Effect of Laser Parameters on Corrosion Resistance of Laser Melting Layer on Q235B Steel Surface

Lidong Yu; Tianxuan Bian; Yunteng Qu; Beibei Zhang; Yang Bai

doi:10.3788/CJL220866

Chinese Journal of Lasers, Volume. 50, Issue 8, 0802201(2023)

Effect of Laser Parameters on Corrosion Resistance of Laser Melting Layer on Q235B Steel Surface

Lidong Yu^1,2, Tianxuan Bian^1,2, Yunteng Qu^1,3, Beibei Zhang², and Yang Bai^1,2,3、*

Author Affiliations

¹Institute of Photonics and Photon-Technology, Northwest University, Xi’an 710127, Shaanxi, China

²State Key Laboratory of Photon-Technology in Western China Energy, Xi’an 710127, Shaanxi, China

³Shaanxi Engineering Technology Research Center for Solid State Lasers and Application, Xi’an 710127, Shaanxi, China

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Figures & Tables(17)

Fig. 1. Schematic of laser melting unit, where the inset shows laser beam scanning path and two-dimensional energy distribution

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Fig. 2. Macroscopic and microscopic images of laser melting layer

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Fig. 3. Dynamic potential polarization curves of laser melting layer at different laser single pulse energy densities and spot overlap rates

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Fig. 4. SEM images of laser melting layers with optimal laser single pulse energy density and different spot overlap rates for a single laser scanning. (a) β=70%; (b) β=80%; (c) β=90%

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Fig. 5. Dynamic potential polarization curves of laser melting layer with different laser scanning times (E_opt=3.82 J/cm² and β=80%)

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Fig. 6. SEM images of laser melting layers with different laser scanning times n (E_opt=3.82 J/cm² and β=80%). (a) n=1; (b) n=2;

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Fig. 7. Sectional SEM image of optimal laser melting layer

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Fig. 8. EDS spectra and XRD patterns of tested samples. (a) EDS spectrum of substrate; (b) EDS spectrum of alkaline blackening layer; (c) EDS spectrum of optimal laser melting layer; (d) XRD patterns

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Fig. 9. Electrochemical test of corrosion resistant layers. (a) Dynamic potential polarization curves; (b) Nyquist curves; (c) Bode plots

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Fig. 10. EIS equivalent circuit

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Fig. 11. Microscopic morphologies of two corrosion resistant layers. (a)(d) Thickness of cut surfaces; (b)(e) three-dimensional

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Table 1. Single pulse energy density at different average laser powers
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Table 1. Single pulse energy density at different average laser powers
Average power /W Energy density /（J·cm^-2）
10 1.27
20 2.55
30 3.82
40 5.09
50 6.36

Table 2. Parameters related to kinetic potential polarization curves at different laser single pulse energy densities and spot overlap rates in a single laser scanning

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Table 2. Parameters related to kinetic potential polarization curves at different laser single pulse energy densities and spot overlap rates in a single laser scanning

Spot overlap rate β/%	E /（J·cm^-2）	E_corr /V	I_corr /（A·cm^-2）
70	1.27	-1.240	2.649×10^-5
	2.55	-1.220	2.506×10^-5
	3.82	-1.006	3.069×10^-6
	5.09	-1.122	9.840×10^-6
	6.36	-1.130	9.705×10^-5
80	1.27	-1.224	1.352×10^-5
	2.55	-1.206	9.120×10^-6
	3.82	-0.973	2.449×10^-6
	5.09	-1.095	1.845×10^-5
	6.36	-1.085	1.368×10^-5
90	1.27	-1.189	3.388×10^-5
	2.55	-1.222	5.495×10^-5
	3.82	-0.985	3.707×10^-6
	5.09	-1.098	1.901×10^-5
	6.36	-1.103	1.892×10^-5

