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Journal of Chinese Society for Corrosion and protection  2026, Vol. 46 Issue (1): 233-240    DOI: 10.11902/1005.4537.2025.096
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Corrosion Behavior of 40Cr Steel in 3.5%NaCl Solution Under Combined Effect of Stress and Ultraviolet Illumination
QIN Pengfei1, CUI Yu2, LIU Rui1, JU Pengfei3(), WANG Fuhui1, LIU Li1()
1.State Key Laboratory of Digital Steel, Northeastern University, Shenyang 110819, China
2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3.Shanghai Aerospace Equipment Manufacture, Shanghai 200245, China
Cite this article: 

QIN Pengfei, CUI Yu, LIU Rui, JU Pengfei, WANG Fuhui, LIU Li. Corrosion Behavior of 40Cr Steel in 3.5%NaCl Solution Under Combined Effect of Stress and Ultraviolet Illumination. Journal of Chinese Society for Corrosion and protection, 2026, 46(1): 233-240.

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Abstract  

The corrosion behavior of 40Cr steel in 3.5%NaCl solution under the combined effect of plastic tensile stress and ultraviolet (UV) illumination was investigated. The results demonstrate that UV illumination accelerates the corrosion of 40Cr steel, which is primarily attributed to the lower charge-transfer resistance and higher flat-band potential of the rust layer formed on the surface of the steel under illumination. Furthermore, the formation of a honeycomb inner rust layer under UV illumination facilitates the accumulation of NaCl within the rust layer. The rust layer formed on the surface of 40Cr steel under plastic tensile stress was more porous, exhibiting a higher photoelectric response and lower charge transfer resistance. These factors contributed to the accelerated anodic dissolution of 40Cr steel under the combined effect of plastic tensile stress and UV illumination.

Key words:  40Cr steel      plastic tensile stress      UV      NaCl     
Received:  24 March 2025      32134.14.1005.4537.2025.096
ZTFLH:  TG174  
Fund: National Natural Science Foundation of China(U20B2026)

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.096     OR     https://www.jcscp.org/EN/Y2026/V46/I1/233

Fig.1  Polarization curves of 0% strain and 6% strain 40Cr steel in 3.5%NaCl solution with and without illumination
Fig.2  Surface morphologies of 40Cr steel immersed in 3.5%NaCl solution for 120 h under different conditions: (a) 0% strain/dark, (b) 6% strain/dark, (c) 6% strain/UV
Fig.3  Rust layer morphologies of 40Cr steel immersed in 3.5%NaCl solution for 120 h under different experimental conditions: (a-h) 0% strain/dark, (i-l) 0% strain/UV, (c-f) EDS energy spectra in Fig.3b
Fig.4  XRD of surface rust layer of undeformed 40Cr steel after 120 h immersion in 3.5%NaCl solution
Fig.5  Raman diagram of the surface rust layer of 40Cr steel after immersion in 3.5%NaCl solution for 120 h
Fig.6  Nyquist plots (a) and Bode plots (b) of 40Cr steel after immersion in 3.5%NaCl solution for 120 h under dark without deformation, illumination without deformation, dark with deformation, and illumination with deformation conditions, respectively
EnvironmentRs / Ω·cm2Ceff, 1 / μF·cm-2n1R1 / Ω·cm2Ceff, dl / μF·cm-2ndlRct / Ω·cm2
0% strain, dark4.08117.60.60.243260.92784
0% strain, UV9.1728.10.590.524110.85575.7
6% strain, dark2.83876.70.77229.3136200.81366.9
6% strain, UV3.19853.10.8476.1145010.8773
Table 1  EIS fitting results of 40Cr steel immersed in 3.5%NaCl solution for 120 h under different experimental conditions
Fig.8  M-S plots of 40Cr steel after immersion in 3.5%NaCl solution for 120 h under dark without deformation, illumination without deformation, dark with deformation, and illumination with deformation conditions, respectively (a) and the calculated donor carrier density (b)
Fig.9  photogenerated E-t curves of 0% strain and 6% strain 40Cr steels under chopped illumination
Fig.10  Schematic diagram of corrosion of 40Cr steel under the combined effect of plastic strain and illumination
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