Study on Preparation and Mechanical Properties of Superhydrophobic Ni/TiO2 Composite Coating on Surface of Stainless Steel

YAO Xin, HU Chuanbo, YIN Huawei, CUI Zheng, LU Dan

doi:10.16577/j.issn.1001-1560.2022.0310

2022 , Vol. 55 >Issue 11: 69 - 77

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0310

Study on Preparation and Mechanical Properties of Superhydrophobic Ni/TiO₂ Composite Coating on Surface of Stainless Steel

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(1. Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404000, China;2. School of Energy and Power Engineering, Xihua University, Chengdu 610039, China;3. Department of Chemistry, Hong Kong Baptist University, Hong Kong 999077, China;4. Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643000, China)

Received date: 2022-05-16

Revised date: 2022-06-21

Accepted date: 2022-07-20

Online published: 2023-12-25

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Abstract

In order to improve the antifouling and corrosion resistance of stainless steel, a superhydrophobic Ni/TiO2 composite coating was successfully prepared on the surface of stainless steel by one - step electrodeposition technology and fluorination modification technology. The effect of current density on the surface morphology of Ni coating was investigated, and a Ni coating with a rough petal - like structure was fabricated when the current density was 9 A/dm2. Subsequently, a co - deposition method was adopted to acquire Ni/TiO2 composite coating on the surface of stainless steel using such constant current density, and then the acquired coating was treated with fluorination modification to form a superhydrophobic composite coating. Moreover, the surface morphology, chemical composition and crystal structure of the prepared coating were studied through field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS) and X - ray diffraction (XRD). The contact angle test results showed that the modified Ni/TiO2 composite coating possessed superhydrophobic property with a contact angle of 159.2° and a sliding angle of 6.3°. The results of tape peeling test and abrasion test showed that the superhydrophobic composite coating had superior mechanical stability. Compared with bare stainless steel, the self - corrosion current density of the superhydrophobic composite coating decreased by two orders of magnitude, and the corrosion inhibition efficiency reached 98.4 %, exhibiting excellent corrosion resistance. Meantime, the superhydrophobic Ni/TiO2 composite coating also possessed good self - cleaning performance and could provide an effective protection for the substrate.

Key words： electrodeposition; fluorination modification; Ni/TiO2 composite coating; superhydrophobic; mechanical stability

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YAO Xin, HU Chuanbo, YIN Huawei, CUI Zheng, LU Dan . Study on Preparation and Mechanical Properties of Superhydrophobic Ni/TiO₂ Composite Coating on Surface of Stainless Steel[J]. Materials Protection, 2022 , 55(11) : 69 -77 . DOI: 10.16577/j.issn.1001-1560.2022.0310

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