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| CALCULATION AND ANALYSIS OF DIFFUSIVITY OF POINT DEFECTS IN PASSIVE FILM FORMED ON 2205 DUPLEX STAINLESS STEEL AND 316L AUSTENITIC STAINLESS STEEL |
| LIU Zuojia1, CHENG Xuequn1, LIU Xiaohui2, LI Xiaogang1 |
1. Corrosion and Protection Centre, University of Science and Technology Beijing, Beijing 100083
2. Safety & Engineering Academy of SINOPEC, Qingdao 266071 |
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Abstract The diffusivity of point defects in the passive film formed on 2205 duplex stainless steel and 316L stainless steel in NaCl solution was calculated by means of capacitance measurement and PDM (point defect model). The calculated result was testified and analyzed by experimental steady current density of passive film and PDM. It is showed that the order of magnitude of diffusivity is about 10-23 cm2/s~10-20 cm2/s, and the diffusivity of 2205 DSS is less than 316L SS in simulated ocean solution. It is concluded that the diffusion of point defect which is caused by oxygen vacancy in 2205 DSS is harder than 316L SS, so in contrast to 316L SS, the passive film of 2205 DSS is much densified and compact with completeness and excellent protection.
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Received: 29 June 2009
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Corresponding Authors:
Liu Zuojia
E-mail: lzandj@yahoo.com.cn
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Cite this article:
LIU Zuojia, CHENG Xuequn, LIU Xiaohui, LI Xiaogang. CALCULATION AND ANALYSIS OF DIFFUSIVITY OF POINT DEFECTS IN PASSIVE FILM FORMED ON 2205 DUPLEX STAINLESS STEEL AND 316L AUSTENITIC STAINLESS STEEL. J Chin Soc Corr Pro, 2010, 30(4): 273-277.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I4/273
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