Abstract
Effects of sulphate (SO 2−4 ), thiosulphate (S2O 2−3 ) and hydrogensulphate (HSO −4 ) ion additives on the pitting corrosion of pure aluminium in 1 M NaCl solution have been investigated at various solution temperatures Ts, 40–70 °C using potentiodynamic polarisation experiment, double current step experiment and scanning electron microscopy (SEM). From the analysis of the galvanostatic potential transients obtained from the double current step experiment, it was suggested that both SO 2−4 and S2O 2−3 ions retard the initiation of the etch pits, and that they also inhibit the passivation of the etch pits during the current interruption to promote the subsequent re-activation of the etch pits over the whole range of Ts. In contrast, it was found that HSO −4 ions promote the initiation of the etch pits and at the same time, they enhance the passivation of the etch pits during the current interruption with rising Ts. From the SEM micrographs, it was revealed that as Ts increased the pit morphology changed from circular shape to irregular shape with rough surface in the presence of SO 2−4 or S2O 2−3 ions, but it changed to strip-like shape in the presence of HSO −4 ions. The beneficial effects of anion additives on the increase in surface area were discussed on the basis of the morphological change of the etch pits in the presence of anion additives.
Similar content being viewed by others
References
Lin W, Tu GC, Lin CF, Peng YM (1997) Corros Sci 39:1531
Goad DGW, Uchi H (2000) J Appl Electrochem 30:285
Wiersma BJ, Hebert KR (1991) J Electrochem Soc 138:48
Tak Y, Sinha N, Hebert KR (2000) J Electrochem Soc 147:4103
Sinha N, Hebert KR (2000) J Electrochem Soc 147:4111
Dunn CG, Bolon RB, Alwan AS, Stirling AW (1971) J Electrochem Soc 118:381
Beck TR, Uchi H, Hebert KR (1989) J Appl Electrochem 19:69
Lee WJ, Pyun SI (2000) Electrochim Acta 45:1901
Pyun SI, Na KH, Lee WJ, Park JJ (2000) Corrosion 56:1015
Wernick S, Pinner R, Sheasby PG (1987) The surface treatment and finishing of aluminium and its alloys. ASM International, Metals Park. p190
Na KH, Pyun SI (2004) J Solid State Electrochem 8:935, DOI: 10.1007/s10008-004-0511-3
Flis J, Kowalczyk L (1995) J Appl Electrochem 25:501
Osawa N, Fukuoka K (2000) Corros Sci 42:585
Pyun SI, Moon SM (1999) J Solid State Electrochem 3:331
Dean JA (1999) Lange’s handbook of chemistry. Mcgraw-Hill, New York. p8.20
Schwabe K, Voigt C (1969) Electrochim Acta 14:853
Macdonald JR (1972) Impedance spectroscopy. Wiley, New York. p180
Bae JS, Pyun SI (1994) J Mater Sci Lett 13:573
Acknowledgements
The receipt of a research grant (grant No. R01-2000-000-00240-0) from Korea Science and Engineering Foundation is gratefully acknowledged. Incidentally, this work was partly supported by the Brain Korea 21 project. The authors are indebted to Dr. J.-W. Lee in the corrosion and interfacial electrochemistry research laboratory at KAIST for his helpful discussion.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Na, KH., Pyun, SI. Effects of SO 2−4 , S2O 2−3 and HSO −4 ion additives on the pitting corrosion of pure aluminium in 1 M NaCl solution at 40–70 °C. J Solid State Electrochem 9, 639–645 (2005). https://doi.org/10.1007/s10008-004-0629-3
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10008-004-0629-3