Stress Corrosion Cracking Behavior of 316L Stainless Steel with Varying Microstructure in Ammonium Chloride Environment

doi:10.11902/1005.4537.2020.172

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (6): 811-818 DOI: 10.11902/1005.4537.2020.172

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Stress Corrosion Cracking Behavior of 316L Stainless Steel with Varying Microstructure in Ammonium Chloride Environment

SUN Baozhuang¹, ZHOU Xiaocheng¹, LI Xiaorong², SUN Weilu³, LIU Zirui¹, WANG Yuhua⁴, HU Yang⁴, LIU Zhiyong¹(

)

^1.National Materials Corrosion and Protection Science Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
^2.Tianjin Dagang Oilfield Group Engineering Construction Co. Ltd. , Tianjin 300280, China
^3.College of Economics and Management, Tianjin University of Science & Technology, Tianjin 300222, China
^4.SINOPEC Qilu Petrochemical Company, Zibo 255434, China

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Abstract

The stress corrosion cracking (SCC) behavior in NH₄Cl solutions was studied by means of potentiodynamic polarization measurement, electrochemical impedance spectra (EIS) measurement for 316L stainless steel with microstructures corresponding with different status of the steel, including as-received, solid solution- and sensitization-treatment. The results show that 316L stainless steels exert high SCC susceptibility in NH₄Cl containing environment, which increases in the order of as-received, solid solution- and sensitization-treatment. With the rising NH₄Cl concentration, the stability of passive film degrades, the passive current density increases, the breakdown potential and polarization resistance decline. In particular, in the saturated NH₄Cl solution, pits are prone to initiate, which leads to the occurrence of SCC. In NH₄Cl solution, SCC of 316L stainless steel is dominated by anodic dissolution (AD) process, and the SCC cracks propagate transgranularly.

Key words: 316L stainless steel ammonium chloride environment heat treatment stress corrosion cracking

Received: 23 September 2020

ZTFLH:

TG172

Fund: National Key R&D Program of China(2017YFF0210404)

Corresponding Authors: LIU Zhiyong E-mail: liuzhiyong7804@126.com

About author: LIU Zhiyong, E-mail: liuzhiyong7804@126.com

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	Baozhuang SUN
	Xiaocheng ZHOU
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	Weilu SUN
	Zirui LIU
	Yuhua WANG
	Yang HU
	Zhiyong LIU

Cite this article:

SUN Baozhuang, ZHOU Xiaocheng, LI Xiaorong, SUN Weilu, LIU Zirui, WANG Yuhua, HU Yang, LIU Zhiyong. Stress Corrosion Cracking Behavior of 316L Stainless Steel with Varying Microstructure in Ammonium Chloride Environment. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 811-818.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.172 OR https://www.jcscp.org/EN/Y2021/V41/I6/811

Fig.1 Morphologies of 316L stainless steel under different heat treatment processes: (a) as-received microstructure, (b) solid-solution microstructure, (c) sensitized microstructure

Fig.2 Dynamic potential polarization curves of 316L stainless steel under different heat treatment in different^{concentration NH₄Cl solutions: (a) as-received microstructure, (b) solid-solution microstructure, (c) sensitized microstructure}

Fig.3 E_b (a) and I_corr (b) fitting results of 316L stainless steel under different heat treatment in different concentration NH₄Cl solutions

Fig.4 Electrochemical impedance spectroscopy of 316L stainless steel under different heat treatment in different concentration NH₄Cl solutions: (a) as-received microstructure, (b) solid-solution microstructure, (c) sensitized microstructure, (d) fitting polarization resistance

Fig.5 Equivalent fitting circuit of electrochemical imped-ance spectroscopy

Fig.6 Microscopic morphologies of 316L stainless steel U-bend specimens immersed in 0.1% (a1~c1), 5% (a2~c2), 10% (a3~c3) and saturated solution (a4~c4) concentrations of boiling NH₄Cl solution for 30 d: (a) as-received microstru-cture, (b) solid-solution microstructure, (c) sensitized microstructure

Fig.7 SEM images of cracking propagation (a, b, d) and composition analysis (c) in 316L stainless steel under different heat treatment in saturated NH₄Cl boiling solution: (a) as-received microstructure, (b) solid-solution microstructure, (c) sensitized microstructure

Fig.8 SEM images of crack growth along the thickness of 316L stainless steel under different heat treatment in saturated NH₄Cl boiling solution: (a) as-received microstructure, (b) solid-solution microstructure, (c) sensitized microstructure

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