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Effect of metallurgical factors on the pitting corrosion behavior of super austenitic stainless steel weld in an acidic chloride environment

Published online by Cambridge University Press:  27 February 2017

Sung Jin Kim ,
Seung Gab Hong  and
Min-suk Oh
Sung Jin Kim*
Affiliation:
Department of Advanced Materials Engineering, Sunchon National University, Jungang-ro, Suncheon 540-742, Republic of Korea
Seung Gab Hong
Affiliation:
POSCO Steel Solution Marketing Division, Geidong-Dong, Pohang 790-704, Republic of Korea
Min-suk Oh*
Affiliation:
Automotive Components & Materials R&D Group, Korea Institute of Industrial Technology, Gwanju 500-480, Republic of Korea
*
a)Address all correspondence to these authors. e-mail: sjkim56@sunchon.ac.kr
b)e-mail: misoh@kitech.re.kr
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Abstract

This study examined the effects of a variety of metallurgical factors on the electrochemical corrosion behavior of superaustenitic stainless steel welds. First, the effects of the sigma (σ)-phase on the corrosion behavior were studied by means of a three-dimensional-atom probe. Cr and Mo depletion areas formed around the σ-phases which are precipitated in the interdendritic area were clearly observed. Second, the effects of oxide inclusion on the pitting corrosion of the steel welds were analyzed. The utilization of high resolution transmission electron microscope clearly demonstrated that the thickness and Cr content of the passive film formed on the steel surface decreased significantly with decreasing distance to the oxide inclusion, resulting in a deterioration of the corrosion resistance. Third, the effects of alloying elements, Cu and Al, were evaluated using an electrochemical polarization technique. This confirmed that Cu has a detrimental effect on the resistance to localized corrosion of the steel. The addition of Al up to 0.25 wt% had no significant effects on corrosion resistance in a chloride environment despite the presence of an Al-based oxide layer (Al2O3) on the outermost surface.

Keywords

steelcorrosionpassivation
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 7 , 14 April 2017 , pp. 1343 - 1350
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

