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Journal of Chinese Society for Corrosion and protection  2022, Vol. 42 Issue (2): 331-337    DOI: 10.11902/1005.4537.2021.061
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Corrosion of Stainless Steel Shell of Embedded Sensor in Tailings Pond
WANG Qixuan1, LYU Wensheng2(), YANG Peng2,3, ZHU Liyi2, LIAO Wenjing1, ZHU Yuanle1
1.State Key Laboratory of Safety Technology for Metal Mines, Changsha Institute of Mining Research Co. Ltd. , Changsha 410012, China
2.Beijing University of Science and Technology College of Civil Engineering and Resources, Beijing 100083, China
3.Key Laboratory of Beijing Information Service Engineering, Beijing Union University, Beijing 100101, China
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Abstract  

Aiming at the problem related with serious corrosion and large economic loss of embedded monitoring instruments or sensors in different underground environments, the corrosion behavior of shell material (316L stainless steel) of embedded monitoring sensors in acid- and brine-containing simulated environments of tailings ponds were studied by means of coupon immersion with mass loss method, electrochemical measurement and scanning electron microscopy (SEM). The results show that in the acid containing artificial solution of pH1.5, the passive film is gradually formed on the 316 SS surface in a short period of time, and the corrosion resistance is getting better and better. However, the corrosion resistance of the 316SS is slightly reduced after a long-term immersion corrosion. In the artificial solution containing mixed sulfuric acid and brine of pH3, and that containing brine of pH7.5 respecyively, the corrosion resistance of the 316SS is better in the short term The existence of corrosive Cl- in brine accelerated the dissolution and destruction of the passive film, and the corrosion resistance decreased significantly.
Key words:  tailings pond      316L stainless steel      corrosion rate      polarization curve      electrochemical impedance spectroscopy     
Received:  26 March 2021     
ZTFLH:  TG174  
Fund: National Key Research and Development Program of China(2017YFC0804604);Work Safety Prevention and Emergency Project of Emergency Management Department of Hunan Province(Hunan-201905)
Corresponding Authors:  LYU Wensheng     E-mail:  sunluw@sina.com
About author:  LYU Wensheng, E-mail: sunluw@sina.com
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Qixuan WANG
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WANG Qixuan, LYU Wensheng, YANG Peng, ZHU Liyi, LIAO Wenjing, ZHU Yuanle. Corrosion of Stainless Steel Shell of Embedded Sensor in Tailings Pond. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 331-337.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.061     OR     https://www.jcscp.org/EN/Y2022/V42/I2/331

Fig.1  Shape and sizes of 316L stainless steel sample
pHNa+K+Ca2+Mg2+Cl-SO42-NO3-
310978.3373.4741.61607.316016.04076.338.0
7.59469.9340.31311.11250.015931.42333.638.7
Table 1  Concentrations of main ions in pH3 and pH7.5 corrosion simulation solutions (mg·L-1)
Fig.2  General view (a) and high magnification (b) view of the surface of 316L stainless steel sample before immersion test
Fig.3  Surface morphologies of 316L stainless steel after immersion for 7 d in the simulated solutions with pH1.5 (a), pH3 (b) and pH7.5 (c)
Fig.4  Surface morphologies of 316L stainless steel sample after immersion for 4 m (a1, b1, c1) and 12 m (a2, b2, c2) in pH1.5 (a), pH3 (b) and pH7.5 (c) simulated solutions
Fig.5  Variations of corrosion rate of 316L stainless steel with immersion time in three simulated solutions
Fig.6  Polarization curves of 316L stainless steel after immersion for different time in pH1.5 (a), pH3 (b) and pH7.5 (c) simulated solutions
pHSoaking time / dEbVSCEEcorrVSCEIcorrμA∙cm-2pHSoaking time / dEbVSCEEcorrVSCEIcorrμA∙cm-2pHSoaking time / dEbVSCEEcorrVSCEIcorrμA∙cm-2
00.763-0.1471.41000.256-0.3261.93300.224-0.1670.096
70.7950.0160.11670.3900.0340.02770.541-0.0450.106
150.8010.0340.148150.512-0.1210.018150.353-0.0860.127
1.5300.8400.1600.1203300.525-0.1160.1537.5300.477-0.1330.038
600.8360.0230.191600.4200.0270.082600.550-0.0800.071
1200.8100.1110.1031200.397-0.1650.1701200.456-0.1760.171
3600.8120.0130.2613600.480-0.2940.8753600.530-0.2390.698
Table 2  Fitting electrochemical parameters of polarization curves of 316L stainless steel after immersion for different time in three simulated solutions
Fig.7  Nyquist (a, c, e) and Bode (b, d, f) diagrams of 316L stainless steel samples after immersion for different time in three simulated solutions with pH1.5 (a, b), pH3 (c, d) and pH7.5 (e, f)
Fig.8  Equivalent circuit diagram of EIS
pH

Soaking

time

Rs

Ω·cm2

C1

Ω-1·cm-2·s-n

R1

Ω·cm2

C2

Ω-1·cm-2·s-n

R2

Ω·cm2

1.50 d4.83×1021.99×10-47.40×1033.04×10-42.29×104
7 d5.47×1029.97×10-51.34×1044.08×10-52.87×105
15 d6.78×1021.23×10-41.36×1045.41×10-52.23×105
30 d7.16×1019.63×10-54.26×1034.15×10-51.83×105
60 d8.49×1019.68×10-55.94×1034.38×10-53.17×105
120 d7.11×1017.32×10-55.86×1033.44×10-54.57×105
360 d1.01×1028.84×10-51.16E+044.55×10-51.39×105
30 d4.15×1011.17×10-44.17×1032.39×10-42.20×104
7 d4.02×1016.12×10-51.75×1034.81×10-52.25×105
15 d4.54×1015.49×10-52.70×1034.30×10-51.86×105
30 d3.36×1015.26×10-51.60×1035.31×10-52.44×105
60 d2.12×1026.70×10-55.83×1034.93×10-53.46×105
120 d3.51×1014.86×10-52.48×1035.82×10-51.36×105
360 d5.59×1019.49×10-52.97×1039.19×10-51.01×105
7.50 d4.15×1012.85×10-51.07×1042.20×10-51.65×105
7 d4.91×1023.03×10-54.31×1043.56×10-51.68×105
15 d4.50×1013.04×10-57.90×1032.21×10-51.21×105
30 d3.64×1012.20×10-51.48×1041.16×10-54.98×105
60 d4.97×1012.52×10-51.45×1041.02×10-57.36×105
120 d3.98×1013.08×10-51.03×1042.33×10-51.97×105
360 d4.88×1013.66×10-51.19×1045.55×10-58.95×104
Table 3  Fitting results of EIS of 316L stainless steel samples immersed for different time in three simulated solutions
Fig.9  Variations of polarization resistance RP of 316L stainless steel with immersion time in pH1.5 (a), pH3 (b) and pH7.5 (c) simulated solutions
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