Composite fluoropolymer coatings on Mg alloys formed by plasma electrolytic oxidation in combination with electrophoretic deposition

2015 ◽  
Vol 283 ◽  
pp. 347-352 ◽  
Author(s):  
S.V. Gnedenkov ◽  
S.L. Sinebryukhov ◽  
D.V. Mashtalyar ◽  
I.M. Imshinetskiy
Keyword(s):  
Electrophoretic Deposition ◽  
Plasma Electrolytic Oxidation ◽  
Mg Alloys ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

scholarly journals Deposition of hydroxyapatite–incorporated TiO2 coating on titanium using plasma electrolytic oxidation coupled with electrophoretic deposition

RSC Advances ◽  
2016 ◽  
Vol 6 (67) ◽  
pp. 62540-62544 ◽  
Author(s):  
Sviatlana A. Ulasevich ◽  
Anatoly I. Kulak ◽  
Sergey K. Poznyak ◽  
Sergey A. Karpushenkov ◽  
Aleksey D. Lisenkov ◽  
...  
Keyword(s):  
Electrophoretic Deposition ◽  
Plasma Electrolytic Oxidation ◽  
Tio2 Coating ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

K2[TiO(C2O4)2] is decomposed by micro-arcs on the anode producing TiO2 while hydroxyapatite particles are incorporated into TiO2 coating during electrophoretic deposition.

Electrophoretic Composite Coatings on Magnesium Alloys

2015 ◽  
Vol 245 ◽  
pp. 97-102
Author(s):  
Dmitry V. Mashtalyar ◽  
Sergey V. Gnedenkov ◽  
Sergey L. Sinebryukhov ◽  
Igor M. Imshinetsky
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Electrophoretic Deposition ◽  
Plasma Electrolytic Oxidation ◽  
Corrosion Current Density ◽  
Composite Coatings ◽  
Corrosion Current ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Investigation results of the composite coatings obtained on MA8 magnesium alloy by plasma electrolytic oxidation (PEO) and post-treated by electrophoretic deposition of superdispersed polytetrafluoroethylene (SPTFE) are presented. Comprehensive research of electrochemical and mechanical properties of the obtained polymer-containing coatings on the magnesium alloy has been performed. It has been established that composite coatings to decrease the corrosion current density by three orders of magnitude (down to Ic = 2.0×10-10 A/cm2) and the wear by two orders of magnitude (down to 1.2×10-6 mm3/(N·m)), as compared to the basic PEO-coating.

Characterization of Composite Coatings Produced by Plasma Electrolytic Oxidation Plus Cathodic Electrophoretic Deposition on Magnesium Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 1126-1131
Author(s):  
Yong Feng Jiang ◽  
Hua Shan Yang ◽  
Ye Feng Bao ◽  
Ying Yue Zhang
Keyword(s):  
Magnesium Alloy ◽  
Electrophoretic Deposition ◽  
Plasma Electrolytic Oxidation ◽  
Composite Coatings ◽  
Salt Spray ◽  
Immersion Test ◽  
Organic Layer ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

The composite coatings were prepared on AZ91D magnesium alloy by plasma electrolytic oxidation (PEO) plus cathodic electrophoretic deposition (E-coat) to improve corrosion protection. SEM observation revealed that the organic layer was integrated with PEO film by physically interlocking; Potentiodynamic polarization(E-i) measurements in 3.5% NaCl solution, copper accelerated acetate salt spray(CASS) test and immersion test were employed to evaluate corrosion principle and corrosion rate of composite coatings. It is indicated that the corrosion resistance of composite coatings was improved obviously compared to the PEO film. There is no noticeable pitting corrosion on the composite coatings after 320h CASS test. The adhesion of composite coatings was evaluated by cross-cut and pull-off test. The results show that adhesion of composite coatings can reach to level 0 and 11.3 N/mm2 as a result of the blocking effect between organic layer and PEO film.

Characterization of Nickel Oxide Layers on the AZ91 Mg Alloys by Plasma Electrolytic Oxidation

2010 ◽  
Vol 654-656 ◽  
pp. 775-778 ◽  
Author(s):  
In Jun Hwang ◽  
Kang Min Lee ◽  
Bong Young Yoo ◽  
Dong Hyuk Shin
Keyword(s):  
Nickel Oxide ◽  
Plasma Electrolytic Oxidation ◽  
Mg Alloys ◽  
Process Time ◽  
Nickel Ion ◽  
Present Sample ◽  
Oxide Layers ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Characterization of nickel oxide layers on the AZ91 Mg alloys by plasma electrolytic oxidation (PEO) was investigated. For this purpose, PEO coating was carried out on the present sample in the alkaline electrolyte with nickel ion at three different voltage responses, i.e., 150, 250, 350 V. The amount of nickel oxide increased by increasing process time, and changed the color of sample from light grey to moderate olive brown. It was observed from potentio-dynamic polarization analysis that polarization resistance of oxide layer was increased with increasing nickel ions. Also microhardness of the sample processed at 350 V was higher than those of the samples.

Structure and corrosion resistance of ZrO2 ceramic coatings on AZ91D Mg alloys by plasma electrolytic oxidation

2011 ◽  
Vol 509 (33) ◽  
pp. 8469-8474 ◽  
Author(s):  
Zhongping Yao ◽  
Yongjun Xu ◽  
Yunfu Liu ◽  
Dali Wang ◽  
Zhaohua Jiang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Plasma Electrolytic Oxidation ◽  
Ceramic Coatings ◽  
Mg Alloys ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

scholarly journals Improving the Corrosion Behavior of Biodegradable AM60 Alloy through Plasma Electrolytic Oxidation

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 953
Author(s):  
Afraa I. Alateyah ◽  
Talal A. Aljohani ◽  
Majed O. Alawad ◽  
Sally Elkatatny ◽  
Waleed H. El-Garaihy
Keyword(s):  
Corrosion Resistance ◽  
Base Metal ◽  
Plasma Electrolytic Oxidation ◽  
Electrochemical Impedance ◽  
Mg Alloys ◽  
Duty Ratio ◽  
Compression Tests ◽  
Electrical Parameters ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Magnesium (Mg) alloys have unique properties. However, their applications are limited in working environments due to their poor corrosion resistance. Plasma electrolytic oxidation (PEO) is one of the most environmentally friendly and cost-effective ways that has been promoted to treat Mg alloys. In this study, we investigated the effect of electrical parameters on the microstructure, as well as the mechanical and corrosion resistance of AM60 alloy coated with PEO. The electrical parameters studied were current mode (unipolar and bipolar), frequency and duty ratio. The microstructure evolution of the coated AM60 substrates was studied using X-ray diffraction and scanning electron microscopy. Subsequently, the mechanical properties were determined using compression tests and microhardness measurements. The potentiodynamic polarization curves indicated that the PEO-coated samples experienced a significant decrease of 99.9% in the corrosion rate compared to the base metal. The electrochemical impedance spectroscopy findings showed that PEO coating increased the corrosion resistance of the AM60 magnesium alloy by 1071870% compared to the base metal. On the other hand, the PEO coated samples showed superior adhesion to the substrate. Moreover, the PEO coating led to an improvement in the hardness value by 114% compared to base metal, coupled with insignificant change in the compressive properties.

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