Preparation and Performance of Micro-Arc Oxidation Ceramic Coating of Titanium Alloy in Low Current Density

2011 ◽  
Vol 335-336 ◽  
pp. 708-712
Author(s):  
Jian Jun Xi ◽  
Jun Zhao ◽  
Guo Jun Niu
Keyword(s):  
Titanium Alloy ◽  
Friction Coefficient ◽  
Surface Morphology ◽  
Current Density ◽  
Ceramic Coating ◽  
Low Power Consumption ◽  
Bipolar Pulse ◽  
Phosphate Silicate ◽  
Micro Arc Oxidation ◽  
And Performance

In this paper, Three types of electrolyte (phosphate, silicate, aluminum) are considered to make preparation for micro-arc oxidation coatings on titanium alloy by bipolar pulse MAO oxidation power with low power consumption (density of current less than 1A/dm2). Treated by micro-arc oxidation, dense micro-arc oxidation ceramic coating is formed on titanium alloy. Surface morphology and friction coefficient of MAO coating is analyzed. The research on the effect of NaF on ablation of MAO coating is prepared, which guides the configuration of the electrolyte later.

Preparation and Performance of Ceramic Coatings Formed by Micro Arc Oxidation on Titanium Alloy

2008 ◽  
Vol 375-376 ◽  
pp. 323-327
Author(s):  
Ying Xue Yao ◽  
Li Qun Li ◽  
Jian Jun Xi
Keyword(s):  
Titanium Alloy ◽  
Ceramic Coating ◽  
Ceramic Coatings ◽  
Dense Layer ◽  
X Ray Diffraction ◽  
Technological Parameters ◽  
Tc4 Titanium Alloy ◽  
Micro Arc Oxidation ◽  
Anodic Voltage ◽  
And Performance

The effect of technological parameters on MAO ceramic coating were investigated through the technique of micro-arc oxidation (MAO) on TC4 titanium alloy and. Microstructure and morphology of coatings were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The result shows that electric parameters and compositions of the electrolyte have notable effects on the growth of MAO ceramic coatings. The cathodic and anodic voltage rise gradually with the oxidation time increasing. The growth rate of ceramic coating is fast at the beginning, and then turns slowly. The ceramic coatings can be divided into three layers from interior to exterior, such as the transition layer, the dense layer and the porous layer. The coating is mainly composed of rutile and anatase and combined with the substrate firmly. The ceramic coating’s composition in inner and outer layers appears quite different. The ceramic coating on titanium alloy is of excellent performance on anti-attrition and anti-corrosion.

Preparation and performance of alumina ceramic coating doped with aluminum nitride by micro arc oxidation

2020 ◽  
Vol 46 (10) ◽  
pp. 17112-17116 ◽  
Author(s):  
Wei Yang ◽  
Shangkun Wu ◽  
Dapeng Xu ◽  
Wei Gao ◽  
Yuhong Yao ◽  
...  
Keyword(s):  
Aluminum Nitride ◽  
Ceramic Coating ◽  
Alumina Ceramic ◽  
Micro Arc Oxidation ◽  
And Performance

The Effects of Magnetic Field on Micro-Arc Oxidation Ceramic Coating on Magnesium Alloys

2014 ◽  
Vol 960-961 ◽  
pp. 143-147
Author(s):  
Jun Zhao ◽  
Jian Jun Xi ◽  
Zhi Gang Wang ◽  
Chun Ping Zhao
Keyword(s):  
Magnetic Field ◽  
Corrosion Resistance ◽  
Electron Microscope ◽  
Friction Coefficient ◽  
Ceramic Coating ◽  
Ceramic Coatings ◽  
Oxidation Method ◽  
Polarization Test ◽  
Micro Arc Oxidation ◽  
Scanning Electron

Ceramic coatings were prepared on ZM5 magnetism substrate by micro-arc oxidation method with and without magnetism filed in silicate electrolyte. The morphology of the MAO coatings was investigated by scanning electron microscope (SEM). The friction coefficient of the MAO coatings prepared with magnetism is about 0.2 and more stable than the coatings prepared without magnetism. The polarization test indicated that the coating prepared with magnetism has better corrosion resistance.

