Effect of Laser Rust Removal Process on Corrosion Resistance of EH36 Marine Steel

Zhixin Wang; Zhen Yang; Jianfeng Shangguan; Xusheng Suo; Xinxin Shen; Hu Zhou; Yanqun Tong; Aihua Yuan

doi:10.3788/LOP220916

Laser & Optoelectronics Progress, Volume. 60, Issue 5, 0514011(2023)

Effect of Laser Rust Removal Process on Corrosion Resistance of EH36 Marine Steel

Zhixin Wang¹, Zhen Yang², Jianfeng Shangguan³, Xusheng Suo¹, Xinxin Shen², Hu Zhou¹, Yanqun Tong^3、**, and Aihua Yuan^1、*

Author Affiliations

¹School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, Jiangsu, China

²Shanghai Waigaoqiao Shipbuilding Co., Ltd., Shanghai 200137, China

³School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

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Figures & Tables(15)

Fig. 1. Schematic. (a) Laser system; (b) laser scanning path

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Fig. 2. SEM images. (a) Tr; (b) T1; (c) T2; (d) T3; (e) T4; (f) T5

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Fig. 3. SEM images. (a) T6; (b) T7; (c) T2; (d) T8; (e) T9

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Fig. 4. Surface roughness. (a) T0-T5; (b) T6, T7, T2, T8, and T9

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Fig. 5. XRD pattern of different samples

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Fig. 6. Oxygen contents of different samples

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Fig. 7. Polarization curves of different samples. (a) T1-T5; (b) T6, T7, T2, T8, and T9; (c) T0, Tr, T2, and T3

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Fig. 8. Impedance spectrum test results. (a) Simulated equivalent circuit; impedance spectra of (b) T1-T5 and (c) T6, T7, T2, T8, and T9

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Fig. 9. Bode plots and phase-frequency plots. Bode plots of (a) T1-T5 and (c) T6, T7, T2, T8, and T9; phase-frequency plots of (b) T1-T5 and (d) T6, T7, T2, T8, and T9

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Table 1. Chemical composition of EH36 steel
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Table 1. Chemical composition of EH36 steel
Element C Si Mn P S Cr Ni Cu Mo Ti V Nb Al
Mass fraction /% ≤0.18 ≤0.50 0.90-1.60 ≤0.025 ≤0.025 ≤0.025 ≤0.2 ≤0.4 ≤0.35 ≤0.08 0.05-0.1 0.02-0.05 ≥0.015

Table 2. Sample number
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Table 2. Sample number
Sample Laser density /（J·cm^-2） Laser scan rate /（mm·s^-1）
T1 1.273 3000
T2 2.546 3000
T3 3.820 3000
T4 5.093 3000
T5 6.365 3000
T6 2.546 2000
T7 2.546 2500
T8 2.546 3500
T9 2.546 4000

Table 3. Surface roughness of different samples

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Table 3. Surface roughness of different samples

Sample	Surface roughness in three places /μm			Average surface roughness /μm	Standard deviation /μm
T0	2.872	2.800	3.291	2.980	0.265
T1	2.892	2.994	2.543	2.800	0.236
T2	1.737	1.750	1.754	1.747	0.008
T3	3.546	3.456	3.465	3.489	0.049
T4	5.066	4.897	4.939	4.960	0.087
T5	5.585	5.743	5.089	5.470	0.341
T6	5.333	5.634	5.475	5.480	0.150
T7	5.092	5.033	4.937	5.020	0.078
T8	4.893	5.440	5.398	5.243	0.304
T9	4.813	6.434	5.222	5.489	0.843

Table 4. Oxygen content of different samples

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Table 4. Oxygen content of different samples

Sample	Oxygen content at three sites /%			Average oxygen content /%
T0	0.16	0.18	0.29	0.21
Tr	29.27	29.97	30.03	29.75
T1	3.56	3.88	3.69	3.71
T2	0.43	0.54	0.67	0.54
T3	1.86	1.96	1.42	1.74
T4	3.84	3.93	3.72	3.83
T5	9.77	10.08	9.35	9.73
T6	4.52	4.87	4.19	4.52
T7	1.89	1.67	2.08	1.88
T8	2.22	2.03	2.15	2.13
T9	3.69	3.83	3.90	3.80

Table 5. Parameters of polarization curves for different samples
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Table 5. Parameters of polarization curves for different samples
Sample E_coor /V I_coor /（μA·cm^-2）
Tr -1.180 15.91
T0 -1.110 11.42
T1 -0.931 7.11
T2 -0.402 4.91
T3 -0.411 5.27
T4 -0.776 5.82
T5 -0.447 6.01
T6 -0.979 8.21
T7 -0.396 6.31
T8 -0.776 5.12
T9 -0.894 7.01

Table 6. Impedance spectra parameters of different samples

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Table 6. Impedance spectra parameters of different samples

Sample	R_s /（Ω·cm²）	R_ct /（Ω·cm²）	C /μf
T1	12.24	146.8	5.309
T2	15.66	869.6	13.340
T3	11.27	625.2	53.560
T4	10.76	622.2	8.882
T5	13.36	230.5	2.531
T6	14.07	576.1	78.880
T7	13.04	816.6	11.050
T8	15.88	715.2	28.880
T9	14.66	495.5	12.040

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Zhixin Wang, Zhen Yang, Jianfeng Shangguan, Xusheng Suo, Xinxin Shen, Hu Zhou, Yanqun Tong, Aihua Yuan. Effect of Laser Rust Removal Process on Corrosion Resistance of EH36 Marine Steel[J]. Laser & Optoelectronics Progress, 2023, 60(5): 0514011

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