A Diffusivities of Point Defects Study of Passive State on 316L and 2205 Stainless Steel

Author

Cheng, Xuequn ; Li, Xiaogang ; Dong, Chaofang

Author_Institution

Corrosion & Protection Center, Univ. of Sci. & Technol. Beijing, Beijing, China

fYear

2010

fDate

28-31 March 2010

Firstpage

1

Lastpage

4

Abstract

Corrosion sensitivity of 2205 and 316L stainless steel in 3.5% NaCl solution was studied by potentiodynamic polarization, EIS and Mott-Schottky. The results show that the 2205 duplex stainless steel has better corrosion resistance than 316L stainless steel and the results of EIS spectra measurements in different formation potential shows that the thickness of passive film formed on 2205 SS is on average thicker than that on 316L SS under the same formation potential. Further investigation by Mott-Schottky analysis proves that the diffusivity of the point defects was 3.67Ã—10^-15 cm²/s for 316L SS and 2.8Ã—10^-16 cm²/s for 2205 SS, it shows that the Dd value of 2205 SS decreases about ten times compared with that of 316L SS, a less-defective passive film can be formed on the 2205 duplex stainless steel.

Keywords

austenitic stainless steel; corrosion resistance; diffusion; point defects; thin films; 2205 stainless steel; 3.5% NaCl solution; 316L stainless steel; FeCCrJk; Mott-Schottky analysis; corrosion sensitivity; diffusivity; passive film; point defects; potentiodynamic polarization; Chemical industry; Chromium; Corrosion; Electrodes; Ferrite films; Iron; Metals industry; Polarization; Shipbuilding industry; Steel;

fLanguage

English

Publisher

ieee

Conference_Titel

Power and Energy Engineering Conference (APPEEC), 2010 Asia-Pacific

Conference_Location

Chengdu

Print_ISBN

978-1-4244-4812-8

Electronic_ISBN

978-1-4244-4813-5

Type

conf

DOI

10.1109/APPEEC.2010.5449197

Filename

5449197