Effect of Microstructure Partition on Micro-polarization Behavior and Pitting Resistance of Duplex Stainless Steel

doi:10.11902/1005.4537.2020.210

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (5): 667-672 DOI: 10.11902/1005.4537.2020.210

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Effect of Microstructure Partition on Micro-polarization Behavior and Pitting Resistance of Duplex Stainless Steel

WANG Yicong, HU Qian, HUANG Feng, LIU Jing(

)

State Key Laboratory of Refractories and Metallurgy, Hubei Engineering Technology Research Center of Materials and Service Safety, Wuhan University of Science and Technology, Wuhan 430081, China

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Abstract

2205 Duplex stainless steels (DSS) with different volume ratio of ferrite to austenite were prepared by solution treatment. Then their micro-polarization behavior and pitting resistance were studied by means of electrochemical measurement, micro-polarization measurement and corrosion morphology analysis. The effect of electrochemical activity of single α and γ phase on pitting resistance of 2205 DSS was also examined. Results show that the alloying element content and phase fraction of two phases changed after solution treatment, which influenced the micro-electrochemical activity of two phases and galvanic effect between two phases. When the phase fraction of α is 60.8%, the steel of two phases showed the highest corrosion potential, the lowest corrosion current density and the weakest galvanic effect. The 2205 DSS, in this case, possesses the best pitting resistance.

Key words: duplex stainless steel pitting microstructure partition micro-polarization

Received: 26 October 2020

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51871171)

Corresponding Authors: LIU Jing E-mail: liujing@wust.edu.cn

About author: LIU Jing, E-mail: liujing@wust.edu.cn

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Cite this article:

WANG Yicong, HU Qian, HUANG Feng, LIU Jing. Effect of Microstructure Partition on Micro-polarization Behavior and Pitting Resistance of Duplex Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 667-672.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.210 OR https://www.jcscp.org/EN/Y2021/V41/I5/667

Fig.1 Microstructures of 2205 DSS: (a) 1#, (b) 2#, (c) 3#, (d) 4#, (e) 5#, (f) 6#

Table 1 Volume fraction and element composition of two phases

Fig.4 Corrosion morphologies of six samples after potentiostatic polarization: (a) 1#, (b) 2#, (c) 3#, (d) 4#, (e) 5#, (f) 6#

Fig.5 Pits density in α and γ phase for six samples

Fig.6 Micro-potentiodynamic polarization of single phases of 1#, 3# and 5#

Fig.7 Corrosion morphologies of 3# sample after micro-potentiodynamic polarization: (a) α, (b) γ

Fig.2 Polarization curves of six different 2205 DSS samples in 60 ℃ 3.5%NaCl solution

Fig.3 E_pit of different 2205 DSS samples

Table 2 Fitting parameters of micro-polarization curves for 1#, 3# and 5# samples

Fig.8 PREN and E_pit of α and γ in different samples

Table 3 Parameters influencing micro-galvanic effect between two phases

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