadasa, E.S. Studies on the influence of chloride ion and pH on the electrochemical behaviour of aluminium alloys 8090 and 2014. JOURNAL OF APPLIED ELECTROCHEMISTRY 24, 911–916 (1994). https://doi.org/10.1007/BF00348781
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DOI: https://doi.org/10.1007/BF00348781