Corrosion-Wear Behavior of TiO2 Films in Hanks’ Solution

2009 ◽  
Vol 79-82 ◽  
pp. 735-738
Author(s):  
He Feng Wang ◽  
Lin Hai Tian ◽  
Wei Yan Liu ◽  
Xiu Yan Li ◽  
Bin Tang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Wear Behavior ◽  
Tio2 Films ◽  
Corrosion Wear ◽  
Surface Alloying ◽  
Gradient Distribution ◽  
X Ray ◽  
Duplex Process ◽  
Process Composition ◽  
Plasma Surface Alloying

TiO2 films were fabricated on stainless steel (SS) substrate by plasma surface alloying and thermal oxidation duplex process. Composition and microstructure of the films were characterized using glow discharge spectrometer (GDOES), X-ray photoelectron spectroscopy (XPS) and XRD. Results reveal that the TiO2 films are dense, homogeneous and existed in a complete anatase structure. Both Ti and O elements show gradient distribution in the films. The wear behavior of TiO2 films in Hanks’ solution indicates that the films display much better wear resistance and antifriction performance than that of SS substrate. Electrochemistry noise tests indicate that the TiO2 films effectively retard the local pitting and crevice corrosion of the SS substrate.

Comparative study of corrosion and corrosion-wear behavior of TiN and CrN coatings on UNS S17400 stainless steel

2018 ◽  
Vol 36 (4) ◽  
pp. 403-412 ◽  
Author(s):  
Hossein Olia ◽  
Reza Ebrahimi-Kahrizsangi ◽  
Fakhreddin Ashrafizadeh ◽  
Iman Ebrahimzadeh
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Physical Vapor Deposition ◽  
Wear Behavior ◽  
Open Circuit ◽  
Corrosion Wear ◽  
Nacl Solution ◽  
Compact Structure ◽  
X Ray ◽  
Electrochemical Tests

AbstractPhysical vapor deposition (PVD) multilayered coatings with titanium nitride and chromium nitride top layers were deposited on UNS S17400 alloy in an attempt to improve the corrosion and corrosion-wear resistance of this stainless steel in corrosive environments. The coatings were produced in an industrial chamber by cathodic arc PVD on heat-treated and mechanically polished stainless steel specimens. The microstructures of the substrates and coatings were characterized by X-ray diffraction and scanning electron microscope equipped with an energy-dispersive X-ray spectroscopy system. To evaluate the corrosion and corrosion-wear resistance, reciprocating-sliding tribometer and electrochemical tests were conducted in 3.5% NaCl solution. The results showed that nitride coatings possess, in general, better corrosion and corrosion-wear resistance compared with bare S17400 substrates. Specimens with CrN top coating revealed a typical compact structure and superior corrosion resistance compared with substrate and TiN top coating. However, the sliding motion damaged the surface with some microcracks on the coating, which act as the diffusion channels for NaCl solution; both TiN and CrN top coats experienced approximately similar behavior in corrosion-wear open-circuit potential testing.

The Transfer Direction of Photogenerated Electrons in BaTiO3/TiO2 and CaTiO3/TiO2

2018 ◽  
Vol 71 (12) ◽  
pp. 965
Author(s):  
Lingfeng Ruan ◽  
Rongying Jiang ◽  
Jing Liu ◽  
Song Liu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Photogenerated Electron ◽  
Tio2 Films ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
X Ray ◽  
Photogenerated Electrons ◽  
Microscopy Techniques ◽  
Transfer Direction ◽  
Physical Principles

BaTiO3/TiO2 and CaTiO3/TiO2 bilayer-type photocatalyst films have been prepared and characterised by X-ray diffraction, Raman, X-ray photoelectron spectroscopy, UV-vis, and scanning electron microscopy techniques. The photodeposition of silver was done to confirm the reduction positions of the titanate/TiO2 films. Silver deposited preferentially on the side of TiO2 for BaTiO3/TiO2 whereas on the side of CaTiO3 for CaTiO3/TiO2. These results imply that the direction of photogenerated electron transfer is coincident with the semiconductor physical principles. Upon exposure to light, electron–hole pairs are generated and subsequently separated by an internal electrostatic field in the titanate–TiO2 heterojunction.

