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.

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

Corrosion Protection of a SiCp/ZL101 Composites by Using Plasma Electrolytic Oxidation Method

2009 ◽  
Vol 79-82 ◽  
pp. 1071-1074
Author(s):  
Shi Hai Cui ◽  
Hong Tao Tang ◽  
Jian Yu Li ◽  
Jian Min Han
Keyword(s):  
Corrosion Resistance ◽  
Plasma Electrolytic Oxidation ◽  
Salt Spray ◽  
Xrd Analysis ◽  
Ceramic Coatings ◽  
Immersion Test ◽  
Aluminum Composites ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Α Al2o3

A dense ceramic coatings with a thickness of 95μm was fabricated on a SiCp/ZL101 aluminum composites by using a plasma electrolytic oxidation(PEO) method. The XRD analysis showed that the PEO coating was mainly composed of α-Al2O3 γ-Al2O3 and mullite.The corrosion resistance of the PEO coatings and SiCp/ZL101 aluminum composites was estimated by the immersion test, salt spray test and electrochemical test. All the test results showed that the corrosion resistance of the composite was improved by the existence of the ceramic coating.

Tribological Properties of the Ceramic Coatings Prepared by Plasma Electrolytic Oxidation (PEO) on the Al6061 Alloy

2010 ◽  
Vol 123-125 ◽  
pp. 1063-1066 ◽  
Author(s):  
Kai Wang ◽  
Sang Sik Beyun ◽  
Bon Heun Koo ◽  
Yi Qi Wang ◽  
Jung I. Song
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Ceramic Coatings ◽  
X Ray Diffraction ◽  
Abrasive Resistance ◽  
X Ray ◽  
Electrolytic Oxidation ◽  
Microhardness Profile ◽  
Al6061 Alloy ◽  
Plasma Electrolytic ◽  
Phosphate Electrolyte

The ceramic coatings were prepared on the T6-tempered Al6061 alloy substrate under a hybrid voltage by PEO treatment in 5-30 min in a phosphate electrolyte. The X-Ray diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate the coating microstructures. With increasing the PEO treating time, the different compositions of coatings eliminate the sharp slope of the microhardness profile. The coatings PEO-treated in 30min presents excellent abrasive resistance property.

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.

Growth Mechanism and Corrosion Behavior of Ceramic Coatings on CP-Ti Produced by Plasma Electrolytic Oxidation

2010 ◽  
Vol 154-155 ◽  
pp. 896-901
Author(s):  
Ping Yi Guo ◽  
Yong Shao ◽  
Yuan Xin Ji ◽  
Wen Tai Zhu ◽  
Han Yan
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Corrosion Current ◽  
Ceramic Coatings ◽  
Short Treatment ◽  
Linear Behavior ◽  
Electrolytic Oxidation ◽  
Naoh Solution ◽  
Plasma Electrolytic ◽  
Cp Ti ◽  
Passive Current

Ceramic coatings were prepared in situ on commercial pure Ti(CP-Ti) by Plasma Electrolytic Oxidation(PEO) technology in an environmental-friendly solution. The voltage–time responses were recorded during different PEO processes. For short treatment times, the formation processes of ceramic coatings follow a linear kinetics, while for longer times the kinetics departs from the linear behavior. The surficial morphology and composition of the coatings was studies by X-ray diffraction(XRD) and scanning electron microscopy (SEM). The acted electrochemical method was used to evaluate the corrosion of the coated samples in 1moll-1 NaOH solution. The potentiodynamic polarization curves of coated titanium samples and the untreated metal substrate show that the PEO coated titanium samples possess much higher corrosion potential and lower corrosion current than uncoated aluminum alloy. It is noticed that the passive current density of the samples decreased from 10-4A/cm2, for the titanium, to 10-7 A/cm2, for PEO coated titanium sample.

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.

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