Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
권호 표지
DOI QR코드

DOI QR Code

Study on Passive Layer Characteristics of Chemically Passivated Duplex Stainless Steel

화학적 부동태 처리에 따른 듀플렉스 스테인리스 강의 피막 특성에 관한 연구

  • Jang, Heui-Un (Department of Materials Science and Engineering, Pusan National University) ;
  • Lee, Jung-Hoon (Department of Materials Science and Engineering, Pusan National University) ;
  • Kim, Yong-Hwan (Department of Materials Science and Engineering, Pusan National University) ;
  • Chung, Won-Sub (Department of Materials Science and Engineering, Pusan National University)
  • Received : 2012.11.06
  • Accepted : 2012.11.30
  • Published : 2012.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

The aim of the present study was to investigate the corrosion resistance and characteristics of passive layer between naturally passivated and chemically passivated duplex stainless steel, UNS S31803 (EN 1.4462) using CPT, XPS, and EIS. The treatment of $HNO_3$(II) and $HNO_3$(III) in ASTM A 967 was applied. In case of chemically passivated specimen, CPT of $HNO_3$(II) and $HNO_3$(III) were higher than that of naturally passivated specimen. In addition, from XPS results, the protectiveness index (Cr/(Fe+Cr)) of chemically passivated specimens was also higher than that of naturally passivated specimen. The reason for this result is considered due to post-cleaning treatment in chemical passivation process, that is, immersion in $Na_2Cr_3O_7$ solution. The fact that $HNO_3$(II) passivation treatment showed the highest film resistance and 'n', which is exponent related with constant phase element (CPE) of passivation film, was in good agreement with results of CPS and XPS. The chemical passivation treatment was an effective method to improve corrosion resistance of duplex stainless steel.

Keywords

References

  1. I. A. Armas, Recent Patents on Mechanical Engineering, 2008, 1, (2007) 51-57.
  2. Practical Guidelines for the Fabrication of Duplex Stainless Steels, 2nd edition, International Molybdenum Association (IMAO), Pennsylvania, USA (2009) 4.
  3. C. Donik, A. Kocijan, D. Mandrino, I. Paulin, M. Jenko, B. Pihlar, Appl. Surf. Sci., 255 (2009) 7056. https://doi.org/10.1016/j.apsusc.2009.03.041
  4. M. Vayer, I. Reynaud, R. Erre, J. Mater. Sci., 35 (2000) 2581. https://doi.org/10.1023/A:1004719213960
  5. ASTM (American Society for Testing and Materials) A967-05 : Standard Specification for Che-mical Passivation Treatments for Stainless Steel Parts.
  6. D. Han, Y. Jiang, B. Deng, L. Zhang, J. Gao, H. Tan, J. Li, Corrosion., 67 (2011) 2.
  7. J. H. Heo, Ph. D. Thesis, Pusan Univ., Korea (2010), 20.
  8. W. P. Yang, D. Costa, P. Marcus, J. Electrochem. Soc., 141 (1994) 2669. https://doi.org/10.1149/1.2059166

Cited by

  1. Cavitation-erosion Resistance of Stabilized Stainless Steel with Niobium Addition in Sea Water Environment vol.49, pp.3, 2016, https://doi.org/10.5695/JKISE.2016.49.3.274