scholarly journals Preparation, Microstructure, Mechanical Properties and Biocompatibility of Ta-Coated 3Y-TZP Ceramic Deposited by a Plasma Surface Alloying Technique

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1265 ◽  
Author(s):  
Ke Zheng ◽  
Liangliang Li ◽  
Yaqian Dong ◽  
Jie Gao ◽  
Hongjun Hei ◽  
...  
Keyword(s):  
Compact Surface ◽  
Surface Alloying ◽  
X Ray Diffraction ◽  
Hydrothermal Aging ◽  
Plasma Surface ◽  
X Ray ◽  
Biaxial Flexural Strength ◽  
Proliferation Ability ◽  
Plasma Surface Alloying Technique ◽  
Plasma Surface Alloying

A Ta coating has been successfully fabricated on the surface of zirconia polycrystals ceramic (3 mol% yttria, 3Y-TZP) by a plasma surface alloying technique. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that a α-Ta coating with a continuous and compact surface morphology which consisted of a deposited layer with a thickness of 390 nm and a diffusion layer with a thickness of 200 nm covered the 3Y-TZP. Due to the effect of inhabitation the t→m transformation by the deposited Ta coating, the biaxial flexural strength caused by the phase transformation during hydrothermal aging is reduced e.g., p < 0.05 after 20 h and/or 100 h. In addition, the Ta coating shows non-cytotoxicity and improved proliferation ability of osteoblasts.

Study on the Influence of N-Doping to the In Situ Growth TiO2 Film Photocatalytic Character

2014 ◽  
Vol 609-610 ◽  
pp. 147-151
Author(s):  
Zhong Chen Yu ◽  
Song Wang ◽  
Xin Wang ◽  
Yuan Lin Niu ◽  
Zhuan Li
Keyword(s):  
Photoelectron Spectroscopy ◽  
Titanium Substrate ◽  
Degradation Efficiency ◽  
Photocatalytic Properties ◽  
Tio2 Films ◽  
X Ray ◽  
N Doping ◽  
Titanium Alloy Substrate ◽  
Different Content

Thin TiO2 films in-situ growth on titanium alloy substrate were prepared in 0.05 mol/L H2SO4 electrolyte using the micro plasma oxidation method. The photocatalytic properties of the prepared thin TiO2 films were invested using Rhodamine B solution as a target pollutant. In order to improve the photocatalytic properties of the obtained TiO2 films, different content NH3·H2O was added into the H2SO4 electrolyte and obtained the N-doped TiO2 films photocatalyst. The influence of the doping ions on the crystal phase composition and microstructure of the TiO2 films were investigated by scanning electron microscopy (SEM) and X ray photoelectron spectroscopy (XPS). The results show that TiO2 films have uniformly grown closely on the surface of titanium substrate with pore size of 100-200 μm. The degradation efficiency of the TiO2 thin film prepared in H2SO4 + NH3·H2O is higher than that prepared with H2SO4, the degradation efficiency can reach 99% after 75 min, which increase about 10% than that of the H2SO4 eletrolyte.

Corrosion and Wear Behavior of Nitrogen-Doped TiO2 Coatings on Stainless Steel Prepared by Plasma Surface Alloying Technique

2011 ◽  
Vol 687 ◽  
pp. 602-609
Author(s):  
He Feng Wang ◽  
Bin Tang ◽  
Xiu Yan Li ◽  
Yong Ma ◽  
Chen Quan Yang
Keyword(s):  
Stainless Steel ◽  
Wear Behavior ◽  
Hybrid Coatings ◽  
Composition Analysis ◽  
Surface Alloying ◽  
Corrosion Properties ◽  
Plasma Surface ◽  
Nitrogen Doped ◽  
Plasma Surface Alloying Technique ◽  
Plasma Surface Alloying

