scholarly journals Effects of Surface Pretreatment of Titanium Substrates on Properties of Electrophoretically Deposited Biopolymer Chitosan/Eudragit E 100 Coatings

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1120
Author(s):  
Łukasz Pawłowski ◽  
Michał Bartmański ◽  
Aleksandra Mielewczyk-Gryń ◽  
Andrzej Zieliński
Keyword(s):  
Corrosion Resistance ◽  
Process Parameters ◽  
Electrophoretic Deposition ◽  
Titanium Substrate ◽  
Properties Of Coatings ◽  
Surface Pretreatment ◽  
Coating Application ◽  
Eudragit E ◽  
Deposition Voltage ◽  
Titanium Substrates

The preparation of the metal surface before coating application is fundamental in determining the properties of the coatings, particularly the roughness, adhesion, and corrosion resistance. In this work, chitosan/Eudragit E 100 (chit/EE100) were fabricated by electrophoretic deposition (EPD) and both their microstructure and properties were investigated. The present research is aimed at characterizing the effects of the surface pretreatment of titanium substrate, applied deposition voltage, and time on physical, mechanical, and electrochemical properties of coatings. The coating’s microstructure, topography, thickness, wettability, adhesion, and corrosion behavior were examined. The applied process parameters influenced the morphology of the coatings, which affected their properties. Coatings with the best properties, i.e., uniformity, proper thickness and roughness, hydrophilicity, highest adhesion to the substrate, and corrosion resistance, were obtained after deposition of chit/EE100 coating on nanotubular oxide layers produced by previous electrochemical oxidation.

scholarly journals Electrophoretic Deposition and Characterization of Chitosan/Eudragit E 100 Coatings on Titanium Substrate

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 607 ◽  
Author(s):  
Łukasz Pawłowski ◽  
Michał Bartmański ◽  
Gabriel Strugała ◽  
Aleksandra Mielewczyk-Gryń ◽  
Magdalena Jażdżewska ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Degradation Rate ◽  
Artificial Saliva ◽  
Titanium Substrate ◽  
High Sensitivity ◽  
Titanium Implants ◽  
The Body ◽  
Chitosan Coating ◽  
Eudragit E ◽  
Titanium Grade

Currently, a significant problem is the production of coatings for titanium implants, which will be characterized by mechanical properties comparable to those of a human bone, high corrosion resistance, and low degradation rate in the body fluids. This paper aims to describe the properties of novel chitosan/Eudragit E 100 (chit/EE100) coatings deposited on titanium grade 2 substrate by the electrophoretic technique (EPD). The deposition was carried out for different parameters like the content of EE100, time of deposition, and applied voltage. The microstructure, surface roughness, chemical and phase composition, wettability, mechanical and electrochemical properties, and degradation rate at different pH were examined in comparison to chitosan coating without the addition of Eudragit E 100. The applied deposition parameters significantly influenced the morphology of the coatings. The chit/EE100 coating with the highest homogeneity was obtained for Eudragit content of 0.25 g, at 10 V, and for 1 min. Young’s modulus of this sample (24.77 ± 5.50 GPa) was most comparable to that of human cortical bone. The introduction of Eudragit E 100 into chitosan coatings significantly reduced their degradation rate in artificial saliva at neutral pH while maintaining high sensitivity to pH changes. The chit/EE100 coatings showed a slightly lower corrosion resistance compared to the chitosan coating, however, significantly exceeding the substrate corrosion resistance. All prepared coatings were characterized by hydrophilicity.

Formation of Coatings on Titanium Substrates Obtained from Mixtures of Tungsten and Cobalt Salts Using Shaped-Charge Explosion

2014 ◽  
Vol 1040 ◽  
pp. 43-46 ◽  
Author(s):  
Yu.V. Li ◽  
Sergey Kulkov ◽  
Alexander A. Kozulin ◽  
Sergey A. Kinelovskii ◽  
Sergey N. Kulkov
Keyword(s):  
Mechanical Properties ◽  
Titanium Substrate ◽  
Fluorescence Analysis ◽  
Shaped Charge ◽  
Properties Of Coatings ◽  
X Ray ◽  
Complex Salts ◽  
Substrate Surfaces ◽  
The Relationship ◽  
Titanium Substrates

In this paper the coatings on the titanium substrate surfaces obtained by the shaped-charge synthesis have been investigated. The shaped-charge synthesis was carried out using mixtures with specially synthesized complex salts containing W and Co. The studies included X-ray analysis, X-ray fluorescence analysis, and the measurements of coating microhardness. The relationship between mechanical properties of coatings and their phase and structural state has been determined.

scholarly journals Improving the microstructure and mechanical properties of laser cladded Ni-based alloy coatings by changing their composition: A review

2020 ◽  
Vol 59 (1) ◽  
pp. 340-351
Author(s):  
Lin Yinghua ◽  
Ping Xuelong ◽  
Kuang Jiacai ◽  
Deng Yingjun
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Rare Earth ◽  
Composite Coatings ◽  
Single Element ◽  
Properties Of Coatings ◽  
Hard Particles ◽  
Microstructure And Mechanical Properties ◽  
Nickel Based Alloy

AbstractNi-based alloy coatings prepared by laser cladding has high bonding strength, excellent wear resistance and corrosion resistance. The mechanical properties of coatings can be further improved by changing the composition of alloy powders. This paper reviewed the improved microstructure and mechanical properties of Ni-based composite coatings by hard particles, single element and rare earth elements. The problems that need to be solved for the particle-reinforced nickel-based alloy coatings are pointed out. The prospects of the research are also discussed.

scholarly journals Chemical Composition and Corrosion Behavior of a-C:H/DLC Film-Coated Titanium Substrate in Simulated PEMFC Environment

