Incorporation of Carbon Nanotubes Into Oxide Layer on 7075 Al Alloy by Plasma Electrolytic Oxidation

2011 ◽  
Vol 158 (10) ◽  
pp. C325 ◽  
Author(s):  
Kang Min Lee ◽  
Jong Oh Jo ◽  
Eung Seok Lee ◽  
Bongyoung Yoo ◽  
Dong Hyuk Shin
Keyword(s):  
Carbon Nanotubes ◽  
Oxide Layer ◽  
Plasma Electrolytic Oxidation ◽  
Al Alloy ◽  
7075 Al Alloy ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

INCORPORATION OF MULTI-WALLED CARBON NANOTUBES INTO OXIDE LAYER FORMED ON AL ALLOY BY PLASMA ELECTROLYTIC OXIDATION

2020 ◽  
Vol 27 (11) ◽  
pp. 2050007
Author(s):  
KOANGYONG HYUN ◽  
JUNG-HYUNG LEE ◽  
SEONG-JONG KIM
Keyword(s):  
Carbon Nanotubes ◽  
Oxide Layer ◽  
Plasma Electrolytic Oxidation ◽  
Aqueous Suspension ◽  
Al Alloy ◽  
Time Curve ◽  
Oxide Layers ◽  
X Ray ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Plasma electrolytic oxidation (PEO) is an electrochemical-based surface modification technique that produces oxide layers on valve metals. The PEO process is performed in an electrolyte solution, which offers the possibility of particles’ incorporation into the growing oxide layer. In this study, we employed a PEO technique on a commercial Al alloy in an aqueous suspension of carbon nanotubes (CNTs) to fabricate CNT-incorporated oxide layer. The voltage–time response was recorded during the process. The surface of the resulting oxide layer was characterized by means of a scanning electron microscope (SEM), an energy-dispersive X-ray spectrometer (EDS), and X-ray diffraction (XRD). It was found from the SEM observation that the CNTs were successfully incorporated into the oxide layer. The PEO with the addition of CNTs led to a delay in time to breakdown (50[Formula: see text][Formula: see text][Formula: see text]s) and a decrease in breakdown voltage (442[Formula: see text][Formula: see text][Formula: see text]V) in the voltage–time curve. The microstructural feature was clearly distinguishable between the oxide layers produced with and without CNTs: a pancake-like structure for PEO without CNTs, and a doughnut-like structure for PEO with CNTs. However, neither the results of the structure analysis nor the elemental analysis provides a clear indication of carbon, even though the presence of CNTs in the oxide layer is evident, suggesting that further optimization of CNT concentration is required.

ffect of Na2WO4 in electrolyte on mechanical properties of oxide layer on Al alloy via plasma electrolytic oxidation

2015 ◽  
Vol 53 (8) ◽  
pp. 535-540 ◽  
Author(s):  
Young Gun Ko ◽  
Dong Hyuk Shin ◽  
Hae Woong Yang ◽  
Yeon Sung Kim ◽  
Joo Hyun Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oxide Layer ◽  
Plasma Electrolytic Oxidation ◽  
Al Alloy ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Heat dissipation properties of oxide layers formed on 7075 Al alloy via plasma electrolytic oxidation

2015 ◽  
Vol 269 ◽  
pp. 114-118 ◽  
Author(s):  
Yeon Sung Kim ◽  
Hae Woong Yang ◽  
Ki Ryong Shin ◽  
Young Gun Ko ◽  
Dong Hyuk Shin
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Heat Dissipation ◽  
Al Alloy ◽  
Oxide Layers ◽  
7075 Al Alloy ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

scholarly journals PLASMA ELECTROLYTIC OXIDATION COATING ON 6061 AL ALLOY USING AN ELECTROLYTE WITHOUT ALKALI IONS

2018 ◽  
Vol 54 (5A) ◽  
pp. 151 ◽  
Author(s):  
Quang Phu Tran
Keyword(s):  
Corrosion Resistance ◽  
Oxide Layer ◽  
Plasma Electrolytic Oxidation ◽  
Free Alkali ◽  
Al Alloy ◽  
Micro Hardness ◽  
Alkali Ions ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
6061 Al Alloy

Plasma electrolytic oxidation (PEO) technique is well known to use for modifying the surface of valve metal such as Al, Mg and Ti, which improves mechanical and corrosion resistance properties. PEO is an electrochemical process of oxidation by creating micro-discharges on the surface of metal immersed in an electrolyte under applying a high voltage. Electrolyte used in PEO process is almost based on alkali ions such as Na ion. The report on PEO process using free-alkali ion is very rare. In this study, the oxide layer on 6061 Al alloy was produced in a free-alkali ion electrolyte containing calcium phosphate and ammonia water by PEO method. Microstructure, micro-hardness and corrosion resistance of PEO coated were investigated and discussed. Surface morphology analysis indicated the coating characterized by micro-pores, pan-cakes like, and micro-crakes with pore size and percentage of pores on coating surface are smaller than 1 mm and 2.5 %, respectively. Micro-hardness and corrosion resistance of PEO coated are greatly improved compared to the bare Al alloy. Free-alkali-ions in oxide layer coated on Al alloy is important for many applications today.

Oxide Layer Modification of Mg-Al Alloy Coated by Plasma Electrolytic Oxidation Using Zirconia Particles

2012 ◽  
Vol 463-464 ◽  
pp. 406-409 ◽  
Author(s):  
D.Y. Choi ◽  
J. Hwang ◽  
K.M. Lee ◽  
K.R. Shin ◽  
Y.G. Ko ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Plasma Electrolytic Oxidation ◽  
Al Alloy ◽  
Zirconia Powder ◽  
Corrosion Properties ◽  
Electrolytic Oxidation ◽  
Valve Metal ◽  
Structure Observation ◽  
Plasma Electrolytic ◽  
Peo Coatings

The paper reported the effect of zirconia incorporation on the oxide layer modification of the valve metal such as magnesium coated by plasma electrolytic oxidation (PEO). To incorporate zirconia particles into the oxide layer, PEO coatings were carried out under AC condition in electrolytes containing zirconia powder. After PEO coatings, structure observation revealed that a number of zirconia particles were distributed uniformly throughout the oxide layer while the size and distribution of pores remained unchanged as compared to the results coated by PEO without zirconia. It was found that fine zirconia particles incorporated into the oxide layers played an important role in enhancing the anti-corrosion properties of bare metal.

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