Effect of Thermal Oxidation Temperature on the Properties of Micro-Arc Oxidation Ceramic Coating on TC4 Alloy

2016 ◽  
Vol 697 ◽  
pp. 623-626
Author(s):  
Er Xin Ni ◽  
Ji Kang Yan ◽  
Yun Feng Wu ◽  
Yuan Teng ◽  
Zhi Cao Duan ◽  
...  
Keyword(s):  
Phase Composition ◽  
Surface Morphology ◽  
Thermal Oxidation ◽  
Ceramic Coating ◽  
Oxidation Temperature ◽  
Micro Hardness ◽  
Hardness Tester ◽  
Coating Surface ◽  
Tc4 Alloy ◽  
Micro Arc Oxidation

The effect of thermal oxidation temperature on the properties of MAO ceramic coating was investigated, The phase composition and surface morphology of composite oxidation coating were analyzed by XRD and SEM. The micro-hardness of composite oxidation coating were tested by micro hardness tester. The results shown that the composite oxidation coating consists of rutile, anatase Ti and HA. With the thermal oxidation temperature increasing, the micro-hardness of composite oxidation coatings were improved, but when the thermal oxidation temperature rose from 600 °C to 700 °C, the micro-hardness of coating dropped from 575 HV to 505 HV. With the thermal oxidation temperature increasing, the numbers of micro-porous on coating surface was decreased , and the composite oxidation coating became more density.

Investigation of the Anti-Corrosion Ceramic Coating Formed on AZ91D Magnesium Alloy by Micro-Arc Oxidation

2007 ◽  
Vol 353-358 ◽  
pp. 1645-1648 ◽  
Author(s):  
Dong Chu Chen ◽  
Wen Fang Li ◽  
Jun Jie
Keyword(s):  
Magnesium Alloy ◽  
Ceramic Coating ◽  
Silicate Solution ◽  
Processing Parameters ◽  
Time Duration ◽  
Compact Structure ◽  
Az91d Magnesium Alloy ◽  
Micro Arc Oxidation ◽  
Coating Formation ◽  
And Performance

A new micro-arc oxidation method with a home-made asymmetric alternating-current (ac) power supply for forming an anti-corrosion ceramic coating on AZ91D magnesium alloy was presented, and two different silicate-based and aluminate-based preparing solutions were introduced to coating formation. The effect of many processing parameters on the growth and performance of the formed ceramic coating was investigated. It was found that the electrolyte concentration, current density, treating time duration and other parameters have significant influence on the coating morphology and anti-corrosion performance. Through the polarization curve test, it showed that the coating oxidized in silicate solution has better corrosion-resistance due to its continuous and compact structure than that formed in aluminate solution. The morphology and microstructure of the coating were analyzed through SEM, XRD technology. The coating consists of two layers, i.e., loose layer and compact layer. The compositions and phase structures varied with electrolytes, and it was found that the micro-arc oxidation coating prepared in silicate solution is composed of MgO and Mg2SiO4, while the coating prepared in aluminate is mainly composed of MgAl2O4.

Effects of Different Preparation Parameters on the Properties of MAO Coatings

2014 ◽  
Vol 609-610 ◽  
pp. 14-19 ◽  
Author(s):  
Xin Wu ◽  
Qing Min Liu ◽  
Hong Xia Li
Keyword(s):  
Mechanical Properties ◽  
Growth Rate ◽  
Wear Resistance ◽  
Current Density ◽  
Ceramic Coating ◽  
Electrolyte Concentration ◽  
Measurement Properties ◽  
Micro Hardness ◽  
Micro Arc Oxidation ◽  
Hardness Values

Effects of different preparation parameters on the structural and mechanical properties of micro-arc oxidation coatings prepared in silicate electrolyte on 6063 alloy were investigated. The results show that the growth rate of ceramic coating increases with increasing current density and electrolyte concentration. The prepared coating had denser and smoother surface with few defects, higher micro-hardness values and better wear resistance when the current density was increased to 20A/dm2. The measurement properties were all up to their optimum values when the electrolyte concentration was in the range of 9-12g/l and oxidation time was 60min, respectively.

