MICROSTRUCTURES AND ABRASIVE PROPERTIES OF THE OXIDE COATINGS ON Al6061 ALLOYS PREPARED BY PLASMA ELECTROLYTIC OXIDATION IN DIFFERENT ELECTROLYTES

2010 ◽  
Vol 17 (03) ◽  
pp. 271-276
Author(s):  
KAI WANG ◽  
SANGSIK BYUN ◽  
CHAN GYU LEE ◽  
BON HEUN KOO ◽  
YI QI WANG ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Wear Test ◽  
Xrd Analysis ◽  
Test Results ◽  
X Ray Diffraction ◽  
Abrasive Resistance ◽  
Electrolytic Oxidation ◽  
Abrasive Properties ◽  
Coating Microstructure ◽  
Plasma Electrolytic

Al 2 O 3 coatings were prepared on T6-tempered Al6061 alloys substrate under a hybrid voltage (AC 200 V–60 Hz and DC 260 V value) by plasma electrolytic oxidation (PEO) in 30 min. The effects of different electrolytes on the abrasive behaviors of the coatings were studied by conducting dry ball-on-disk wear tests. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate the coating microstructure. XRD analysis results show that the coatings mainly consist of α- and γ- Al 2 O 3, and some mullite and AlPO 4 phase in Na 2 SiO 3 and Na 3 PO 4 containing electrolytes, respectively. The wear test results show that the coatings which were PEO-treated in Na 3 PO 4 containing electrolyte presented the most excellent abrasive resistance property.

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.

Plasma Electrolytic Oxidation and Characterization of Spark Plasma Sintered Magnesium/Hydroxyapatite Composites

2013 ◽  
Vol 765 ◽  
pp. 827-831 ◽  
Author(s):  
R. Viswanathan ◽  
N. Rameshbabu ◽  
Sarangapani Kennedy ◽  
D. Sreekanth ◽  
K. Venkateswarlu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Plasma Electrolytic Oxidation ◽  
Test Results ◽  
X Ray Diffraction ◽  
Morphological Studies ◽  
Plasma Sintering ◽  
Electrolytic Oxidation ◽  
Spark Plasma ◽  
Plasma Electrolytic

Magnesium (Mg)/hydroxyapatite (HA) (10 wt.% and 20 wt.%) composites were prepared by using pure Mg and as synthesized HA powders using the spark plasma sintering (SPS) method. The objective of the present study is to improve the corrosion resistance of spark plasma sintered Mg/HA composites and to ensure that the degradation time of these composites match with that of bone remodeling. Mg and HA powders were ball milled for 2 h and spark plasma sintered at a temperature of 475 °C and pressure of 40 MPa in vacuum. The sintered compacts were further treated by plasma electrolytic oxidation (PEO) in order to improve the corrosion resistance. The structural, microstructural and morphological studies were done using X-ray diffraction, optical microscopy and scanning electron microscopy, respectively. The corrosion resistance of as-sintered and PEO treated Mg/HA composites was studied by potentiodynamic polarization test in a 7.4 pH simulated body fluid (SBF) environment. The corrosion test results of as-sintered composites showed that the corrosion resistance decreases with the increase in percentage of HA in the composite. However, the PEO treated Mg/HA composites have shown delayed onset of degradation. Therefore, it can be hypothesized that the PEO treated Mg/HA composites would serve as bioactive and biodegradable orthopedic implant materials with low corrosion rates.

scholarly journals Nanodesigned coatings obtained by plasma electrolytic oxidation of titanium implant and their cytotoxicity

2021 ◽  
Vol 19 ◽  
pp. 228080001882225
Author(s):  
Marko Magić ◽  
Božana Čolović ◽  
Saša Vasilijić ◽  
Nenad Tadić ◽  
Stevan Stojadinović ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Cell Attachment ◽  
Titanium Implant ◽  
Ionic Exchange ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
The Given ◽  
Scanning Electron

