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Experimental Investigation on Binary Nanocomposite Coatings by Electrodeposition in an Ultrasonic Field

Author: ShenChen
Tutor: XueYuJun
School: Henan University of Science and Technology
Course: Mechanical Design and Theory
Keywords: DC deposition Ultrasonic wave Nanoparticles Nanocomposite Coatings Microstructure Performance
CLC: TG174.4
Type: Master's thesis
Year: 2009
Downloads: 23
Quote: 2
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Abstract


The electrodeposition can be obtained resistance to abrasion, corrosion, high temperature oxidation resistance and catalytic performance nanocomposite coating. Nanocomposite Coatings performance mainly depends on the nanoparticle coating the nature, type, distribution, and electro-deposition process conditions. Usually nanocomposite coating is a nano-particles prepared in the conventional electrodeposition method is added in the bath containing two nanoparticles composite coating is less. In the electrodeposition process of applying ultrasonic waves can be suppressed nanoparticles reunion, refine the grain size of the coating, to help improve the coating performance. Two types of nanoparticles added to the bath, combined with the strengthening effect of ultrasound on the electrodeposition process, is expected to prepared and better performance of nano-composite coatings. This thesis is in the bath a rare earth oxide, yttrium (Y 2 O 3 ) and ceramic zirconia (the ZrO 2 ) two nanoparticles , launched a pilot study of the ultrasonic field electrodeposition Binary Nanocomposite Coatings. Mainly studied the impact of process parameters on the content of the coating nanoparticles coating surface morphology, microstructure, and high temperature oxidation resistance of the coating and the friction and wear properties were tested, and then discusses the two kinds of nanoparticles and ultrasonic the mechanism of action of the coating structure and performance improvement. Completion of the thesis the main contents and conclusions are as follows: First, bath two nanoparticles added amount of cathode current density and ultrasonic parameters on composite coating nanoparticles content, the ultrasonic field electrodeposition the Preparation Ni-Y 2 the O 3 -ZrO is 2 binary nano-composite coatings optimize the process parameters, namely: Y 2 the O 3 nano-particles to add the amount of 10 g / L, the ZrO 2 nano-particles added amount of 20 g / L, cathode current density 2A/dm2 of ultrasonic power 300W, ultrasonic frequency 45kHz stirring speed of 900r/min, the bath temperature of 45 (?) C. Secondly, the two co-deposition of nano-particles of Ni ions polarization curves and electrochemical impedance spectroscopy. The nano-particles added to the plating bath, not only the cathode reduction potential negative shift, and changing the impedance of the electrode reaction, resulting in the electrochemical impedance spectrum of the low frequency region of the two inductive loop. Explore the impact of process parameters on the coating surface morphology and crystal orientation of the different coating. Coarsening of crystal grains of the pure Ni layer, the organization is uneven, a strong diffraction peak appears in the nickel lattice (2 2 0) crystal plane. Nanoparticles and ultrasonic coating matrix metal Ni grain refining effect; nanoparticles weakened the coating growth in the (220) plane, and changing the crystal orientation of the coating; ultrasonic field preparation of Ni-Y 2 O 3 -ZrO 2 binary nano-composite coatings fine grain size, uniform and dense coating in (111), (20 0) and (2 2 0), the direction of balanced growth. Fourth, the comparative study of pure Ni plating, one yuan composite coating and binary composite coating micro-hardness, high temperature anti-oxidation resistance and friction and wear properties. Ultrasonic field fabrication by electrochemical deposition of Ni-Y 2 O 3 -ZrO 2 composite coating has high microhardness, good high temperature oxidation resistance and friction and wear properties. This indicates that under the combined action of the two kinds of nanoparticles and ultrasonic composite coating has excellent overall performance. Fifth, the analysis of binary composite coatings factors and their mechanism of action. In reasonable proportion of the two nanoparticles in the plating bath can promote each other codeposition; ultrasonic and can promote the uniform distribution of these nanoparticles in the coating, so as to refine the crystal grains of the composite coating to improve its performance. In this thesis through research, obtained the of the ultrasonic field preparation of anti-high temperature and wear resistance of Ni-Y 2 O 3-ZrO 2 two $ Nanocomposite Coatings the composite electrodeposition process. In this study, the development of composite coating with excellent performance has a certain reference value.

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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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