Study Affection of Nano-Al2O3 Additive on the Corrosion Resistance of Micro-Arc Oxidation Film of Titanium Alloy TC4

2012 ◽  
Vol 472-475 ◽  
pp. 2707-2711 ◽  
Author(s):  
Pei Nian Wu ◽  
Guo Jun Niu ◽  
Jian Jun Xi ◽  
Jun Zhao
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Surface Morphology ◽  
The Other ◽  
Compact Layer ◽  
Corrosion Resistant ◽  
Pore Area ◽  
Micro Arc Oxidation ◽  
The One ◽  
Α Al2o3

Study the affect of nano-Al2O3 additive on the MAO film of titanium ally, the affect of nano-Al2O3 additive on the surface morphology and the thickness is not remarkable, but the nano-Al2O3 additive is good to improve corrosion resistant of the film. The mechanism of nano-Al2O3 additive improving corrosion resistant of the film is that: on the one hand is improving the content of α- Al2O3 in the film, on the other hand is decreasing the size of the pore area of the film and improving the dense of the loose and compact layer.

The Effect of Current Density to Surface Morphology and Component of Micro-Arc Oxidization Ceramic Coating of Pure Titanium

2016 ◽  
Vol 852 ◽  
pp. 992-999 ◽  
Author(s):  
Lin Xu ◽  
Jian Ning Ding ◽  
Zhen Huang ◽  
Ni Na Han ◽  
Xiao Jing Xu ◽  
...  
Keyword(s):  
Current Density ◽  
Mixed Crystal ◽  
Ceramic Coating ◽  
Pure Titanium ◽  
Film Surface ◽  
X Ray Diffraction ◽  
Average Pore ◽  
X Ray ◽  
Micro Arc Oxidation ◽  
3D Profilometer

The ceramic coating containing anatase TiO2 and rutile TiO2 is fabricated on the surface of pure titanium in the electrolyte of C4H6CaO4-NaH2PO4 by micro-arc oxidation (MAO) method. The effect of different current density to microscopic structure, elemental composition and phase components of Ceramic Coating are studied with scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), 3D profilometer and etc. Results indicate that the ceramic coating on pure titanium by micro-arc oxidation is a porous mixed crystal structure which is mainly composed of such elements as Ti, O, Ca and P. With current density increasing, the average pore diameter and roughness on film surface first increase and then decrease, the porosity increases, the ratio of Ca/P then decreases, the relative content of anatase TiO2 increases and that of rutile TiO2 decreases.

Preparation of Compact Micro-Arc Oxidation Coatings on Aluminum Alloys

2010 ◽  
Vol 33 ◽  
pp. 492-495
Author(s):  
Pei Nian Wu ◽  
J.J. Xi ◽  
Jun Zhao ◽  
T.J. Wang
Keyword(s):  
Aluminum Alloys ◽  
Current Density ◽  
Ceramic Coating ◽  
Ceramic Coatings ◽  
Materials Testing ◽  
Thin Coating ◽  
Micro Structure ◽  
Negative Current ◽  
Micro Arc Oxidation ◽  
Loose Layer

In this paper, a hard and thin coating with no loose layer was formed on the surface of the aluminum LC4 by bipolar micro-arc oxidation power, and the influence of ratio J of the negative current density to the positive current density on the thickness h and the hardness H of micro-arc oxidation coatings was studied. By SEM and other modern materials testing and analyzing techniques, the microstructures of the micro-arc oxidation ceramic coatings were tested and analyzed. It was showed that the micro-structure is compact, and the ceramic coating almost has non-porous layer.

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