scholarly journals The mechanism of cathodic electrodeposition of epoxy coatings and the corrosion behaviour of the electrodeposited coatings

2002 ◽  
Vol 67 (5) ◽  
pp. 305-324 ◽  
Author(s):  
Vesna Miskovic-Stankovic
Keyword(s):  
Film Thickness ◽  
Applied Voltage ◽  
Bath Temperature ◽  
Film Deposition ◽  
Organic Film ◽  
Epoxy Coatings ◽  
Protective Properties ◽  
Electrodeposition Process ◽  
Cathodic Electrodeposition ◽  
Electrodeposited Coatings

The model of organic film growth on a cathode during electrodeposition process proposes the current density-time and film thickness-time relationships and enables the evaluation of the rate contents for the electrochemical reaction of OH? ion evolution and for the chemical reaction of organic film deposition. The dependencies of film thickness and rate constants on the applied voltage, bath temperature and resin concentration in the electrodeposition bath have also been obtained. The deposition parameters have a great effect on the cathodic electrodeposition process and on the protective properties of the obtained electrodeposited coatings. From the time dependencies of the pore resistance, coating capacitance and relative permittivity, obtained from impedance measurements, the effect of applied voltage, bath temperature and resin concentration on the protective properties of electrodeposited coatings has been shown. Using electrochemical impedance spectroscopy, thermogravimetric analysis gravimetric liquid sorption experiments, differential scanning calorimetry and optical miscroscopy, the corrosion stability of epoxy coatings was investigated. A mechanism for the penetration of electrolyte through an organic coating has been suggested and the shape and dimensions of the conducting macropores have been determined. It was shown that conduction through a coating depends only on the conduction through the macropores although the quantity of electrolyte in the micropores of the polymer net is about one order of magnitude greater than that inside the conducting macropores.

The effect of applied voltage on the cathodic electrodeposition process

1986 ◽  
Vol 27 (1) ◽  
pp. 89-94 ◽  
Author(s):  
M.D. Maksimović ◽  
V.B. Mišković-Stanković ◽  
N.V. Krstajić
Keyword(s):  
Applied Voltage ◽  
Electrodeposition Process ◽  
Cathodic Electrodeposition

Electrodeposition of CuI Thin Film for Perovskite Solar Cells

2020 ◽  
Vol 979 ◽  
pp. 180-184
Author(s):  
I. Karuppusamy ◽  
K. Ramachandran ◽  
S. Karuppuchamy
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Solar Cells ◽  
Applied Voltage ◽  
Perovskite Solar Cells ◽  
Face Centered Cubic ◽  
Applied Potential ◽  
Cathodic Electrodeposition ◽  
Cubic Structure ◽  
Face Centered

The CuI thin film has been successfully prepared by using cathodic electrodeposition method. The synthesized film was characterized using advanced techniques such as XRD, SEM-EDX and UV measurements. The films are crystallized in face centered cubic structure. The crystallinity is increasing for the applied potential of-0.3 V and the crystallinity deteriorates on increasing the potential above - 0.3 V. It was also observed that the applied voltage plays an important role. Homogeneously distributed triangular faceted morphology was observed from SEM. This is consistent with the result of XRD that electrodeposited CuI thin films grow preferential orientation along the (111) crystal plane.

Determination of the protective properties of electrodeposited organic epoxy coatings on aluminium and modified aluminium surfaces

2005 ◽  
Vol 47 (3) ◽  
pp. 823-834 ◽  
Author(s):  
Z.Ž. Lazarević ◽  
V.B. Mišković-Stanković ◽  
Z. Kačarević-Popović ◽  
D.M. Dražić
Keyword(s):  
Epoxy Coatings ◽  
Protective Properties

The Effect of Surface Wettability on Viscous Film Deposition

2009 ◽  
Author(s):  
Alexandru Herescu ◽  
Jeffrey S. Allen
Keyword(s):  
Contact Angle ◽  
Film Thickness ◽  
Capillary Number ◽  
High Speed ◽  
Glass Tube ◽  
Contact Angles ◽  
Film Deposition ◽  
Surface Wettability ◽  
Working Fluid ◽  
Uniqueness Of The Solution

The viscous deposition of a liquid film on the inside of a capillary has been experimentally investigated with a focus on the relationship between the film thickness and surface wettability. With distilled water as a working fluid tests were run in a 622 microns diameter glass tube with contact angles of 30° and 105°, respectively. In the first set of experiments the tube was uncoated while in the second set a fluoropolymer coating was applied to increase the contact angle. A film thickness dependence with the contact angle θ (surface wettability) as well as the Capillary number in the form hR ∼ Ca2/3/cosθ is inferred from scaling arguments. For partial wetting it may explain the existence of a thicker film for nonzero contact angle. It was further found that the non-wetting case of 105° contact angle deviates significantly from the existing theories, the film thickness presenting a weak dependence with the Capillary number. This deviation as well as the apparent non-uniqueness of the solution is thought to be caused by the film instability (rupture) observed during the tests. The thickness of the deposited film as a function of the Capillary number was estimated from the liquid mass exiting the capillary and the gas-liquid interface (meniscus) velocity, and compared to Bretherton’s data and a correlation proposed by Quere. The film thickness measurements as well as the meniscus velocity were determined with the aid of a Photron high speed camera with 10000 frames per second sampling capability coupled with a Nikon TE-2000 inverted microscope and a Precisa electronic balance.

