Influence of Cl- Concentration on Stress Corrosion Cracking Behavior of 316L Stainless Steel in Alkaline NaCl/Na2S Solution

doi:10.11902/1005.4537.2016.206

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (6): 526-532 DOI: 10.11902/1005.4537.2016.206

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Influence of Cl^- Concentration on Stress Corrosion Cracking Behavior of 316L Stainless Steel in Alkaline NaCl/Na₂S Solution

Xiaocheng ZHOU, Qiaoqi CUI, Jinghuan JIA, Zhiyong LIU(

), Cuiwei DU

Corrosion & Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

The effect of Cl^- concentration on stress corrosion cracking (SCC) in alkaline solutions of NaCl/Na₂S was assessed by means of slow strain rate test (SSRT) and U-type bending immersion test, as well as measurements of potentiodynamic polarization, electrochemical impedance spectra (EIS). 316L stainless steel exhibits SCC susceptibility to a certain extent in alkaline NaCl/Na₂S solution, while Cl^- and S^2- have a competitive effect on the corrosion process of 316L stainless steel, resulting in the extreme value of electrochemical impedance. With the increasing of Cl^- concentration, the effect of hydrogen-induced plasticity (HIP) can increase the elongation to a certain extent and decrease the plastic loss of 316L stainless steel, but it has little effect on the tensile strength of 316L stainless steel.

Key words: 316L stainless steel alkaline solution Cl^- S^2- stress corrosion cracking

Received: 23 October 2016

ZTFLH:

TG178

Fund: Supported by National Natural Science Foundation of China (51471034 and 51771028)

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Cite this article:

Xiaocheng ZHOU, Qiaoqi CUI, Jinghuan JIA, Zhiyong LIU, Cuiwei DU. Influence of Cl^- Concentration on Stress Corrosion Cracking Behavior of 316L Stainless Steel in Alkaline NaCl/Na₂S Solution. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 526-532.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.206 OR https://www.jcscp.org/EN/Y2017/V37/I6/526

Fig.1 Specimen sizes of SSRT (a) and U-bend (b)

Fig.2 Nyquist plots of 316L stainless steel in alkaline NaCl/Na₂S solutions with different Cl^- concentrations

Fig.3 Equivalent circuit used for modeling

Fig.4 Variations of charge transfer resistance R_ct and corrosion resistance R_f with Cl^- concentration

Fig.5 Potentiodynamic polarization curves (a), passivation region I (b) and passivation-break region II (c) of 316L stainless steel in alkaline NaCl/Na₂S solutions with different Cl^- concentrations

Fig.6 Fitting values of E_b and I_main of 316L stainless steel in alkaline NaCl/Na₂S solutions with different Cl^- concentrations

Fig.7 SSRT curves of 316L stainless steel in alkaline NaCl/Na₂S solutions with different Cl^- concentrations

Fig.8 Losses of elongation and reduction of area of 316L stainless steel in alkaline NaCl/Na₂S solutions with different Cl^- concentrations

Fig.9 Fracture apperances of 316L stainless steel in air (a, b) and in alkaline NaCl/Na₂S solutions with 500 mg/L (c, d), 35000 mg/L (e, f) and 50000 mg/L (g, h) Cl^-

Fig.10 Corrosion morphologies of 316L stainless steel after U-bending tests for 30 d in alkaline NaCl/Na₂S solutions with 500 mg/L (a, b), 5000 mg/L (c, d), 35000 mg/L (e, f) and 50000 mg/L (g, h) Cl^-

Fig.11 S^2- and Cl^- induced surface destructions of 316L stainless steel under different conditions: (a) complete passivation film, (b) hydrolysis process of S^2- and generation of FeS, (c) competitive adsorption of S^2- and Cl^-, (d) replacement of S^2- by Cl^-

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