Characterization of Ceramic Coatings on ZL114 Aluminum Alloy Prepared in Alkaline Electrolyte Adding Nano-Al2O3 by Micro-Arc Oxidation

2011 ◽  
Vol 418-420 ◽  
pp. 804-807 ◽  
Author(s):  
Jun Zhao ◽  
Jian Jun Xi
Keyword(s):  
Aluminum Alloy ◽  
Surface Properties ◽  
Alkaline Solution ◽  
Ceramic Coatings ◽  
Alkaline Electrolyte ◽  
Corrosion Performance ◽  
Micro Arc Oxidation

ZL114 aluminum alloy samples were treated by micro-arc oxidation using alkaline solution added different amount of nano-Al2O3to improve the surface properties. Effects of the additives were investigated by thickness, hardness, morphologies and corrosion performance. The results indicated that proper amount of nano-Al2O3had certain contribution with higher corrosion performance. And adding too much nano-Al2O3decreased the property of ceramic coatings.

Effect of Current Density on the Microstructure and Corrosion Properties of MAO Coatings on Aluminum Alloy Shock Absorber

2018 ◽  
Vol 764 ◽  
pp. 28-38 ◽  
Author(s):  
Yan Shen ◽  
Hong Xiang Wang ◽  
Yi Peng Pan
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Current Density ◽  
Shock Absorber ◽  
Structural Characteristics ◽  
Ceramic Coatings ◽  
Corrosion Performance ◽  
Cathode Voltage ◽  
Corrosion Properties ◽  
Micro Arc Oxidation

In order to improve the corrosion resistance of shock absorber for ships, the alumina ceramic coatings are carried out on the surface of aluminum alloy shock absorber by micro arc oxidation (MAO) technology. The microstructure and anti-corrosion performance of the MAO coatings were investigated experimentally. This paper mainly focuses on the experimental work to determine the effect of current density on the structural characteristics and corrosion resistance of MAO coatings. The results show that the current density has a significant influence on the preparation of MAO coating during the process. The surface of the coating becomes more compact and smooth with the cathode voltage of 7 A.dm-2. Furthermore, the anti-corrosion performance of the MAO coatings can effectively be improved at the current density of 7 A.dm-2.

Characterization of ZrO2 ceramic coatings on ZrH1.8 prepared in different electrolytes by micro-arc oxidation

Rare Metals ◽  
2015 ◽  
Author(s):  
Zhi-Gang Wang ◽  
Wei-Dong Chen ◽  
Shu-Fang Yan ◽  
Xiu-Juan Fan ◽  
Zhi-Gao Xu
Keyword(s):  
Ceramic Coatings ◽  
Micro Arc Oxidation

Effects of graphene on the microstructure and properties of MAO coatings formed on AA7050

2020 ◽  
Vol 111 (6) ◽  
pp. 463-468
Author(s):  
Bo Xu ◽  
Yafeng He ◽  
Xiangzhi Wang ◽  
Weimin Gan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Composite Coatings ◽  
Ceramic Coatings ◽  
X Ray Diffraction ◽  
X Ray ◽  
Micro Arc Oxidation ◽  
Scanning Electron

Abstract Ceramic coatings were prepared on the surface of 7050 highstrength aluminum alloy using micro-arc oxidation in an aluminate electrolyte with added graphene. To analyze the surface morphology, roughness, phase composition, and corrosion resistance, scanning electron microscopy, X-ray diffraction, X-ray photoelectron, and electrochemical measurements were used, respectively. The addition of 9 g · L-1 of graphene to the electrolyte decreased the micro-pore size of the composite coatings and improved the density. In addition, with the addition of graphene, the roughness was the lowest, and the corrosion resistance was significantly improved.