scholarly journals Electrodeposited Biocoatings, Their Properties and Fabrication Technologies: A Review

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 782
Author(s):  
Andrzej Zielinski ◽  
Michal Bartmanski
Keyword(s):  
Electrophoretic Deposition ◽  
Calcium Ions ◽  
Electrolyte Composition ◽  
Cathodic Deposition ◽  
Properties Of Coatings ◽  
Cathodic Electrodeposition ◽  
Advantages And Disadvantages ◽  
Electrodeposited Coatings ◽  
Recent Developments ◽  
State Of Art

Coatings deposited under an electric field are applied for the surface modification of biomaterials. This review is aimed to characterize the state-of-art in this area with an emphasis on the advantages and disadvantages of used methods, process determinants, and properties of coatings. Over 170 articles, published mainly during the last ten years, were chosen, and reviewed as the most representative. The most recent developments of metallic, ceramic, polymer, and composite electrodeposited coatings are described focusing on their microstructure and properties. The direct cathodic electrodeposition, pulse cathodic deposition, electrophoretic deposition, plasma electrochemical oxidation in electrolytes rich in phosphates and calcium ions, electro-spark, and electro-discharge methods are characterized. The effects of electrolyte composition, potential and current, pH, and temperature are discussed. The review demonstrates that the most popular are direct and pulse cathodic electrodeposition and electrophoretic deposition. The research is mainly aimed to introduce new coatings rather than to investigate the effects of process parameters on the properties of deposits. So far tests aim to enhance bioactivity, mechanical strength and adhesion, antibacterial efficiency, and to a lesser extent the corrosion resistance.

scholarly journals Effect of the Thickness of Insulator Polymeric Films on the Memory Behavior: The Case of the Polymethylmethacrylate and the Polystyrene

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
J. A. Avila-Niño ◽  
A. O. Sustaita ◽  
M. Reyes-Reyes ◽  
R. López-Sandoval
Keyword(s):  
Film Thickness ◽  
Differential Resistance ◽  
Polymeric Films ◽  
Thickness Variation ◽  
Pmma Film ◽  
Organic Layer ◽  
Organic Film ◽  
Aluminum Particles ◽  
Conductivity Switching ◽  
Type Of Behavior

The effect of thickness variation on the memory behavior of the polymethylmethacrylate-(PMMA)-based devices has been investigated. The PMMA film thicknesses have been varied between 5 to 300 nm, and we have found that the film thickness determines the type of behavior: ohmic, write-once-read-many-times (WORM) memory with two ON states, WORM memory with a negative differential resistance (NDR) region, and WORM memory without NDR region. The fact that similar results were obtained using different solvents to dilute PMMA (chlorobenzene, chloroform, and dimethyl sulfoxide), as well as using an other insulating polymer such as polystyrene (PS), leads to the conclusion that the phenomenon of memory depends on the aluminum electrodes, organic film thickness, and the compliance current used during the electroformation whereas the type of organic layer (PMMA or PS) has minor influence. From here, we conclude that the conductivity switching of the insulator organic film is due to the injection of aluminum particles into the film during the first voltage cycle.

Surfacial Metallization of Carbon Fibers by Copper Coating and Field Emission Properties

2010 ◽  
Vol 663-665 ◽  
pp. 183-186 ◽  
Author(s):  
Lan Yang ◽  
Yun Ye ◽  
Tai Liang Guo ◽  
Xiao Jin Huang
Keyword(s):  
Thin Film ◽  
Film Thickness ◽  
Field Emission ◽  
Carbon Fibers ◽  
Applied Voltage ◽  
Volume Resistivity ◽  
Copper Coating ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Metal Thickness

Carbon fibers (CNFs) were surfacial metallized by electroless deposited with copper, and their field emission properties were investigated by diode test. The results indicated that the field emission properties of CNFs were affected by the thicknesses of copper. After CNFs were surfacial metallized, the volume resistivity of CNFs was decreased and field emission property was increased, respectively; increase the thin-film thickness, there appeared an optimal film thickness value for properties of field electron emission. It was found that CNFs owned the best field emission properties after electroless depositing for 15 min, with copper metal thickness as 2.1 µm and the volume resistivity down to 2.3510-4 Ω•cm. The field emission tests showed when applied voltage was 562 V, CNFs appeared bright dots, and the high luminance achieved 1388 cd/m2 under applied voltage 1013 V. Further more theoretical analyses, copper coating on CNFs surface is attributed to good electric conductivity, the low work function and the lower attenuation of electron scattering in thin-film.

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