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 820
Author(s):  
Beibei Han ◽  
Mengyuan Yan ◽  
Dongying Ju ◽  
Maorong Chai ◽  
Susumu Sato
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Metal Ion ◽  
Ion Beam ◽  
Titanium Substrate ◽  
Corrosion Current ◽  
Ion Concentration ◽  
Bipolar Plates ◽  
High Adhesion ◽  
Corrosion Behaviors

The amorphous hydrogenated (a-C:H) film-coated titanium, using different CH4/H2 and deposition times, was prepared by the ion beam deposition (IBD) method, which has the advantage of high adhesion because of the graded interface mixes at the atomic level. The chemical characterizations and corrosion behaviors of a-C:H film were investigated and evaluated by SEM, AFM, Raman spectroscopy, EPMA, TEM and XPS. An a-C:H film-coated titanium was corroded at 0.8 V, 90 °C in a 0.5 mol/L H2SO4 solution for 168 h. The metal ion concentration in the H2SO4 corrosion solution and the potentiodynamic polarization behavior were evaluated. Results indicate that a higher CH4/H2 of 1:0 and a deposition time of 12 h can result in a minimum ID/IG ratio of 0.827, Ra of 5.76 nm, metal ion concentration of 0.34 ppm in the corrosion solution and a corrosion current of 0.23 µA/cm2. The current density in this work meets the DOE’s 2020 target of 1 µA/cm2. Electrical conductivity is inversely proportional to the corrosion resistance. The significant improvement in the corrosion resistance of the a-C:H film was mainly attributed to the increased sp3 element and nanocrystalline TiC phase in the penetration layer. As a result, the a-C:H film-coated titanium at CH4/H2 = 1:0 with improved anti-corrosion behavior creates a great potential for PEMFC bipolar plates.

Preparation of Hydroxyapatite/Chitosan Biological Coatings on Carbon/Carbon Composites

2010 ◽  
Vol 434-435 ◽  
pp. 502-505
Author(s):  
Ying Hua Li ◽  
Li Yun Cao ◽  
Jian Feng Huang ◽  
Xie Rong Zeng
Keyword(s):  
Heat Treatment ◽  
Electrophoretic Deposition ◽  
Isopropyl Alcohol ◽  
Raw Materials ◽  
Composite Coatings ◽  
Thermal Conditions ◽  
Hydrothermal Condition ◽  
Subsequent Heat Treatment ◽  
Carbon Composites ◽  
Deposition Voltage

Hydroxyapatite/Chitosan (HAp/CS) bio-coatings were prepared on the surface of carbon/ carbon (C/C) composites by hydrothermal electrophoretic deposition, using sonochemical process resulted HAp nanoparticles, isopropyl alcohol and chitosan as raw materials. The influences of hydro- thermal conditions and deposition voltage on the microstructures and morphologies of the as-prepared coatings were investigated. It was shown that homogenous and dense HAp/CS coatings on C/C composites are obtained by hydrothermal electrophoretic deposition. With the increase of deposition voltage, density and homogeneity of the as-prepared HAp/CS composite coatings are well improved. Due to the growth of HAp nanoparticles in the hydrothermal condition, the subsequent heat treatment of the HAp/CS coatings is not needed.

scholarly journals Enhancement of Life Time of the Dimensionally Stable Anode for Copper Electroplating Applications

2017 ◽  
Vol 62 (2) ◽  
pp. 1019-1022 ◽  
Author(s):  
Seong Ho Son ◽  
Sung Cheol Park ◽  
Man Seung Lee
Keyword(s):  
Metal Oxides ◽  
Noble Metal ◽  
Titanium Substrate ◽  
Life Time ◽  
Oxide Thickness ◽  
Surface Pretreatment ◽  
Copper Electroplating ◽  
Noble Metal Oxides ◽  
Pre Treatment ◽  
Electroplating Process

Abstract In order to enhance the long-term stability of DSA for copper electroplating process, in the present study, noble metal oxides with excellent electrochemical properties was used and optimum condition was determined the ratio of noble metal oxides, surface pre-treatment of titanium substrate and heat treatment. The effect of the surface pretreatment of titanium substrate and ratio of noble metal oxides were estimated by accelerated test at the highly current density conditions. The lifetime of DSA increase six-fold higher as the oxide thickness of Ta 7 : Ir 3 composition ratio. Under the optimal condition, surface pretreatment led to dramatic increase in the lifetime of DSA.

scholarly journals Electrochemical evaluation of the hydroxyapatite coating synthesized on the AZ91 by electrophoretic deposition route

2021 ◽  
Vol 1 (2) ◽  
pp. 85-91
Author(s):  
Arezoo Jangjoo Tazeh Kand ◽  
Fereshteh Afaghi ◽  
Arvin Taghizadeh Tabrizi ◽  
Hossein Aghajani ◽  
Hilal Demir Kivrak
Keyword(s):  
Corrosion Resistance ◽  
Electrophoretic Deposition ◽  
Electrochemical Impedance ◽  
Peak Height ◽  
Surface Parameters ◽  
Force Microscopy ◽  
Maximum Peak ◽  
Meaningful Relationship ◽  
Sbf Solution ◽  
Pit Depth

The hydroxyapatite layer was deposited on the commercial magnesium alloy of AZ91 by electrophoretic deposition route, and the corrosion behavior of applied layers was studied by polarization and electrochemical impedance spectroscopy at the Simulated Body Fluid (SBF) solution. The best corrosion resistance improvement was obtained for the sample synthesized at 40 V within 4 minutes. Also, the morphology of coated samples was studied by atomic force microscopy (AFM) and the surface parameters were measured. It could be concluded that the calculated values for surface parameters including surface roughness, maximum peak height, maximum pit depth, and maximum peak have a meaningful relationship with corrosion resistance.

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