Anticorrosion Behaviours of the TiO2 / WO3 Composite Photoelectrodes for 304 Stainless Steel

Li, Hong Yi; Ling, Yun Han; Jiang, Bo; Jiang, Wu Feng; Guo, Zhi Hong; Bai, Xin De

doi:10.4028/www.scientific.net/KEM.336-338.2203

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Home Key Engineering Materials High-Performance Ceramics IVAnticorrosion Behaviours of the TiO2 / WO3...

Anticorrosion Behaviours of the TiO₂ / WO₃ Composite Photoelectrodes for 304 Stainless Steel

Abstract:

TiO2 is one kind of semiconductor-based photocatalyst. TiO2 shows relatively high reactivity and chemical stability under ultraviolet (UV) light. However TiO2 is a poor absorber of photons in visible light. In order to improve the absorption efficiency, the coatings of TiO2/WO3, WO3 and TiO2 on ITO were prepared by liquid phase deposition (LPD) and dip coating method, their microstructure, surface properties, photoelectrochemical properties are investigated in this paper. XRD results showed that the phases on the composite coatings are mainly anatase, rutile and WO3 respectively, the SEM results showed that the coatings of TiO2 and TiO2/WO3 are distributed evenly on the materials surface. The electrochemical experiment results showed that open circuit potential of TiO2 and TiO2/WO3 with presence of the UV light illumination were about -343 mV and –650 mV respectively, comparatively the rest potential of 304 stainless steel is about 48 mV, which means that the TiO2 or TiO2/WO3 coatings can protect 304 stainless steel from corrosion, and TiO2/WO3 coatings retained for a while anticorrosion even absence of UV light.

Info:

Periodical:

Key Engineering Materials (Volumes 336-338)

Main Theme:

High-Performance Ceramics IV

Edited by:

Wei Pan and Jianghong Gong

Pages:

2203-2206

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.336-338.2203

Citation:

H. Y. Li et al., "Anticorrosion Behaviours of the TiO₂ / WO₃ Composite Photoelectrodes for 304 Stainless Steel", Key Engineering Materials, Vols. 336-338, pp. 2203-2206, 2007

Online since:

April 2007

Authors:

Hong Yi Li, Yun Han Ling, Bo Jiang, Wu Feng Jiang, Zhi Hong Guo, Xin De Bai

Keywords:

Anti-Corrosion, Polarization Curve, TiO₂/WO₃ Composite Photoelectrodes

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Paper TitlePages

Electrodeposited Ni/Al₂O₃ Composite Coating on NdFeB Permanent Magnets

Authors: Hui Zhang, Yong Wei Song, Zhen Lun Song

Abstract: NdFeB permanent magnets are highly susceptible to corrosion in various environments. A new composite coating electrodeposited on NdFeB magnets was investigated in this paper. The Ni matrix film was firstly electrodeposited on NdFeB surface from watts nickel electrolyte, and then Ni/Al2O3 composite coating was successively electrodeposited on the Ni film. The microstructures of electrodeposited Ni coating and Ni/Al2O3 composite coating were observed by scanning electron microscopy (SEM). The corrosion behavior of Ni coating and Ni/Al2O3 composite coating in 3.5wt% NaC1 solution was studied by polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that the Ni coating and Ni/Al2O3 composite coating could both provide adequate protection to NdFeB substrate. But the free corrosion potential of Ni/Al2O3 composite coating was more positive and the passivation region was more obvious when compared with Ni coating. Meantime, the capacitance loop diameter of Ni/Al2O3 composite coating was significantly larger than that of Ni coating ,which suggested that the anticorrosion resistance of Ni/Al2O3 composite coating was better than electroplated Ni coating.

232

Polyaniline/Fluorocarbon Composite Emulsion Coatings for Anticorrosion to Mild Steel

Authors: Yu Feng Li, Zhao Po Zeng, Di Wang, Xi Ge Wu, Liang Sheng Qiang

Abstract: Water-based Polyaniline(PANI) emulsion and Fluorocarbon(FC) emulsion were synthesized by emulsion polymerization method. The doped polyanline were characterized by Transmission electron microscope(TEM) and X-ray diffraction(XRD). The results showed the PANI has bar-like shape and local crystallinity. The composite anticorrosion coatings of PANI emulsion and FC emulsion were prepared by mixture in aqueous medium and used for corrosion protection of mild steel. The corrosion protection property of PANI/FC coatings on mild steel was investigated by electrochemical impedance spectroscopy(EIS) and open circuit potential(OCP) technique in 3.5wt%NaCl aqueous solution. The results indicated that the water-based PANI/FC coatings could offer high protection because the impedance values and corrosion potential remained at higher. Scanning electron microscope(SEM) showed that the oxidation film formed on the metal surface and prevent corrosion effectively due to the passive effect of PANI pigment. The anticorrosion coatings are environmental friendly because of water dispersion medium.

323

Enhanced Anticorrosion Properties of SnO₂ Coatings in Simulated PEMFC Environments by Hydrothermal Treatment

Authors: Hong Yun, Zhi Guo Zhang, Qun Jie Xu, Chen Ying Tan

Abstract: SnO₂ coatings were supplied on the surface of 304 stainless steel (304SS) by a sol-gel process followed by hydrothermal treatments at different reaction temperature and time, respectively. The effects of hydrothermal temperature and time in pure water on the anticorrosion performances of the SnO₂ films in simulated proton exchange membrane fuel cells (PEMFC) environments were investigated by potentiodynamic polarization curves, open circuit potential-time curves and electrochemical impedance spectroscopy (EIS). It was found that the SnO₂ coated 304SS via the hydrothermal treatment showed a better corrosion resistance than the sample without hydrothermal treatment and bare 304SS. The SnO₂ coated 304SS hydrothermally treated at 160°C for 3h showed the highest corrosion resistance among the samples. The results have been discussed in terms of surface structure of SnO₂ film and its anticorrosion performance in simulated PEMFC environments.

793

Effect of N₂H₄ on Electrodeposition of Ni-Graphene Composite Coatings and their Corrosion Resistance Property

Authors: Quan Yao Yu, Ying Xin Zhang, Zhen Zhen Liu, Zhi Xiang Zeng, Xue Dong Wu, Qun Ji Xue

Abstract: The Ni-graphene composite coatings were prepared by electrochemical deposition method, using nickel sulfate and graphene as primary reagents. Pure Ni coatings, Ni-graphene coatings with N₂H₄ and Ni-graphene coatings without N₂H₄ were prepared from three different but similar electrolytes. The N₂H₄ added into the solution is for complexation with NiSO₄ to settle the Ni ions. Graphene used in this work is characterized by TEM and HRTEM. The reaction of N₂H₄ with NiSO₄ is characterized by XRD and optical graphs. The composite coatings’ morphology, structure and corrosion resistance were characterized by SEM and Potentiodynamic polarization test, respectively. The results show that well dispersed graphene–nickel coatings can be prepared with N₂H₄ in the electrolyte. By comparison with the situation that electrolyte without N₂H₄, graphene agglomerated at the surface of nickel coatings. The grain of the coatings prepared with and without N₂H₄ shows similar sizes. Ni-graphene coatings exhibit poor anticorrosion property by comparison with pure Ni coatings because of the defects (cracks and roughness on composite coatings with and without N₂H₄ in the solution, respectively) on the surface of graphene nickel coatings. These results provide a basis viewpoint for the further research of graphene-metallic composite coatings’ anticorrosion effect.

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