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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (5): 1417-1424    DOI: 10.11902/1005.4537.2024.398
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Impact of Nanosecond Pulsed Laser Irradiation on Electrochemical Corrosion Behavior of 17-4PH Stainless Steel
LI Ping1, SHI Huijie1, PEI Jibin2, WANG Zijian1, CAO Tieshan1, CHENG Congqian1(), ZHAO Jie1
1 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2 School of Railway Locomotive and Vehicle, Jilin Railway Technology College, Jilin 132299, China
Cite this article: 

LI Ping, SHI Huijie, PEI Jibin, WANG Zijian, CAO Tieshan, CHENG Congqian, ZHAO Jie. Impact of Nanosecond Pulsed Laser Irradiation on Electrochemical Corrosion Behavior of 17-4PH Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1417-1424.

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Abstract  

The impact of nanosecond laser irradiation on the electrochemical corrosion resistance of 17-4PH stainless steel in 3%NaCl solution was investigated by means of electrochemical impedance analysis, surface corrosion morphology observation, and passivation film valence state testing. The results show that the steel after being subjected to laser irradiation with optimal processing parameters presents pitting potential and impedance higher than those after being passivated in 30%HNO3 solution i.e. conventional passivation. Among others, the concentration of point defects in the passivation film of the former was the lowest. while its Cr/Fe ratio was the highest. These phenomena may be attributed to that the nanosecond laser irradiation can promote the preferential oxidation of Cr to form chromium oxide through instantaneous high-temperature oxidation, while reducing surface defects and roughness, optimizing the passivation film structure, and significantly improving the pitting resistance of stainless steel, so that effectively improving the corrosion resistance of stainless steel.

Key words:  17-4PH stainless steel      nanosecond pulse laser      orthogonal experiment      electrochemical testing      corrosion resistance     
Received:  19 December 2024      32134.14.1005.4537.2024.398
ZTFLH:  TG178  
Fund: Key Laboratory Project on Reliability Technology for Aerospace Launch Site(SYS-2022-12-02)
Corresponding Authors:  CHENG Congqian, E-mail: cqcheng@dlut.edu.cn

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2024.398     OR     https://www.jcscp.org/EN/Y2025/V45/I5/1417

LevelA (power / W)B (pulse width / ns)C (overlap rate / %)
11203065
213012070
314024075
Table 1  L9 (33) orthogonal test parameters of nanosecond pulsed laser irradiation
Experimental numberA (power / W)B (pulse width / ns)C (overlap rate / %)Pitting potential, E / V
L112030650.232
L2120120700.394
L3120240750.341
L413030750.271
L5130120700.345
L6130240650.321
L714030700.318
L8140120650.247
L9140240750.255
k1 (E)0.3220.2740.267
k2 (E)0.3120.3290.352
k3 (E)0.2730.3060.289
R (E)0.0490.0550.086
Factor rankingR(E): C > B > A
Optimal solutionPitting potential: A1B2C2
Table 2  Orthogonal test results and range analysis
Fig.1  Variations of the average pitting potential with different factors and levels
Fig.2  Potentiodynamic polarization curves of 17-4PH stainless steel samples with different surface treatments
Fig.3  Surface morphologies of surface pre-treated 17-4PH stainless steel samples before and after polarization test in 3.5%NaCl solution: (a, b) grinding, (c, d) chemical passivation, (e, f) L1, (g, h) L2
Fig.4  Nyquist (a) and Bode (b) plots of surface pre-treated 17-4PH stainless steel samples in 3.5%NaCl solution, the inset in Fig.4a shows corresponding equivalent circuit model
SamplesRs / Ω·cm2CPE1 / μΩ-1·cm-2·s nnRp / 105 Ω·cm2
Grinding5.22.30.907.6
Chemical passivation4.01.50.9223.2
L16.02.10.826.6
L26.40.90.9347.8
L66.42.20.8417.8
Table 3  Fitting results of EIS of surface pre-treated 17-4PH stainless steel samples in 3.5%NaCl solution
Fig.5  Mott-Schottky curves of surface pre-treated 17-4PH stainless steel samples in 3.5%NaCl solution
SampleGrindingChemical passivationL 1L 2L 6
ND / 1021 cm-31.5050.6960.8230.4100.585
NA / 1021 cm-31.1670.6130.7490.3850.528
Table 4  Doping concentrations of passivation films formed on surface pre-treated 17-4PH stainless steel in 3.5%NaCl solution
Fig.6  XPS fine spectra of Fe 2p 3/2 (a) and Cr 2p 3/2 (b) of passivation films on 17-4PH stainless steel with different surface treatments
Relative atomic concentrationGrindingChemical passivationOptimal laser passive
{[Crox]+[Crhyd]}/{[Crox]+[Crhyd]+[Crmet]}0.8550.8360.898
{[Feox]+[Fehyd]}/{[Feox]+[Fehyd]+[Femet]}0.9200.6730.777
{[Crox]+[Crhyd]}/{[Feox]+[Fehyd]}0.1741.1245.972
Table 5  XPS determined relative atomic concentrations of the passivation films of 17-4PH stainless steel with different surface treatments
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