Study on corrosion resistance of TC4 titanium alloy Micro‐arc oxidation/(PTFE + graphite) composite coating

2021 ◽  
Author(s):  
Xiaowen Chen ◽  
Jie Hu ◽  
Defen Zhang ◽  
Peng Ren ◽  
Dandan Liao ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Composite Coating ◽  
Graphite Composite ◽  
Tc4 Titanium Alloy ◽  
Micro Arc Oxidation

Corrosion and Wear Properties of h-BN Modified TC4 Titanium Alloy Micro-Arc Oxide Coatings

2022 ◽  
pp. 1-10
Author(s):  
X W Chen ◽  
P Ren ◽  
D F Zhang ◽  
J Hu ◽  
C Wu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Hexagonal Boron Nitride ◽  
Corrosion Current ◽  
Ceramic Coatings ◽  
Element Distribution ◽  
Wear Properties ◽  
Tc4 Titanium Alloy ◽  
Micro Arc Oxidation

In this study, ceramic coatings were prepared on the surface of TC4 titanium alloy by micro-arc oxidation (MAO). The morphology, element distribution and phase composition of MAO coatings were analyzed by SEM, EDS, XRD and other analytical methods. The effect of hexagonal boron nitride(h-BN) doping on wear resistance and corrosion resistance of micro-arc oxidation layer was studied. The results show that the coating is mainly composed of rutile TiO2, anatase TiO2 and a small amount of h-BN. Furthermore, the composite coating containing h-BN was less porous than particle-free coating. The test results show that h-BN doping slightly affects the hardness of the MAO coating, and it is helpful in improving the thickness, corrosion resistance and wear resistance of the coatings. When the amount of h-BN is 3 g/L, the corrosion current density of the coating is the smallest; When the addition of h-BN is 1.5 g/L, the friction coefficient of the coating is the smallest. The wear mechanism was adhesive wear, accompanied by slight abrasive wear.

Study on the Corrosion Behaviors of MAO Coated on TC4 Titanium Alloy

2012 ◽  
Vol 518-523 ◽  
pp. 632-636
Author(s):  
Jian Jun Xi ◽  
Jun Zhao
Keyword(s):  
Dielectric Constant ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Ac Impedance ◽  
Compact Layer ◽  
Soaking Time ◽  
Tc4 Titanium Alloy ◽  
Pore Area ◽  
Corrosion Behaviors ◽  
Loose Layer

This paper provides the method of calculating the film pore area and comparing the density of the looser and compact layer by AC impedance, then to compare the corrosion resistance of the film by comparing the pore area and the dielectric constant. The resistance of the film decreases fellow the soaking time extending, the capacitance of the loose and compact layer increases with the soaking time extending. The capacitance of the compact layer is smaller than that of the loose layer.

Influence of Voltage on the Biological Performance of Micro-Arc Oxide Films Based on TC4 Titanium Alloy

2016 ◽  
Vol 697 ◽  
pp. 612-616
Author(s):  
Ji Kang Yan ◽  
Yuan Teng ◽  
Er Xin Ni ◽  
Yun Feng Wu ◽  
Yan Hua Sun ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Bone Tissue ◽  
Bone Cells ◽  
Porous Ceramic ◽  
Animal Experiments ◽  
Oxide Films ◽  
Biological Properties ◽  
Ceramic Surface ◽  
Tc4 Titanium Alloy ◽  
Micro Arc Oxidation

The porous ceramic biologic films were prepared on the surface of Ti6Al4V (TC4) with micro-arc oxidation technology (MAO). The phase composition, microstructure and valence state of micro-arc oxide films were studied. The biological properties of the ceramic film were comprehensive evaluated through animal experiments. Results show that with increasing of the micro-arc oxidation voltage, the better biocompatible hydroxyapatite appears on the surface of titanium alloy (TC4). The high voltage promotes the surface pore size enlarge. The porous ceramic surface makes bone tissue early grow up. Pathological sections of bone tissue 24 w animal experiments indicates that the implants can form good biological combination with bone, no rejection and the higher the micro-arc oxidation voltage, the more new bone cells.

scholarly journals Microstructure and Wear Resistance of WS2/W Composite Coating on TC4 Titanium Alloy Surface

2021 ◽  
Vol 1885 (3) ◽  
pp. 032046
Author(s):  
Junqi Huang ◽  
Jie Ma ◽  
Long Wu ◽  
Jianzhong Wei ◽  
Hongyi Li
Keyword(s):  
Wear Resistance ◽  
Titanium Alloy ◽  
Composite Coating ◽  
Alloy Surface ◽  
Tc4 Titanium Alloy

Study on Properties of Al2TiO5 Coating on Ti-6Al-4V Titanium Alloy

2013 ◽  
Vol 575-576 ◽  
pp. 348-351
Author(s):  
Nian Suo Xie ◽  
Jin Wang
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Sulfuric Acid ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Acid Corrosion ◽  
Temperature Oxidation ◽  
Micro Arc Oxidation ◽  
Sulfuric Acid Corrosion

The Al2TiO5Coating was deposited on Ti-6Al-4V alloy substrate by homemade micro-arc oxidation system. The microstructure of Ti-6Al-4V titanium alloy, the phase of coating, the bonding force of the coating and matrix, sulfuric acid corrosion resistance and high-temperature oxidation resistance were study by inverted microscope model, Xray diffract meter, scanning electron microscopy, the coating adhesion automatic scratch tester, box-type furnace. The results show that the phase of coating is composed of Al2TiO5and Al2SiO5, and Al2TiO5.is the main component, the coating surface consists of discharging pit and flange which are unequal in size, rough and overlap and micro-arc oxidation pit diameter increases with the voltage. When micro-arc oxidation voltage is constant, the longer micro-arc oxidation time, the greater the Ti-6Al-4V alloy coating and the substrate binding force. The corrosion resistance of Ti-6Al-4V alloy was improved in sulfuric acid due to micro-arc oxidation; the sulfuric acid corrosion resistance of the coated samples was improved 11 times when the micro-arc oxidation time increased from 5min to 60min. the high-temperature oxidation resistance of Ti-6Al-4V alloy with micro-arc oxidation coatings is higher than Ti-6Al-4V alloy without micro-arc oxidation coating.

Effects of On-Time on Microstructure and Corrosion Resistance of Pulse-Micro-Arc Oxidation Coatings Formed on Titanium Alloy

2013 ◽  
Vol 845 ◽  
pp. 735-739
Author(s):  
Yen Shou Chen ◽  
Yao Yang Tsai
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Titanium Dioxide ◽  
Manufacturing Process ◽  
Titanium Substrate ◽  
New Method ◽  
Manufacturing Processes ◽  
Micro Arc Oxidation ◽  
Superior Level

Titanium dioxide (TiO2) has widely been applied in various fields of industry and technology. To improve the corrosion resistance of TiO2, many manufacturing processes have been researched. MAO is a new method of the TiO2 manufacturing process, of which titanium dioxide is coated on titanium substrate. According to electrochemistry researches, there is a more superior level for Pulse-MAO than traditional MAO. Parameters of on-time were significant in the Pulse-MAO process. The results show that on-time affects reactant shape, morphologies, thickness of films, and corrosion resistance. When on-time increased, the size of reactants was bigger and the shape of reactants was changed from sphere to lump. Meanwhile, the corrosion resistance and thickness of the film increased.

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