Effect of Temperature on Pitting Corrosion Behavior of 316L Stainless Steel in Oilfield Wastewater

doi:10.11902/1005.4537.2020.257

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (1): 143-148 DOI: 10.11902/1005.4537.2020.257

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Effect of Temperature on Pitting Corrosion Behavior of 316L Stainless Steel in Oilfield Wastewater

ZHANG Wenli¹, ZHANG Zhenlong², WU Zhaoliang², HAN Sike¹, CUI Zhongyu¹(

)

^1.School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
^2.Xinjiang Baomo Environmental Engineering Co. Ltd. , Karamay 834000, China

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Abstract

The corrosion behavior of 316L stainless steel in an artificial oilfield wastewater at different temperatures was studied by potentiodynamic polarization measurement and SEM analysis. At the same time, the point defect model (PDM) was used to explain the pitting corrosion behavior of stainless steel. The results show that as the temperature of the oilfield wastewater increases, the pitting sensitivity increases and the pitting potential decreases for the 316L stainless steel. The experimental results of the pitting potential and the square root of the potential scanning rate at different temperatures were analyzed by PDM. The PDM combined with the competitive adsorption theory and the formation mechanism of cation vacancies at the passive film/solution interface can successfully explain the results of this paper.

Key words: 316L stainless steel oilfield wastewater pitting corrosion point defect model

Received: 09 December 2020

ZTFLH:

TG172

Fund: Key R&D Program Public Welfare Special Fund Shandong Province(2019GHY112050)

Corresponding Authors: CUI Zhongyu E-mail: cuizhongyu@ouc.edu.cn

About author: CUI Zhongyu, E-mail: cuizhongyu@ouc.edu.cn

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Cite this article:

ZHANG Wenli, ZHANG Zhenlong, WU Zhaoliang, HAN Sike, CUI Zhongyu. Effect of Temperature on Pitting Corrosion Behavior of 316L Stainless Steel in Oilfield Wastewater. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 143-148.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.257 OR https://www.jcscp.org/EN/Y2022/V42/I1/143

Fig.1 Potentiodynamic polarization curves of 316L stainless steel in oilfield wastewater at different temperatures

Fig.2 Potentiodynamic polarization curves of 316L stainless steel repeated for 20 times in oilfield wastewater at 20 ℃ (a), 40 ℃ (b), 60 ℃ (c) and 80 ℃ (d)

Fig.3 Statistics results of V_c of 316L stainless steel repeated for 20 times in oilfield wastewater at 20 ℃ (a), 40 ℃ (b), 60 ℃ (c) and 80 ℃ (d)

Fig.4 Cumulative probability distribution of pitting potential of 316L stainless steel in oilfield wastewater at different temperatures

Fig.5 Relationship between critical pitting potential (mean value) and chloride ion concentration of 316L stainless steel in oilfield wastewater at different temperatures

Table 1 Polarizability and cation vacancy density of 316L stainless steel in oilfield wastewater at different temperatures

Fig.6 Relationship between the average pitting potential of 316L stainless steel in oilfield wastewater at different temperatures and the potential scanning rate

Fig.7 Pitting corrosion morphologies of 316 stainless steel after polarization at 20 ℃ (a), 40 ℃ (b), 60 ℃ (c) and 80 ℃ (d)

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