The titanium implant was treated with plasma electrolytic oxidation and subsequent ionic exchange and thermal treatment in order to obtain bioactive layer consisting of titanium oxide, calcium and sodium titanates and hydroxyapatite, as confirmed by X-ray diffraction (XRD). Scanning electron microscopy (SEM) revealed that the given method, besides corresponding phase composition, enables suitable nanotopology for cell attachment and proliferation. Cytotoxicity investigations by MTT, LDH and propidium iodide assays and light microscopy showed that these coatings were not toxic to L929 cells.

scholarly journals Incorporation of zirconium into PEO coating on Ti6Al4V alloy from acidic electrolyte

2021 ◽  
Vol 8 (6) ◽  
pp. 974-989
Author(s):  
Jie Sun ◽  
◽  
Tzvetanka Boiadjieva-Scherzer ◽  
Hermann Kronberger ◽  
Keyword(s):  
Phase Composition ◽  
Plasma Electrolytic Oxidation ◽  
Ti6al4v Alloy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrolytic Oxidation ◽  
Acidic Electrolyte ◽  
Plasma Electrolytic ◽  
Cu And Zn ◽  
Zr Alloys

<abstract> <p>To imitate the superior biocompatibility of Ti–Zr alloys at reduced cost, conventional Ti6Al4V alloy was modified via plasma electrolytic oxidation (PEO). The influence of different additives on the phase composition and topography was investigated in acidic electrolytes containing Zr(SO<sub>4</sub>)<sub>2</sub>·H<sub>2</sub>O with potentiostatically controlled PEO at different pulse frequencies. Apart from the primary intention to generate Zr enriched phases, formation and incorporation in the ceramic layer of potential antibacterial Cu and Zn species was achieved and examined by X-ray diffraction. The thickness of the oxide layer, the adhesion and the layers' composition were evaluated using FIB and SEM-EDX.</p> </abstract>

Particle Size Influences on the Coating Microstructure through Green Chromia Inclusion in Plasma Electrolytic Oxidation

2017 ◽  
Vol 9 (26) ◽  
pp. 21864-21871 ◽  
Author(s):  
Chen-Yu Liu ◽  
Dah-Shyang Tsai ◽  
Jian-Mao Wang ◽  
James T. J. Tsai ◽  
Chen-Chia Chou
Keyword(s):  
Particle Size ◽  
Plasma Electrolytic Oxidation ◽  
Electrolytic Oxidation ◽  
Coating Microstructure ◽  
Plasma Electrolytic

MICROSTRUCTURE AND WEARING PROPERTIES OF PEO COATINGS: EFFECTS OF Al2O3 AND TiO2

2018 ◽  
Vol 25 (05) ◽  
pp. 1850102 ◽  
Author(s):  
Y. ZHANG ◽  
W. FAN ◽  
H. Q. DU ◽  
Y. W. ZHAO
Keyword(s):  
Photoelectron Spectroscopy ◽  
Plasma Electrolytic Oxidation ◽  
Xps Analysis ◽  
X Ray Diffraction ◽  
Properties Of Coatings ◽  
X Ray ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings ◽  
Scanning Electron

Plasma electrolytic oxidation (PEO) coatings were formed on aluminium alloy in additive Al2O3- and TiO2-containing Na2SiO3-based electrolytes, respectively. The effect of these additives on morphology, composition and wearing properties of coatings was investigated. The morphology and composition of coatings were studied by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). Analysis of wearing properties of coatings were done by friction and wearing experiment. It was found that the use of additives greatly affects the surface morphology of coatings. It is shown that the content of [Formula: see text]-Al2O3 in coatings formed in Al2O3-containing electrolytes increased with the addition of Al2O3. However, the content of [Formula: see text]-Al2O3 in coatings formed in TiO2-containing electrolytes first increased and then decreased. Among these coatings, the coating formed in silicate-based electrolytes system containing 7[Formula: see text]g/L Al2O3 showed the most superior wearing properties.

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.

