材料科学
腐蚀
X射线光电子能谱
箔法
复合数
光电效应
紫外线
复合材料
介电谱
氧化物
工作职能
化学工程
电化学
分析化学(期刊)
冶金
光电子学
化学
图层(电子)
工程类
电极
物理化学
色谱法
作者
Shu-hao Deng,Hao Lu,Dongyang Li
标识
DOI:10.1016/j.apsusc.2018.07.116
摘要
Effects of ultraviolet (UV) light illumination on the corrosion behavior, surface state, and activities of electrodeposited micro-TiO2/Ni and nano-TiO2/Ni composite foils in 3.5% NaCl solution were investigated by means of polarization measurement, electrochemical impedance spectra (EIS), electron work function mapping (EWF) and XPS spectra analysis using an electrochemical system, the atom force microscopy (AFM) and X-ray photoelectric spectroscopy (XPS), respectively. The UV light illumination resulted in a considerable decrease in corrosion resistance of the nano-TiO2/Ni composite foil but showed much less effect on the micro-TiO2/Ni composite foil. Surface state analysis demonstrated that the UV illumination stimulated the nano-TiO2 semiconductor with elevated conductivity in favor of passing corrosion current. The UV illumination increased the fraction of Ni2O3 component in formed oxide film on the nano-TiO2/Ni foil, which is porous, loose, brittle and less protective, compared to the naturally formed NiO film on Ni. The changes in surface state were responsible for variations in the corrosion behavior of micro-TiO2/Ni and nano-TiO2/Ni composite foils caused by the UV light illumination.
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