Electrochemical Corrosion and Critical Pitting Temperature of S32750 Super Duplex Stainless Steel in NaCl Solution

doi:10.11902/1005.4537.2014.035

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (2): 106-112 DOI: 10.11902/1005.4537.2014.035

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Electrochemical Corrosion and Critical Pitting Temperature of S32750 Super Duplex Stainless Steel in NaCl Solution

HE Jin^1,², YAN Minsheng^1,², YANG Lijing², Masoumeh Moradi², SONG Zhenlun², JIANG Yehua¹(

)

1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
2. Key Laboratory of Marine New Materials and Related Technology, Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China

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Abstract

The electrochemical corrosion behavior and critical pitting temperature (CPT) of S32750<br>super duplex stainless steel in 3.5%NaCl solution were investigated by electrochemical techniques. The morphologies of the steel before after pitting corrosion were observed by scanning electron microscope. The CPT of the S32750 steel was identified as 71 ℃. A passive film could form on the steel surface when the solution temperature was below the CPT. While, when the solution temperature was above the CPT, pitting corrosion occurred on the steel surface as the result of the breakdown of the passive film due to the increase of the Cl^- activity. Pitting corrosion became more serious with the increasing temperature. Moreover, the corrosion models of the steel below and above the CPT were sketched respectively.

Key words: duplex stainless steel critical pitting temperature passivation corrosion

Received: 12 March 2014

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	Jin HE
	Minsheng YAN
	Lijing YANG
	Moradi Masoumeh
	Zhenlun SONG
	Yehua JIANG

Cite this article:

HE Jin, YAN Minsheng, YANG Lijing, Masoumeh Moradi, SONG Zhenlun, JIANG Yehua. Electrochemical Corrosion and Critical Pitting Temperature of S32750 Super Duplex Stainless Steel in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 106-112.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.035 OR https://www.jcscp.org/EN/Y2015/V35/I2/106

Fig.1 Microstructure of duplex stainless steel S32750

Fig.2 Potentiodynamic polarization curves of duplex stainless steel S32750 in 3.5%NaCl solution

Fig.3 Curves of corrosion current density and polarization resistance (a) and breakdown resistance of the passive film (b) vs temperature, respectively

Fig.4 Current density of duplex stainless steel S32750 vs temperature at 0.6 V (vs SCE)

Fig.5 EIS results of duplex stainless steel S32750 at different temperatures in NaCl solution at applied bias voltage of 0.6 V (vs SCE)

Fig.6 Equivalent circuits of the corrosion process of duplex stainless steel S32750 at below (a) and above (b) CPT

Fig.7 Variation of the charge transfer resistance with temperature for the passive film

Table 1 Equivalent parameters obtained by fitting the EIS

Fig.8 Relationship between DC-removal noise and temperature

Fig.9 SEM images of duplex stainless steel S32750 before corrosion (a) and after corrosion at 65 ℃ (b), 75 ℃ (c) and 85 ℃ (d) in NaCl solution at applied bias voltage of 0.6 V (vs SCE)

Fig.10 Relationship diagram between anode polarization current density and temperature under passivation potential of 0.6 V (vs SCE)

Fig.11 Passivation and pitting corrosion model of duplex stainless steel S32750 below (a) and

above (b) CPT

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