Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
권호 표지
DOI QR코드

DOI QR Code

Elucidation of Intergranular Corrosion of UNS N08810 alloys

UNS N08810 합금의 입계부식손상과 원인 분석

  • Kim, Youngsik (Materials Research Center for Energy and Green Technology, School of Advanced Materials Engineering, Andong National University) ;
  • Hwangbo, Deok (Materials Research Center for Energy and Green Technology, School of Advanced Materials Engineering, Andong National University)
  • 김영식 (국립안동대학교 신소재공학부 청정에너지소재기술연구센터) ;
  • 황보덕 (국립안동대학교 신소재공학부 청정에너지소재기술연구센터)
  • Received : 2012.09.05
  • Accepted : 2012.10.24
  • Published : 2012.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

Corrosion failure of petrochemical facilities is one of the difficulties in maintenance, since operating conditions of crude oil production, storage, and refinement are very aggressive. UNS N08810, which has been used for crude oil transportation pipes and storage tanks in petrochemical industries, shows good resistance to general corrosion and localized corrosion in several environments. Among its environments, UNS N08810 showed better corrosion resistance in fuel gas containing sulfuric acid and phosphoric acid and sulfur. However, ductility and toughness at high temperature over about $500^{\circ}C$ were greatly reduced due to microstructural change. In general, welding process is the representative method to join the parts in industrial components. Because the alloy by welding can be sensitized and corroded, the manufacturing process should be controlled. In this work, UNS N08810 was used and heat treatment conditions including solution and stabilization treatments were controlled. Oxalic acid etch test by ASTM A262 Practice A was done to evaluate the qualitative sensitization in room temperature. Huey test by ASTM A262 Practice C was done to evaluate the intergranular corrosion rate in boiling 65% $HNO_3$ solution. Also, the microstructure by thermal history was analyzed. Experimental alloy showed high intergranular corrosion rate and its corrosion mechanism was elucidated.

Keywords

References

  1. M. Fulger, D. Ohai, M. Mihalache, and M. Pantiru, J. Nucl. Mater., 385, 288 (2009). https://doi.org/10.1016/j.jnucmat.2008.12.004
  2. H. Sahlaoui, K. Makhlouf, H. Sidhom, and J. Philibert, Mater. Sci. Eng., A372, 98 (2004).
  3. J. H. Payer and R. W. Staehle, Corros. Sci., 31, 30 (1975). https://doi.org/10.5006/0010-9312-31.1.30
  4. M. I. Kim, Metallography, p. 63, Bomundang (1993).
  5. J. Campbell, Castings, p. 142, Butterworth-Heinemann (1993).
  6. ASTM A 262, Standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels (2002).
  7. Private communication to manufacturer (2012).
  8. H. Tan, Y. Jiang, B. Deng, W. Gao, and J. Li, Nucl. Eng. Des., 241, 1421 (2011). https://doi.org/10.1016/j.nucengdes.2011.02.019
  9. M. Fulger, M. Mihalache, D. Ohai, S. Fulger, and S. C. Valeca, J. Nucl. Mater., 415, 147 (2011). https://doi.org/10.1016/j.jnucmat.2011.05.007
  10. F. A. Khalid, N. Hussain, and K. A. Shahid, Mater. Sci. Eng., A265, 87 (1999).
  11. R. Dehmolaei, M. Shamanian, and A. Kermanpur, Mater. Chara., 59, 1447 (2008). https://doi.org/10.1016/j.matchar.2008.01.013
  12. Welding Institute of Canada, Welding metallurgy of stainless steels, p. 10, Abington publishing (1994).