Table 3. Parameters related to kinetic potential polarization curves with different laser scanning times (E_opt=3.82 J/cm² and β=80%)
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Table 3. Parameters related to kinetic potential polarization curves with different laser scanning times (E_opt=3.82 J/cm² and β=80%)
The number of laser scanning n E_corr /V I_corr /（A·cm^-2）
1 -0.973 2.449×10^-6
2 -0.948 2.265×10^-6
3 -0.943 1.990×10^-6
4 -0.936 1.644×10^-6
5 -1.017 5.848×10^-6
6 -1.032 7.967×10^-6

Table 4. EDS analysis data at different thicknesses on the section of optimal laser melting layer

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Table 4. EDS analysis data at different thicknesses on the section of optimal laser melting layer

Layer No.	Point No.	Mass fraction /%
Layer No.	Point No.	Fe	O	C
Layer a	a₁	97.61	1.34	1.05
	a₂	97.62	1.26	1.12
	a₃	97.60	1.29	1.11
Layer b	b₁	90.27	8.75	0.98
	b₂	90.20	8.79	1.01
	b₃	90.07	8.91	1.02
Layer c	c₁	83.83	15.24	0.93
	c₂	83.48	15.53	0.99
	c₃	84.03	15.03	0.94
Layer d	d₁	83.25	15.84	0.91
	d₂	82.97	16.09	0.94
	d₃	83.24	15.87	0.89

Table 5. EDS analysis data of samples to be tested
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Table 5. EDS analysis data of samples to be tested
Sample Mass fraction /%
Fe O C
Substrate 97.66 1.24 1.10
Alkaline blackening layer 86.18 12.87 0.95
Laser melting layer 83.87 15.20 0.93

Table 6. Fitting parameter values of EIS equivalent circuit
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Table 6. Fitting parameter values of EIS equivalent circuit
Specimen R₁ /（Ω·cm²） Q₁ /μS m₁ R₂ /（Ω·cm²） Q₂ /μS m₂ R_ct /（Ω·cm²） χ² /10^-3
Alkaline blackening layer 29.2 127 0.8 19 410.2 0.76 520.9 1.21
Laser melting layer 25.1 224 0.9 25 274.2 0.85 1536.7 2.91

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Lidong Yu, Tianxuan Bian, Yunteng Qu, Beibei Zhang, Yang Bai. Effect of Laser Parameters on Corrosion Resistance of Laser Melting Layer on Q235B Steel Surface[J]. Chinese Journal of Lasers, 2023, 50(8): 0802201

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Paper Information

Category: Laser Surface Machining

Received: May. 18, 2022

Accepted: Jul. 12, 2022

Published Online: Dec. 21, 2022

The Author Email: Bai Yang (by@nwu.edu.cn)

DOI:10.3788/CJL220866

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Single pulse energy density at different average laser powers

Table 1. Single pulse energy density at different average laser powers

Table 2. Parameters related to kinetic potential polarization curves at different laser single pulse energy densities and spot overlap rates in a single laser scanning

Table 2. Parameters related to kinetic potential polarization curves at different laser single pulse energy densities and spot overlap rates in a single laser scanning

Table 3. Parameters related to kinetic potential polarization curves with different laser scanning times (Eopt=3.82 J/cm2 and β=80%)

Table 3. Parameters related to kinetic potential polarization curves with different laser scanning times (Eopt=3.82 J/cm2 and β=80%)

Table 4. EDS analysis data at different thicknesses on the section of optimal laser melting layer

Table 4. EDS analysis data at different thicknesses on the section of optimal laser melting layer

Table 5. EDS analysis data of samples to be tested

Table 5. EDS analysis data of samples to be tested

Table 6. Fitting parameter values of EIS equivalent circuit

Table 6. Fitting parameter values of EIS equivalent circuit

Table 3. Parameters related to kinetic potential polarization curves with different laser scanning times (E_opt=3.82 J/cm² and β=80%)

Table 3. Parameters related to kinetic potential polarization curves with different laser scanning times (E_opt=3.82 J/cm² and β=80%)