Effect of Sigma Phase on Electrochemical Corrosion Characteristics of a Deposited Metal of ER2594

Title & Authors
Effect of Sigma Phase on Electrochemical Corrosion Characteristics of a Deposited Metal of ER2594
Jung, Byong-Ho; Kim, Si-Young; Seo, Gi-Jeong; Park, Joo-Young;

Abstract
A deposited metal specimen of ER2594 which is a super duplex steel welding wire used to investigate the effect of sigma($\small{{\sigma}}$) phase on electrochemical corrosion characteristics was prepared by gas tungsten arc welding. Aging treatment was conducted for the specimen at the temperature range of $\small{700^{\circ}C}$ to $\small{900^{\circ}C}$ for 5 to 300 minutes after annealing at $\small{1050^{\circ}C}$. Corrosion current density has decreased a little with an increase of aging time over 60 minutes at $\small{700^{\circ}C}$ to $\small{900^{\circ}C}$ and the uniform corrosion of deposited metal had more influence on the precipitation of ferrite than the precipitation of sigma phase. Therefore, the precipitation of sigma phase did not have much effect on the uniform corrosion. Pitting potential representing pitting corrosion has shown decreasing tendency as the precipitation of sigma phase increased. The degree of sensitization representing intergranular corrosion has shown increasing tendency as the precipitation of sigma phase increased at $\small{700^{\circ}C}$ to $\small{800^{\circ}C}$, while it has decreased at $\small{900^{\circ}C}$ for 60 to 300 minutes.
Keywords
A deposited metal;ER2594;Sigma($\small{{\sigma}}$) phase;Uniform corrosion;Pitting corrosion;Intergranular corrosion;
Language
Korean
Cited by
References
1.
Kobelco Welding Today, 2010, "Superior Welding Consumable for Super Duplex Stainless Steel", Vol. 13, No. 2. p. 1.

2.
S. S. M. Tavares et al., 2007, "Characterization of microstructure, chemical composition, corrosion resistance and toughness of a multipass weld joint of super duplex stainless steel UN S32750", Materials Characterization, Vol. 58, pp. 610-616.

3.
Bo Deng et al, 2009, "Evaluation of localized corrosion in duplex stainless steel aged at $850^{\circ}C$with critical pitting temperature measurement", Electrochemica Acta, Vol. 54, pp. 2790-2794.

4.
Z. Cvijovic et al, 2006, "Microstructure and pitting corrosion resistance of annealed duplex stainless steel", Corrosion Science., Vol. 48, pp. 3887-3906.

5.
Damian J and Kotecki, 2009, "Some pitfalls in welding duplex stainless steels", Stainless Steel World, December, pp. 51-57.

6.
K. Ravindranath and S. N. Malhotra, 1995, "The Influence of Aging on the Intergranular Corrosion of 22Cr-5Ni Duplex Stainless Steel", Corrosion Science, Vol. 37, No. 1, pp. 121-132.

7.
SC. Duret-Thual, M. Bonis et al., 1999, "Application of the EPR method to duplex stainless steels", Materials and Corrosion, Vol. 52, pp. 37-44.

8.
B. Gideon, L. ward and G. Biddle, 2008, "Duplex Stainless Steel Welds and their Susceptibility to Intergranular Corrosion", Journal of Materials & Materials Characterization & Engineering, Vol. 7, No. 3, pp. 247-263.

9.
N. Lopez, M. Cid, M and Puiggali, 1999, "Influence of ${\sigma}$-phase on mechanical properties and corrosion resistance of duplex stainless steel", Corrosion Science, Vol. 41, pp. 1615-1631.

10.
C.J. Park et al., 2005, "Effects of Sigma Phase on the Initiation and Propagation of Pitting Corrosion of Duplex Stainless Steel", Corrosion, Vol. 61, No. 1, pp. 76-83.

11.
J. M. Pardal et al., 2009, "Influence of the grain size on deleterious phase precipitation in superduplex stainless steel UNS S32750", Materials Characterization, Vol. 60, No. 3, pp. 165-172.

12.
IMA, 2009, "Practical Guidelines for the Fabrication of Duplex Stainless Steels" 2nd edition, IMOA 1999-2009.

13.
J. H. Potgieter, P. A. Olubambi et al., 2008, "Influence of nickel additions on the corrosion behaviour of low nitrogen 22% Cr series duplex stainless steels", Corrosion Science, Vol. 50, pp. 2572-2579.

14.
Franc Tehovnik, Boris Arzensek et al., 2011, "Microstructure Evolution in SAF 2507 Super Duplex Stainless Steel", Materials and Technology, Vol. 45, No. 4, pp. 339-345.

15.
J. H. Lee, G. J. Seo, B. H. Jung and C. Y. Kang, 2014, "Effect of Aging Treatment on Pitting Corrosion of Super Duplex Stainless Steel Weld Metal", Journal of the korean Society of Power System Engineering, Vol. 18, No. 2, pp. 70-76.

16.
N. Ebrahimi et al., 2011, "Correlation between critical pitting temperature and degree of sensitization on alloy 2205 duplex stainless steel", Corrosion Science, Vol. 53, pp. 637-644.