Composite coatings formed using plasma electrolytic oxidation and fluoroparaffin materials

2018 ◽  
Vol 767 ◽  
pp. 353-360 ◽  
Author(s):  
D.V. Mashtalyar ◽  
S.V. Gnedenkov ◽  
S.L. Sinebryukhov ◽  
I.M. Imshinetskiy ◽  
A.S. Gnedenkov ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Composite Coatings ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Inhibitor-Containing Composite Coatings on Mg Alloys: Corrosion Mechanism and Self-Healing Protection

2015 ◽  
Vol 245 ◽  
pp. 89-96 ◽  
Author(s):  
Andrey S. Gnedenkov ◽  
Sergey L. Sinebryukhov ◽  
Dmitry V. Mashtalyar ◽  
Sergey V. Gnedenkov
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Composite Coatings ◽  
Healing Process ◽  
Corrosion Mechanism ◽  
Self Healing ◽  
Protective Properties ◽  
Oxidation Method ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Electrode Technique

The way of self-healing coating formation at the surface of magnesium alloys by means of plasma electrolytic oxidation method (PEO) with subsequent filling of the obtained layer with inhibitor has been suggested. The electrochemical properties of such coatings have been described in details. The obtained experimental results indicate that the protective properties of the samples with inhibitor-containing coating were increased (IC = 8.6×10–8 A/cm2) in comparison with the samples without coating (5.3×10–5 A/cm2) and the base coating obtained by plasma electrolytic oxidation method (PEO) (3.4×10–7 A/cm2). The local scanning electrochemical methods of surface investigation, notably Scanning Vibrating Electrode Technique (SVET) and Scanning Ion-Selective Electrode Technique (SIET) were used for determining the kinetics and mechanism of the self-healing process. The treatment by the solution containing 8-hydroxyquinoline, which inhibits the corrosion process, enables one to increase the protective properties of the composite coating in 30 times in the corrosion-active environment in comparison with the base PEO-coating and avert the intensive destruction of the material.

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.

TEM Analysis and Corrosion Resistance of the Ceramic Coatings on Q235 Steel Prepared by Hybrid Method of Hot-Dipping Aluminum and Plasma Electrolytic Oxidation

2012 ◽  
Vol 152-154 ◽  
pp. 40-45
Author(s):  
Li Hong Lu ◽  
De Jiu Shen ◽  
Jing Wu Zhang ◽  
Chang Hong Guo
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
Hybrid Method ◽  
Plasma Electrolytic Oxidation ◽  
Sea Water ◽  
Composite Coatings ◽  
Ceramic Coatings ◽  
Q235 Steel ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

The hybrid method of plasma electrolytic oxidation (PEO) and hot-dipping aluminum (HDA) was employed to deposit composite ceramic coatings on the surface of Q235 steel. The cross-section microstructure and surface morphology of the treated specimens were investigated with scanning electron microscopy (SEM). Especially, the composition of the composite coatings was investigated with transmission electron microscopy (TEM). The corrosion resistance was analyzed by immersing and corrosion polarizing experiments. The results indicate that metallurgical bonding can be observed between the ceramic coatings and the steel substrate. There are many micro-pores which act as discharge channels in the PEO coatings. The phase composition of the ceramic coatings is mainly composed of amorphous phase and crystal Al2O3 oxides. The crystal Al2O3 phase includes κ- Al2O3, θ- Al2O3 and β- Al2O3.The corrosion resistance of the PEO samples is much better than that of the HDA samples whether immersed in the NaCl solution or in the sea water.

Formation of composite coatings by plasma electrolytic oxidation using telomeric solution in pentafluorchlorbenzene

2017 ◽  
pp. 65-70
Author(s):  
S. V. Gnedenkov ◽  
◽  
S. L. Sinebryukhov ◽  
D. V. Mashtalyar ◽  
K. V. Nadaraia ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Composite Coatings ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic
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