REFERENCES

Kim, S.T., Kim, S.Y., Lee, I.S., Park, Y.S., Shin, M.C., and Kim, Y.S.: Effects of shielding gases on the microstructure and localized corrosion of tube-to-tube sheet welds of super austenitic stainless steel for seawater cooled condenser. Corros. Sci. 53, 2611 (2011).Google Scholar
Mori, G. and Bauernfeind, D.: Pitting and crevice corrosion of superaustenitic stainless steels. Mater. Corros. 55, 164 (2004).Google Scholar
Gooch, T.G.: Corrosion behavior of welded stainless steel. Weld. J. 75, 135s (1996).Google Scholar
ASM International: Corrosion of Weldments (ASM International, Materials Park, 2006).Google Scholar
Banovic, S.W., Dupoint, J.N., and Marder, A.R.: Dilution and microsegregation in dissimilar metal welds between super austenitic stainless steel and nickel base alloys. Sci. Technol. Weld. Joining 7, 374 (2002).Google Scholar
Nam, S.K., Park, S.J., Na, H.S., and Kang, C.Y.: Effect of welding thermal cycle on microstructure and pitting corrosion property of multi-pass weldment of super duplex stainless steel. J. Weld. Joining 28, 18 (2010).Google Scholar
Paulraj, P. and Garg, R.: Effect of intermetallic phases on corrosion behavior and mechanical properties of duplex stainless steel and super-duplex stainless steel. Adv. Sci. Technol. Res. J. 9, 87 (2015).Google Scholar
Jang, S.H., Kim, S.T., Lee, I.S., and Park, Y.S.: Effect of shielding gas composition on phase transformation and mechanism of pitting corrosion of hyper duplex stainless steel welds. Mater. Trans. 52, 1228 (2011).Google Scholar
Marcus, P. and Olefjord, I.: A round robin on combined electrochemical and AES/ESCA characterization of the passive films on Fe Cr and Fe Cr Mo alloys. Corros. Sci. 28, 589 (1998).Google Scholar
Qvarfort, R.: Some observations regarding the influence of molybdenum on the pitting corrosion resistance of stainless steels. Corros. Sci. 40, 215 (1998).Google Scholar
Nilsson, J.O. and Wilson, A.: Influence of isothermal phase transformations on toughness and pitting corrosion of super duplex stainless steel SAF 2507. Mater. Sci. Technol. 9, 545 (1993).Google Scholar
Wilms, M.E., Gadgil, V.J., Krougman, J.M., and Ijsseling, F.P.: The effect of σ-phase precipitation at 800 °C on the corrosion resistance in sea-water of a high alloyed duplex stainless steel. Corros. Sci. 36, 871 (1994).Google Scholar
Ravindranath, K. and Malhotra, S.N.: The influence of aging on the intergranular corrosion of 22 chromium-5 nickel duplex stainless steel. Corros. Sci. 37, 121 (1995).Google Scholar
Ravindranath, K. and Malhotra, S.N.: Influence of aging on intergranular corrosion of a 25% chromium-5% nickel duplex stainless steel. Corrosion 50, 318 (1994).Google Scholar
Frankel, G.S.: Pitting corrosion of metals. J. Electrochem. Soc. 145, 2186 (1998).Google Scholar
Ha, H.Y., Park, C.J., and Kwon, H.S.: Effect of non-metallic inclusions on the initiation of pitting corrosion in 11% Cr ferritic stainless steel examined by micro-droplet cell. Corros. Sci. 49, 1266 (2007).Google Scholar
Eklund, G.: Initiation of pitting at sulfide inclusions in stainless steel. J. Electrochem. Soc. 121, 467 (1974).Google Scholar
Wranglen, G.: Pitting and sulphide inclusions in steel. Corros. Sci. 14, 331 (1974).Google Scholar
Webb, E.G., Suter, T., and Alkire, R.C.: Microelectrochemical measurements of the dissolution of single MnS inclusions, and the prediction of the critical conditions for pit initiation on stainless steel. J. Electrochem. Soc. 148(5), B186 (2001).Google Scholar
Williams, D.E. and Zhu, Y.Y.: Explanation for initiation of pitting corrosion of stainless steels at sulfide inclusions. J. Electrochem. Soc. 147(5), 1763 (2000).CrossRefGoogle Scholar
Szklarska-Smialowska, Z.: Influence of sulfide inclusions on the pitting corrosion of Steels. Corrosion 28, 388 (1972).Google Scholar
Yamamoto, A., Ashiura, T., and Kamisaka, E.: Mechanism of improvement on corrosion resistance by copper addition to ferritic stainless steels. Boshoku Gijutsu 35, 448 (1986).Google Scholar
Kim, S.T. and Park, Y.S.: Effect of copper addition on corrosion behavior of high performance austenitic stainless steel in highly concentrated sulfuric acid solution. Corrosion 63, 114 (2007).Google Scholar
Jeon, S.H., Kim, S.T., Lee, I.S., Park, J.H., Kim, K.T., Kim, J.S., and Park, Y.S.: Effects of copper addition on the formation of inclusions and the resistance to pitting corrosion of high performance duplex stainless steels. Corros. Sci. 53, 1408 (2011).Google Scholar
Pardo, A., Merino, M.C., Carboneras, M., Coy, A.E., and Arrabal, R.: Pitting corrosion behavior of austenitic stainless steels with Cu and Sn additions. Corros. Sci. 49, 510 (2007).Google Scholar
Gurram, M., Adepu, K., Pinninti, R.R., and Gankidi, M.R.: Effect of copper and aluminium addition on mechanical properties and corrosion behavior of AISI 430 ferritic stainless steel gas tungsten arc welds. J. Mater. Res. Technol. 2, 238 (2013).Google Scholar
Zhang, X., Fan, L., Xu, Y., Li, J., Xiao, X., and Jiang, L.: Effect of aluminum on microstructure, mechanical properties and pitting corrosion resistance of ultra-pure 429 ferritic stainless steels. Mater. Des. 65, 682 (2015).Google Scholar
Kim, S.J. and Hong, S.G.: A study on pitting initiation mechanism of super-austenitic stainless steel weld in chloride environment. J. Mater. Res. 31, 3345 (2016).Google Scholar
ASTM G48: Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution (ASTM International, West Conshohocken, 2011).Google Scholar
Kim, S.J. and Hong, S.G.: Evaluation of localized corrosion resistance and clarification of the corrosion mechanism of super austenitic stainless steel weld. POSCO Technol. Rep. 20(1), 1–8 (2015).Google Scholar
Porter, D.A. and Easterling, K.E.: Phase Transformations in Metals and Alloys (Chapman & Hall, London, UK, 1997).Google Scholar
Kaprálik, I.: Thermal expansion of spinels MgCr2O4, MgAl2O4 and MgFe2O4 . Chem. Zvesti 23, 665 (1969).Google Scholar
Khatak, H.S. and Raj, B.: Corrosion of Austenitic Stainless Steels, Mechanism, Mitigation and Monitoring (Alpha Science International, Oxford, UK, 2002).Google Scholar
Smuk, O., Nenonen, P., Hänninen, H., and Liimatainen, J.: Microstructures of a powder metallurgy-hot-isostatically pressed super duplex stainless steel forming in industrial heat treatments. Metall. Mater. Trans. A 35A, 2103 (2004).Google Scholar
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