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Journal of Chinese Society for Corrosion and protection  2022, Vol. 42 Issue (5): 771-778    DOI: 10.11902/1005.4537.2021.232
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Aerobic Corrosion Process of Q235 Steel in NaHCO3 Solutions
XUE Fang(), LIU Liangyu, TAN Long
Naval Architecture and Port Engineering College, Shandong Jiaotong University, Weihai 264200, China
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Abstract  

The activation- and passivation-behavior of Q235 low carbon steel was investigated by means of mass loss measurement, electrochemical measurements, and surface characterization techniques. Results show that in NaHCO3 solutions, the corrosion behavior of low carbon steel in the initial stage was quite different from that in the last stage, especially in the solutions of low NaHCO3 concentrations, which may be related to the variation of corrosion products formed on the surface of the steel. HCO3- could influence the corrosion kinetics of Q235 steel in naturally aerated conditions. When the content of HCO3- was limited, the anodic/cathodic reactions were determined by charge transfer process, while by diffusion process in solutions with high concentrations of HCO3-. The corrosion rate of Q235 steel was affected by the morphology and compactness of corrosion products in NaHCO3 solutions with different HCO3- concentrations. High concentration of HCO3- was beneficial to the formation of compact corrosion products, which could diminish the corrosion rate of low carbon steel.
Key words:  Q235 low carbon steel      HCO3- concentrations      activation/passivation      corrosion dynamics      corrosion products     
Received:  03 September 2021     
ZTFLH:  TG174  
Fund: Startup Foundation for Docotors of Shandong Jiaotong University(BS2018003)
Corresponding Authors:  XUE Fang     E-mail:  fxue12s@alum.imr.ac.cn
About author:  XUE Fang, E-mail: fxue12s@alum.imr.ac.cn
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Fang XUE
Liangyu LIU
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Cite this article: 

XUE Fang, LIU Liangyu, TAN Long. Aerobic Corrosion Process of Q235 Steel in NaHCO3 Solutions. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 771-778.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.232     OR     https://www.jcscp.org/EN/Y2022/V42/I5/771

Fig.1  Potentio-dynamic polarization curves of Q235 steel immersed in NaHCO3 solutions for 30 min (a) and 30 d (b)
Fig.2  Variation of OCP of Q235 steel with time during 30 d immersion in NaHCO3 solutions
Fig.3  Evolutions of EIS of Q235 steel during 30 d immersion in 0.01 mol/L (a), 0.1 mol/L (b) and 1 mol/L (c) NaHCO3 solutions
Immersion time / dRs / Ω·cm2Ydl / mS·s n ·cm-2nRct / Ω·cm2
1337.481.80×10-40.82778.87×103
2375.568.90×10-50.83092.71×105
3302.271.50×10-30.473231.26×103
5197.912.83×10-30.581441.14×103
8123.363.30×10-30.608571.33×103
1191.372.99×10-30.601782.61×103
2081.031.94×10-30.525532.69×103
2578.172.89×10-30.553795.21×103
3051.922.22×10-30.633093.78×103
Table 1  Fitting results of EIS data of Q235 steel after immersion in 0.01 mol/L NaHCO3 solution
Immersion time / dRs / Ω·cm2Ydl / mS·s n ·cm-2nRct / Ω·cm2Yw / mS·s n ·cm-2
143.268.5×10-50.84061.42×105---
250.635.5×10-50.87433.58×1042.09×10-7
350.954.0×10-50.90176.58×1048.78×10-7
549.183.5×10-50.91215.63×1041.11×10-6
846.763.3×10-50.91122.95×1041.64×10-7
1144.903.3×10-50.90461.98×1047.37×10-7
2040.489.3×10-50.85422.05×1033.51×10-4
2539.798.4×10-50.86291.96×1031.65×10-5
3037.071.1×10-40.83321.52×1031.95×10-3
Table 2  Fitting results of EIS data of Q235 steel after immersion in 0.1 mol/L NaHCO3 solution
Immersion time / dL / H·cm2Rs / Ω·cm2Ydl / mS·s n ·cm-2nRct / Ω·cm2Yw / mS·s n ·cm-2
11.19×10-68.5041.05×10-40.90452.81×1042.13×10-23
21.25×10-67.4398.18×10-50.92363.24×1046.66×10-17
31.25×10-67.9047.40×10-50.92952.99×1044.31×10-19
51.34×10-67.6527.18×10-50.93302.36×1045.93×10-18
81.38×10-65.2737.18×10-50.92972.26×1042.50×10-17
111.68×10-67.5397.32×10-50.92871.72×1041.89×10-17
151.39×10-66.1377.56×10-50.92361.37×1042.38×10-18
201.16×10-64.4608.46×10-50.90802.52×1041.31×10-17
251.40×10-64.9898.18×10-50.91674.50×1032.70×10-20
301.36×10-65.0338.84×10-50.91112.33×1036.52×10-24
Table 3  Fitting results of EIS data of Q235 steel after immersion in 1 mol/L NaHCO3 solution
Fig.4  Equivalent circuits for fitting EIS of Q235 steel during immersion in 0.01 mol/L (a), 0.1 mol/L (b) and 1 mol/L (c) NaHCO3 solutions
Fig.5  Surface morphologies of Q235 steel immersed for 30 d in 0.01 mol/L (a), 0.1 mol/L (b) and 1 mol/L (c) NaHCO3 solutions
Fig.6  E-pH diagrams of Fe-H2O-CO2 in 0.01 mol/L[28] (a) and 0.1 mol/L[29] (b) NaHCO3 solutions
Fig.7  Schematic diagrams of corrosion mechanism of Q235 steel during immersion in 0.01 mol/L (a) and 0.1 mol/L (b) NaHCO3 solutions
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