Effects of Al2O3 Nanoparticles on Microstructure and Performance of Ceramic Coatings by Micro-Arc Oxidation

2013 ◽  
Vol 537 ◽  
pp. 92-96
Author(s):  
Yu Jun Yin ◽  
Shu Hua Li ◽  
Da Wei Shen ◽  
Yuan Yuan Zu ◽  
Chang Zheng Qu
Keyword(s):  
Aluminum Alloy ◽  
Oxide Coating ◽  
Ceramic Coatings ◽  
Al2o3 Nanoparticles ◽  
Electrolytic Solution ◽  
Dense Ceramic ◽  
Micro Arc Oxidation ◽  
And Performance ◽  
Microstructure And Performance ◽  
Ceramic Oxide Coating

A dense ceramic oxide coating approximately 45 µm thick was prepared on a Ly12 aluminum alloy by micro-arc oxidation in an alkali-phosphate electrolytic solution. Coating thickness and surface roughness (Ra) were measured after the coating had been synthesized. The effects of Al2O3 Nanoparticles in electrolyte on phase composition, microstructure and microhardness of the micro-arc oxidation ceramic coatings on Ly12 aluminum alloy were investigated by means of XRD, SEM and hardness experimentation. The results show that the ceramic coatings become more dense and its microhardness increased by adding Al2O3 Nanoparticles in electrolyte. In addition, the roughness of the micro-arc oxidation ceramic coatings is obviously improved by addition of Al2O3 Nanoparticles.

scholarly journals Influence of TiO2 Additives on Cavitation Erosion Resistance of Al-Mg Alloy Micro-Arc Oxidation Coating

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 521 ◽  
Author(s):  
Hongyan Jiang ◽  
Feng Cheng ◽  
Dianjun Fang
Keyword(s):  
Aluminum Alloy ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Ceramic Coatings ◽  
Chemical Compositions ◽  
Additive Concentration ◽  
Cavitation Damage ◽  
Short Period ◽  
Micro Arc Oxidation ◽  
Cavitation Erosion Resistance

Four ceramic coatings are fabricated on 6061 aluminum alloy substrates with a micro-arc oxidation technique in silicate electrolytes with different TiO2 nano-additive concentrations. To explore the cavitation erosion resistance of the micro-arc oxidation (MAO) coating, cavitation tests are performed using a vibratory test rig. After cavitation tests lasting 10 min, the mass losses, surface morphologies, and chemical compositions of the samples after cavitation tests are examined using a digital balance, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS), respectively. The results indicate that, in contrast to the aluminum alloy, the MAO coatings, by adjusting TiO2 nano-additive concentration, can decrease the mean depth of erosion rate (MDER) due to the cavitation damage, and lead to an excellent cavitation erosion resistance. The results also show that: In contrast to aluminum alloy, MAO coatings can decrease the MDER due to the cavitation damage in a short period of time by adjusting TiO2 nano-additive concentration. With the increase of TiO2 nano-additive concentration, the compactness and the surface hardness of MAO coatings decrease, which can easily lead to larger erosion pits.

The Preparation and Performance of LC4 Aluminum Alloys Ceramic Coatings with Trace Loose Layer Treated by Micro-Arc Oxidation

2014 ◽  
Vol 528 ◽  
pp. 3-7
Author(s):  
Jun Zhao ◽  
Jian Jun Xi ◽  
Chun Ping Zhao ◽  
Yu Jia Sun
Keyword(s):  
Aluminum Alloy ◽  
Mechanical Characteristics ◽  
Mechanical Performance ◽  
Ceramic Coatings ◽  
X Ray ◽  
Micro Arc Oxidation ◽  
And Performance ◽  
High Temperature Erosion ◽  
Loose Layer ◽  
Performance Structure

LC4 aluminum alloy samples were treated by micro-arc oxidation (MAO) to produce trace loose layer film to improve the surface properties. The mechanical characteristics, high temperature erosion performance, structure and composition were investigated by strength tester, high flame erosion, scanning electron microscopy and energy-dispersive X-ray spectrometry. Compared to the untreated aluminum alloy, MAO coatings have good mechanical performance with tensile strength bigger than 18MPa and is intact with 20s heat ablation of 1900°C.

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