Effect of S2- on Corrosion Behavior of A710 Steel in NaCl Solution

doi:10.11902/1005.4537.2017.170

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (3): 233-240 DOI: 10.11902/1005.4537.2017.170

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Effect of S^2- on Corrosion Behavior of A710 Steel in NaCl Solution

Yukun WANG^1,², Jing LIU¹(

), Qian HU¹, Feng HUANG¹

1 State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2 Steel Common Synergy Innovation Center, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

The corrosion behavior of A710 steel in high S^2- containing 3.5% (mass fraction) NaCl solutions was investigated by means of weight loss measurement, electrochemical measurement, FE-SEM and XRD. Results showed that the addition of S^2- could promote the activation of the steel surface, which in turn leads to the increase of passivation current density. The corrosion product scale formed in the S^2- containing NaCl solutions was loose with pores and cracks, while pitting corrosion occurred beneath the corrosion product scale.

Key words: high-strength steel S^2- marine environment pitting

Received: 17 October 2017

ZTFLH:

TG142.71

Fund: Supported by Hubei Science and Technology Support Plan Project (2015BAA083)

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Cite this article:

Yukun WANG, Jing LIU, Qian HU, Feng HUANG. Effect of S^2- on Corrosion Behavior of A710 Steel in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 233-240.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.170 OR https://www.jcscp.org/EN/Y2018/V38/I3/233

Fig.1 Average corrosion rates of A710 steel after immersion in two solutions for different time

Fig.2 Surface micro-morphologies of A710 steel after immersing in 3.5%NaCl solution for 1 d (a), 4 d (b), 16 d (c) and 32 d (d)

Fig.3 Surface micro-morphologies of A710 steel after immersing in 400 mg/L Na₂S+3.5%NaCl solution for 1 d (a), 4 d (b),16 d (c) and 32 d (d)

Fig.4 Cross sections of A710 steel after immersion in 3.5%NaCl (a) and 400 mg/L Na₂S+3.5%NaCl (b) solutions for 32 d

Fig.5 Corrosion morphologies of A710 steel after immersed in 400 mg/L Na₂S+3.5%NaCl solution for 1 d (a), 4 d (b), 16 d (c) and 32 d (d)

Fig.6 XRD spectra of corrosion products of A710 steel after immersion in 3.5%NaCl (a) and 400 mg/L Na₂S+3.5%NaCl (b) solutions for 16 and 32 d

Fig.7 Potentiodynamic polarization curves of A710 steel after immersed in 3.5%NaCl (a) and 400 mg/L Na₂S+3.5%NaCl (b) solutions for different time

Table 1 E_corr and passivation potential range of A710 steel after immersed in two solutions for different time

Fig.8 Blunted current densities of A710 steel after immersed in two solutions for different time

Fig.9 Effect of S^2- on the corrosion process of A710 steel in 3.5%NaCl solution

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