Optical Parameter Measurement and Characteristic Identification for Corrosion Products of Steel Materials Based on Terahertz Time-Domain Spectroscopy

Xuelei Jiang; Enen Li; Ying Xu; Tianwu Wang; Wenyu Xie

doi:10.3788/AOS222047

Acta Optica Sinica, Volume. 43, Issue 11, 1112003(2023)

Optical Parameter Measurement and Characteristic Identification for Corrosion Products of Steel Materials Based on Terahertz Time-Domain Spectroscopy

Xuelei Jiang^1,2, Enen Li^3,4,5,6, Ying Xu^1,2、*, Tianwu Wang^3,4,5,6、**, and Wenyu Xie^1,2

Author Affiliations

¹Shenzhen Key Laboratory of Intelligent Structure System in Civil Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, Guangdong, China

²Shenzhen Key Laboratory of Urban & Civil Engineering Disaster Prevention & Reduction, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, Guangdong, China

³Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

⁴Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China

⁵School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

⁶GBA Branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou 510700, Guangdong, China

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Figures & Tables(8)

Fig. 1. Schematic diagram of the transmission THz in ultra-wideband THz-TDS system

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Fig. 2. THz-TDS signals of different corrosion product samples. (a) Time-domain signals; (b) frequency-domain signals

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$Optical parameters of different samples. (a) Absorbance of corrosion products; (b) refractive index of corrosion products; (c) absorbance of corrosion products crystal; (d) refractive index of corrosion products crystal$

Fig. 3. Optical parameters of different samples. (a) Absorbance of corrosion products; (b) refractive index of corrosion products; (c) absorbance of corrosion products crystal; (d) refractive index of corrosion products crystal

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Fig. 4. XRD results of different corrosion products

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$Broadband THz-TDS determination of corrosion products crystals. (a) THz time-domain signals; (b) refractive indices;(c) identification of characteristic absorption peaks$

Fig. 5. Broadband THz-TDS determination of corrosion products crystals. (a) THz time-domain signals; (b) refractive indices;(c) identification of characteristic absorption peaks

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Fig. 6. Broadband THz-TDS determination of corrosion products. (a) Time-domain signals; (b) identification of characteristic absorption peaks

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Table 1. Preparation of different corrosion product samples

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Table 1. Preparation of different corrosion product samples

Origin
Category	CRB550-Cl	CRB550-S	Q235-Cl	Q235-S	O-S	α-FeOOH	Fe3O4	Fe2O3
Sample
Thickness /mm	1.07	0.97	0.75	0.68	1.0	0.9	0.88	0.68
Category	CRB550-Cl-5%	CRB550-S-5%	Q235-Cl-5%	Q235-S-5%	O-S-5%	α-FeOOH-5%	Fe3O4-5%	Fe2O3-5%
Sample
Thickness /mm	1.73	1.74	1.99	1.83	1.66	1.92	1.64	1.48

Table 2. Relative content of each component in corrosion products samples
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Table 2. Relative content of each component in corrosion products samples
Sample Fe₃O₄（30.0） Fe₂O₃（47.0） α-FeOOH（21.5） β-FeOOH（27.0） γ-FeOOH（14.2）
CRB550-Cl ## ^^ ++ --- ***
CRB-550-S ### ^ ++++ - *
Q235-Cl #### ^^^^^ ++ ----- *****
Q235-S # ^^^^ +++++ ---- ****
O-C ##### ^^^ + -- **

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Xuelei Jiang, Enen Li, Ying Xu, Tianwu Wang, Wenyu Xie. Optical Parameter Measurement and Characteristic Identification for Corrosion Products of Steel Materials Based on Terahertz Time-Domain Spectroscopy[J]. Acta Optica Sinica, 2023, 43(11): 1112003

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