A novel process has been developed to improve tribological and corrosion properties of austenitic stainless steel (S. S). Titanium nitride coatings were obtained by plasma surface alloying technique. Nitrogen-doped titanium dioxide was synthesized by oxidative annealing the resulted TiNx coatings in air. The microstructure of TiO2coatings was characterized by SEM, GDOES, XPS and XRD, respectively. Simulated body solution (Hanks’ solution, 37°C) was used to characterize the electrochemical corrosion properties of the coatings and substrate. Ball-on-disc sliding wear was applied to test and compare the tribological behaviors of the coatings and substrate against Al2O3ball. Results reveal that the resultant coatings have a layered structure, comprising of N-doped TiO2layer at the top and a diffuse-type interface. Such a hybrid coatings system shows good adhesion with the substrate. Composition analysis shows that the coatings shield the substrate entirely. The N-doped TiO2coatings are anatase in structure as characterized by X-ray diffraction. The electrochemical measurements show that the corrosion potential positively shifts from -0.267 V for bare S. S to -0.275 V for N-doped TiO2coated S. S, and the corrosion current density decreases from 1.3 × 10-5A/cm2to 4.1 ×10-6A/cm2. Under a load of 7.6 N, the coefficient of friction is in the range of 0.27～0.38 for the N-doped TiO2and the wear rate of the coatings is only one-fourteenth of that for untreated 316L S. S. Duplex-treated N-doped TiO2coatings display much better wear resistance and antifriction performance than that of S. S.

Mechanism of Enhanced Wear-Resistance of the Ti-Mo Modification Layer

2005 ◽  
Vol 475-479 ◽  
pp. 3947-3950 ◽  
Author(s):  
Lin Qin ◽  
Yan Mei Qin ◽  
Xiao Ping Liu ◽  
Bin Tang ◽  
Zhong Xu
Keyword(s):  
Wear Resistance ◽  
Wear Behavior ◽  
High Wear Resistance ◽  
Surface Alloying ◽  
Wear Model ◽  
Diffusion Layers ◽  
Elasticity Characteristics ◽  
Plasma Surface Alloying Technique ◽  
Plasma Surface Alloying ◽  
Ball On Disc

Mo modified layers on Ti-6Al-4V alloy were obtained with plasma surface alloying technique. The properties of the Mo-diffusion layers were investigated in this paper. Results show that the Mo-diffusion layers obviously enhance the wear resistance of Ti alloys against a polished 2100 steel counterbody ball under ball-on-disc test condition. With a series of experimental results, a wear model of high wear resistance of modified layers is propounded. The noval wear behavior is a result of absolute elasticity characteristics on the subsurface of Mo modified layers.

Wear Behavior of Diamond-Like Carbon Film Coated by Filtered Cathodic Arc

2012 ◽  
Vol 622-623 ◽  
pp. 901-905
Author(s):  
Nattaporn Khamnaulthong ◽  
Krisda Siangchaew ◽  
Pichet Limsuwan
Keyword(s):  
Wear Resistance ◽  
Photoelectron Spectroscopy ◽  
Wear Behavior ◽  
Carbon Film ◽  
Diamond Like Carbon ◽  
Carbon Oxidation ◽  
Film Properties ◽  
X Ray ◽  
Dlc Film ◽  
Cathodic Arc

Diamond-like carbon (DLC films were deposited on NiFe coupon by Filtered Cathodic Arc (FCA) technique. Two different DLC thicknesses were selected to compare thickness dependency on film properties change. The mechanical property as wear resistance under cyclic heating condition was investigated by nanoindenter (Hysitron). The detail of DLC film composition change was also studied using X-ray Photoelectron Spectroscopy (XPS). The roles of heating in material composition and wear behavior of DLC films are discussed. The effect of DLC film thickness is also considered. The results showed that thinner DLC (2 nm) has higher carbon oxidation resulting that deteriorate in wear resistance as compare to thicker one (5 nm). The heating accelerates these oxidation and wear in this study. .

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