Electrochemical Properties and Offshore Corrosion Behavior of SAF 2304 Duplex Stainless Steel

doi:10.11902/1005.4537.2022.217

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 630-638 DOI: 10.11902/1005.4537.2022.217

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Electrochemical Properties and Offshore Corrosion Behavior of SAF 2304 Duplex Stainless Steel

HUANG Jiazhen¹^,², HUANG Tao², YANG Lijing²(

), JI Dengping³, DING He³, WEI Yi¹, SONG Zhenlun²

^1.College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310000, China
^2.Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
^3.Zhejiang Qingshan Iron & Steel Co. Ltd., Lishui 323903, China

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Abstract

Electrochemical properties and real-sea corrosion behavior of duplex stainless steel SAF 2304 in a test site located in the Zhoushan area of the East China Sea, with a depth of about 10 m were assessed by mean of mass loss measurement, electrochemical tests, optical microscopy (OM) and scanning electron microscopy (SEM) and compared with carbon steel. The electrochemical test results show that the free corrosion potential of carbon steel is -0.857 V_SCE, the passive current density is 87.30 μA‧cm^-2, the capacitive arc radius is small, and the corrosion resistance is poor. SAF 2304 duplex stainless steel is stable for a long time in the open circuit potential of 3.5%NaCl solution, the free corrosion potential is -0.369 V_SCE, the passive current density is 18.03 μA‧cm^-2, the capacity of the arc resistance is large, and the corrosion resistance is good. In the real sea exposure experiment, the corrosion rate of SAF 2304 duplex stainless steel is much smaller than that of carbon steel. With the increase of exposure time, a relatively compact scale composed of Ca and Mg containing deposits and SiO₂ may further form on the pre-formed metal oxide film, and all the corrosion products are tightly adhered to the substrate, therefore, provides protective effect to a certain extent for the steel, and the corrosion morphology is uniformly corroded.

Key words: duplex stainless steel electrochemistry real sea corrosion behavior

Received: 01 July 2022 32134.14.1005.4537.2022.217

ZTFLH:

TG27

Fund: Zhejiang Science and Technology Plan Project(2022C01192);Zhejiang Science and Technology Plan Project(2021C01082)

Corresponding Authors: YANG Lijing, E-mail: yanglj@nimte.ac.cn

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Cite this article:

HUANG Jiazhen, HUANG Tao, YANG Lijing, JI Dengping, DING He, WEI Yi, SONG Zhenlun. Electrochemical Properties and Offshore Corrosion Behavior of SAF 2304 Duplex Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 630-638.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.217 OR https://www.jcscp.org/EN/Y2023/V43/I3/630

Fig.1 XRD patterns of SAF 2304 duplex stainless steel

Fig.2 Metallographs of cross-section (a) and longitudinal section (b) and SEM images of cross-section (c) and longitudinal section (d) of SAF 2304 duplex stainless steel

Fig.3 Open circuit potential of SAF 2304 duplex stainless steel in 3.5%NaCl solution

Fig.4 Polarization curves (a) and EIS results (b) of carbon steel and SAF 2304 duplex stainless steel in 3.5%NaCl solution

Fig.5 Mass loss rate (a) and mass gain rate (b) of carbon steel and SAF 2304 duplex stainless steel after immersion in Zhoushan offshore

Fig.6 Corrosion morphologies of carbon steel after immersion in Zhoushan offshore with 30 d (a), 90 d (b), 180 d (c) and 360 d (d) exposure time

Fig.7 Corrosion morphologies of SAF 2304 duplex stainless steel after immersion in Zhoushan offshore with 30 d (a), 90 d (b), 180 d (c) and 360 d (d) exposure time

Table 1 EDS elemental composition analysis of corresponding position surfaces in Fig.6 (atomic fraction / %)

Table 2 EDS elemental composition analysis of corresponding position surfaces in Fig.7 (atomic fraction / %)

Fig.8 Cross-section morphologies and EDS of corrosion morphologies formed on carbon steel (a) and SAF 2304 duplex stainless steel (b) after immersion in Zhoushan offshore for 12 months

Fig.9 Surface morphologies of carbon steel after removing corrosion products after immersion in Zhoushan offshore with 30 d (a), 90 d (b), 180 d (c) and 360 d (d) exposure time

Fig.10 Surface morphologies of SAF 2304 duplex stainless steel after removing corrosion products after immersion in Zhoushan offshore with 30 d (a), 90 d (b), 180 d (c) and 360 d (d) exposure time

Fig.11 X-ray diffraction patterns of corrosion products of carbon steel and SAF 2304 duplex stainless steel after immersion for 12 months

Fig.12 FTIR spectra of corrosion products of carbon steel and SAF 2304 duplex stainless steel after immersion for 12 months

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