Influence of the Cathodic Pulse on the Formation and Morphology of Oxide Coatings on Aluminium Produced by Plasma Electrolytic Oxidation / Wpływ Impulsu Katodowego Na Tworzenie I Morfologie Warstw Tlenkowych Na Aluminium Otrzymywanych Na Drodze Plazmowego Utleniania Elektrolitycznego

2013 ◽  
Vol 58 (1) ◽  
pp. 241-245 ◽  
Author(s):  
W. Gebarowski ◽  
S. Pietrzyk
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Density Ratio ◽  
Alternate Current ◽  
Xrd Analysis ◽  
Ceramic Coatings ◽  
Cathodic Current Density ◽  
Cathodic Current ◽  
Cathodic Pulse ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Plasma electrolytic oxidation (PEO) is an effective method to obtain hard ceramic coatings on Al, Mg and Ti alloys. Micro-discharges occurring on the electrode surface during process promote the creation of crystalline oxides phases which improve mechanical properties of the coating. By using alternate current (AC) at some current conditions the process can be conducted in ‘soft’ spark regime. This allows producing thicker layers, increasing growth rate and uniformity of layer, decreasing amount of pores and defects. These facts proof the importance of cathodic pulse in the PEO mechanism; however its role is not well defined. In this work, influence of anodic to cathodic current density ratio on kinetics of coating growth, its morphology and composition were investigated. The PEO process of pure was conducted in potassium hydroxide with sodium metasilicate addition. The different anodic to cathodic average currents densities ratios of pulses were applied. The phase composition of coatings was determined by XRD analysis. Morphology of obtained oxide layers was investigated by SEM observations.

scholarly journals Microstructural and Corrosion Properties of Hydroxyapatite Containing PEO Coating Produced on AZ31 Mg Alloy

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1531
Author(s):  
Luca Pezzato ◽  
Katya Brunelli ◽  
Stefano Diodati ◽  
Mirko Pigato ◽  
Massimiliano Bonesso ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Silicon Oxide ◽  
Current Mode ◽  
Xrd Analysis ◽  
Az31 Alloy ◽  
Corrosion Properties ◽  
Short Treatment ◽  
Treated Sample ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

In this work, the composition of an electrolyte was selected and optimized to induce the formation of hydroxyapatite during Plasma electrolytic oxidation (PEO) treatment on an AZ31 alloy for application in bioabsorbable implants. In detail, the PEO process, called PEO-BIO (Plasma Electrolytic Oxidation-Biocompatible), was performed using a silicate-phosphate-based electrolyte with the addition of calcium oxide in direct-current mode using high current densities and short treatment times. For comparison, a known PEO process for producing anticorrosive coatings, called standard, was applied on the same alloy. The coatings were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and XPS analyses. The corrosion performance was evaluated in simulated body fluid (SBF) at 37 °C. The coating produced on the PEO-BIO sample was porous and thicker than the standard PEO one, with zones enriched in Ca and P. The XRD analysis showed the formation of hydroxyapatite and calcium oxides in addition to magnesium-silicon oxide and magnesium oxide in the PEO-BIO sample. The corrosion resistance of PEO-BIO sample was comparable with that of a traditional PEO treated sample, and higher than that of the untreated alloy.

scholarly journals Microstructure and phase composition of surface layers formed on aluminium alloys by plasma electrolytic oxidation

2020 ◽  
Vol 30 (1) ◽  
pp. 1-6
Author(s):  
Maria-Magdalena DICU ◽  
◽  
Paul-Costinel DICU
Keyword(s):  
Aluminium Alloys ◽  
Plasma Electrolytic Oxidation ◽  
Sodium Metasilicate ◽  
X Ray Diffraction ◽  
Surface Layers ◽  
X Ray ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Xrd Techniques

This paper presents elaboration and structural characterization of surface layers formed on aluminumalloys by plasma electrolytic oxidation (PEO). The electrolyte is a mixture consisting: sodium metasilicate and sodium hydroxide. The coatings obtained by PEO were investigated with: scanning electron microscopy (SEM) with Energy dispersive X-ray spectrometer (EDX) and X-ray diffraction (XRD)techniques.

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