Synthesis and Characterization of Aluminum Nitride Ceramic Coating on Aluminum Alloy by Plasma Electrolytic Oxidation in CO(NH2)2 Electrolyte

2012 ◽  
Vol 557-559 ◽  
pp. 1664-1667 ◽  
Author(s):  
Yun Long Wang ◽  
Miao Wang ◽  
Zhao Hua Jiang
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Aluminum Nitride ◽  
Bonding Strength ◽  
Plasma Electrolytic Oxidation ◽  
Ceramic Coating ◽  
Average Diameter ◽  
Ceramic Coatings ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

aluminum nitride ceramic coating were obtained on LY12 aluminum alloy by plasma electrolytic oxidation in CO(NH2)2 electrolyte. The microstructure of the ceramic coating including phase and elements composition, surface and cross section morphology were investigated. The properties of the ceramic coatings such as surface roughness, thickness and bonding strength were primarily studied. The results show that the ceramic coating on LY12 aluminum alloy surface was AlN coating with the thickness of 12 um. The AlN ceramic coating showed rough and porous. The average diameter of the pores was 6 um and the surface roughness was 1.5 um. The bonding strength of the coating was 18 ± 2 MPa.

Characterisation of ceramic coatings produced by plasma electrolytic oxidation of aluminum alloy

2007 ◽  
Vol 447 (1-2) ◽  
pp. 158-162 ◽  
Author(s):  
Wei-Chao Gu ◽  
Guo-Hua Lv ◽  
Huan Chen ◽  
Guang-Liang Chen ◽  
Wen-Ran Feng ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Ceramic Coatings ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Effects of Electrolyte Parameters on Properties of Ceramic Coatings Formed on Aluminum Alloy 7075 by Plasma Electrolytic Oxidation

2013 ◽  
Vol 668 ◽  
pp. 875-879
Author(s):  
Jing Guo Miao ◽  
Run Wu ◽  
Qiu Rong Chen ◽  
Kang Da Hao ◽  
Zhong Ling Wei
Keyword(s):  
Aluminum Alloy ◽  
Plasma Electrolytic Oxidation ◽  
Corrosion Current ◽  
Ceramic Coatings ◽  
X Ray Diffraction ◽  
Compact Structure ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Α Al2o3 ◽  
Aluminum Alloy 7075

Four electrolyte (aluminate, silicate, borate and phosphate) solutions were optimized for using in surface treatment of 7075 aluminum alloy by plasma electrolytic oxidation. Microstructure, phase composition and corrosion resistance of ceramic coatings on the surface were analyzed by SEM, X-ray diffraction as well as electrochemical work station. It was showed that ceramic coatings prepared in aluminate solution had excellent continuity, compact structure with micro hardness of HV0.1 1100. The major portion of all coatings consisted of γ-Al2O3 and bits of α-Al2O3, the corrosion potential was increased by a small extent while the corrosion current density was significantly reduced.

Titanium carbide’s effects on coatings formed on D16T aluminum alloy by plasma electrolytic oxidation

2020 ◽  
Vol 67 (1) ◽  
pp. 48-58
Author(s):  
Wanying Liu ◽  
Junjie Yang ◽  
Yuhong Qiu ◽  
Ying Liu ◽  
Kuanhai Deng
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Titanium Carbide ◽  
Plasma Electrolytic Oxidation ◽  
Ceramic Coatings ◽  
Content Type ◽  
X Ray ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings

Purpose The preferable concentration of titanium carbide was optimized and added as an additive to the micro-arc oxidation electrolyte to produce a high corrosion-resistant coating on D16T aluminum alloy. Design/methodology/approach Ceramic coatings were deposited on D16T aluminum alloy by plasma electrolytic oxidation in alkaline silicate electrolytes with micron titanium carbide particle suspending at different concentrations. Influences of additive concentration on morphology, elemental and phase composition and corrosion resistance of doped PEO coatings were evaluated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and electrochemical methods, respectively. Findings Results revealed that suspending titanium carbide additives incorporated into ceramic coatings through discharging channels and chemically transformed into amorphous stage. The content of titanium in the doped coatings increased with the increasing concentration of suspending micron additive. Compared with the coating without particle addition, the corrosion resistance of the coating produced in 8 g/L titanium carbide suspension increased more than 20 times. The result indicated that the incorporation of titanium into the PEO coatings formed on the D16T aluminum alloy could effectively improve the corrosion resistance. Originality/value The mechanism of corporation of TiC and the mechanism of improving the corrosion resistance of the coating were proposed.

Characterization of Graphite Containing Ceramic Coating Prepared on Carbon Steel by Plasma Electrolytic Oxidation

2012 ◽  
Vol 271-272 ◽  
pp. 46-49 ◽  
Author(s):  
Yun Long Wang ◽  
Miao Wang ◽  
Ming Zhou ◽  
Zhao Hua Jiang
Keyword(s):  
Carbon Steel ◽  
Current Density ◽  
Bonding Strength ◽  
Plasma Electrolytic Oxidation ◽  
Substrate Surface ◽  
Ceramic Coatings ◽  
Electrolytic Oxidation ◽  
Q235 Carbon Steel ◽  
Current Densities ◽  
Plasma Electrolytic

Ceramic coatings containing graphite were prepared on Q235 carbon steel by plasma electrolytic oxidation (PEO) in aluminate electrolyte with graphite dispersed in electrolyte. The microstructure and properties of the coatings including phase composition, surface and cross section morphology, thickness and bonding strength were characterized. The results showed that the coating consisted of FeAl2O4, Fe3O4 and a certain amount of graphite. The coating was typically characterized by micro pores and ball-shaped round grains distributed on the surface. With increasing the treating current density, the pores became bigger and the ball-shaped round grains became more. Coatings obtained with various current densities showed a good interface between the coating and substrate. The bonding strength of the coatings decreased a little when increasing the current densities, the values of which were all above 20MPa. The coating grew both inwards and outwards to the substrate surface. With increasing the treating current density, the consumption of substrate gradually increased but the whole thickness was not strongly affected by the current density and the value was about 115 μm.

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