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Preparation and Performance of NiP/TiO2 Composite Film on Carbon Steel

Author: SunYongAi
Tutor: GaoZhiMing
School: Tianjin University
Course: Materials Science
Keywords: NiP/TiO2 composite membrane Voltammetry Corrosion resistance Photogenerated cathodic protection
CLC: TG174.4
Type: Master's thesis
Year: 2010
Downloads: 43
Quote: 0
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Abstract


The metal surface modification has now become a widely used anti - corrosion technology, and the metal oxide film with its unique chemical stability and good mechanical properties attention . In recent years, the TiO 2 material with its unique light response characteristics , its large-scale applications in air purification and organic wastewater treatment ; TiO to 2 film in solution resistance to chemical corrosion and anti - light corrosion , high temperature oxidation at high temperatures and , therefore more and more to the titanium dioxide thin film is used as anti-corrosion coating . In this paper, anodic electrodeposition method NiP as intermediate layer on the carbon steel surface prepared TiO 2 film . Derived by EDS and XPS system in the the electrodeposition solution in different pH composite membrane surface composition and determine film forming optimum pH value of 2.25 ; linear sweep voltammetry (LSV) and cyclic sweep voltammetry ( CV) study the electrochemical characteristics of the film-forming process , determine formation potential, should stabilize at around 0.3V . The composite membrane SEM results obtained in the optimization of process , NiP / TiO 2 composite film more than NiP coating formation . Titanium oxide powder to be drawn in the film - forming process was subjected to differential thermal analysis ( DTA ) , and draw the crystal transition temperature , determining a heat treatment temperature of 400 ° C. The TiO 2 crystal film . By potentiodynamic scanning electrochemical impedance spectroscopy method to study the composite film in 0.5 mol / L NaCl solution corrosion resistance and failure characteristics , the results show that the NiP / TiO 2 composite films improved the corrosion resistance . Article also combined with optical , electrochemical methods , optical test in our laboratory for the first time , the light absorption results of TiO 2 film in the film - forming process , while achieving a matrix metal on TiO 2 film self- doping, the absorption wavelength range \the role under ultraviolet light can be the metal base body has played photoinduced cathodic protection , to further improve the corrosion resistance of the metal substrate .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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