Research on the Preparation of CZTS/α-Fe2O3 Nanocrystalline Composite Film and Their Photo-Cathodic Protection Performance for Q235 Carbon Steel

LI Bo, DENG Hongda, GOU Xiantao, YU Haojie

doi:10.16577/j.issn.1001-1560.2025.0023

2025 , Vol. 58 >Issue 2: 56 - 65

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0023

Research on the Preparation of CZTS/α-Fe₂O₃ Nanocrystalline Composite Film and Their Photo-Cathodic Protection Performance for Q235 Carbon Steel

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(School of Metallurgy and Materials Engineering， Chongqing University of Science and Technology， Chongqing 401331， China)

DENG Hongda(1977-)， Assosiate Professor， Ph.D.，Research Focus: Application of Semiconductor Oxide Film，Corroson and Pretection in Oil and Gas， E-mail: hongdad＠cqust.edu.cn

Received date: 2024-05-27

Revised date: 2024-06-21

Accepted date: 2024-06-25

Online published: 2025-03-20

Supported by

Natural Science Foundation Project of CQ(CSTB2024NSCQ-MSX1184)； Chongqing University of Science and Technology Graduate Science and Technology Innovation Program(YKJCX2420204)

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Abstract

In order to improve the photo-cathodic protection performance of single α-Fe2O3 film， CZTS/α-Fe2O3 nanocrystalline composite film was prepared on the surface of carbon steel by anodic oxidation and sol-gel methods.Scanning electron microscopy (SEM)， X-ray diffraction (XRD) and ultraviolet visible diffuse reflectance spectroscopy (UV-Vis DRS) were employed to analyze the morphology， composition and optical absorption characteristics of the film.Additionally， the photoelectric transport properties of the film were also investigated by electrochemical impedance spectroscopy (EIS)，Mott-Schottky plots，polarization curves，and photocurrent generated through coupling the film electrode with naked carbon steel.Results showed that the composite film had better light absorption range than α-Fe2O3 film.Under light conditions， the composite film exhibited higher carrier concentration， photocurrent， and film impedance than those in the dark.Furthermore， the nanocrystal composite film exhibited higher photoelectrochemical reactivity than the single α-Fe2O3 film.The composite film provided significant protection against corrosion of carbon steel， according to the corrosion potential of the carbon steel moving more negatively over 336 mV.The nanocrystalline composite film also improved photo-cathodic protection performance due to the P-N heterojunctions， with a higher positive photocurrent under light conditions than in the dark.

Key words： photo-cathodic protection; α-Fe₂O₃; CZTS; P-N heterojunction; Q235

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LI Bo, DENG Hongda, GOU Xiantao, YU Haojie . Research on the Preparation of CZTS/α-Fe₂O₃ Nanocrystalline Composite Film and Their Photo-Cathodic Protection Performance for Q235 Carbon Steel[J]. Materials Protection, 2025 , 58(2) : 56 -65 . DOI: 10.16577/j.issn.1001-1560.2025.0023

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