Author(s) Oluwatoyin Adenike Olaseinde, Joasias Van der Merwe, Lesley Cornish

Affiliation(s)
Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure, Nigeria.
School of Chemical and Metallurgical Engineering, University of Witwatersrand, Johannesburg, South Africa.

ABSTRACT

The 2101, 2205 and 2507 are duplex stainless steels. They have two phases: austenite and ferrite. The metallurgical characterization was performed by means of Scanning Electron Microscopy (SEM) with EDX and X-ray diffractometry (XRD). The corrosion behaviour was evaluated by potentiodynamic tests. The corrosion tests were conducted with the aid of potentiostat. The SEM and XRD revealed phases of austenite and ferrite without any intermetallic phase. The elemental analysis of the phases showed that the elements partitioned more into the phases that they promoted. The corrosion resistance of 2507 was higher than 2205 and 2101 as it may be seen on the polarization curves. Comparing the two media, the following relation to their corrosion resistance: 2507 > 2205 > 2101 was established.

KEYWORDS
Duplex Stainless Steels; Potentiodynamic Tests; Characterization

Cite this paper
Olaseinde, O. , Merwe, J. and Cornish, L. (2014) Characterization and Corrosion Behaviour of Selected Duplex Stainless Steels in Acidic and Acidic-Chloride Solution. Advances in Chemical Engineering and Science, 4, 89-93. doi: 10.4236/aces.2014.41012.

References
[1]   H. D. Solomon and T. M. Devine, “Duplex Stainless Steels,” Proceedings of Conference on Duplex Stainless Steels, Metal Park, 1983, pp. 693-756.

[2]   F. M. Khoshnaw and R. H. Gardi, “Pitting Corrosion Resistance Determination of Duplex Stainless Steel by Using Critical Pitting Temperature Method,” 2006.
http://www.stainless-steelworld.net/duplex/pittingcorrosion.asp

[3]   J. Chance, W. Coop and K. J. Gradwell, “Structure Property Relationships in a 25Cr-7Ni-2Mo Duplex Stainless Steel Casting Alloy,” R. A. Lula, Ed., Proceedings of the Duplex Stainless Steel Conference, ASM Metals, Metal Park, 1983, p. 371.

[4]   A. Desestret and J. Charles, “Stainless Steels,” P. Lacombe, B. Baroux and G. Beranger, Eds., Les Editions de Physique, Paris, 1993, p. 2006.

[5]   International Molybdenum Association, “Practical Guidelines for the Fabrication of Duplex Stainless Steels,” 2nd Edition, 2009. www.imoa.info

[6]   J. M. Lardon, J. Charles, F. Dupoiron and J. C. Bavay, “Duplex Austenitic—Ferritic Stainless Steel, Mechanical Properties and Corrosion Resistance,” Proceedings of the Conference on High Nitrogen Steels, Lille, 18-20 May 1988, p. 280.

[7]   ASTM, “ASTM Designation: A923-06,” Standard Test Methods for Detecting Detrimental Intermetallic Phases in Duplex Austenitic/Ferritic Stainless Steel.

[8]   J. K. L. Lai, K. W. Wong and D. J. Li, “The Effect of Solution Treatment on The Transformation Behaviour of Cold Rolled Duplex Stainless Steels,” Material Science and Engineering A, Vol. 203, No. 1-2, 1995 pp. 356-364.
http://dx.doi.org/10.1016/0921-5093(95)09863-1

[9]   S. A. Távara, M. D. Chapetti, J. L. Otegui and C. Manfredi, “Influence of Nickel on the Susceptibility to Corrosion Fatigue of Duplex Stainless Steel Welds,” International Journal of Fatigue, Vol. 23, No. 7, 2001, pp. 619-626. http://dx.doi.org/10.1016/S0142-1123(01)00018-4