scholarly journals Cathodic nitriding and anodic polishing of Ti6Al4V alloy by plasma electrolysis

2021 ◽  
Vol 2144 (1) ◽  
pp. 012033
Author(s):  
I V Tambovskiy ◽  
R A Vdovichenko ◽  
R D Belov ◽  
A D Dyakonova ◽  
R V Nikiforov ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Combined Treatment ◽  
Ti6al4v Alloy ◽  
Surface Microhardness ◽  
Plasma Electrolysis ◽  
Ringer’S Solution ◽  
Ti6al4v Titanium Alloy ◽  
Modified Layer ◽  
Plasma Electrolytic

Abstract The paper presents the results of studies on modifying the surface of Ti6Al4V titanium alloy by combined exposure to cathodic nitriding and anodic polishing in electrolysis plasma. The morphology and roughness of the surface, microhardness of the modified layer have been investigated. Wear resistance was studied under dry friction conditions. The effect of combined treatment on corrosion resistance of Ti6Al4V alloy was examined by means of potentiodynamic polarization in Ringer’s solution. It has been established that cathodic nitriding at 750 °C for 10 min leads to the hardening of the surface layer up to 820 HV with an increase in roughness by 2 times and wear resistance almost 3 times. Subsequent anodic plasma electrolytic polishing of the nitriding surface in solution of ammonium sulfate leads to a decrease in roughness and friction coefficient with an increase in corrosion resistance.

scholarly journals Cathodic boriding and anodic polishing of medium-carbon steel by plasma electrolysis

2021 ◽  
Vol 2144 (1) ◽  
pp. 012027
Author(s):  
S S Korableva ◽  
I R Palenov ◽  
I M Naumov ◽  
A A Smirnov ◽  
I A Kusmanova ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Carbon Steel ◽  
Sulfate Solution ◽  
Medium Carbon Steel ◽  
Operating Voltage ◽  
Medium Carbon ◽  
Plasma Electrolysis ◽  
Electrolytic Polishing ◽  
Cathodic Plasma ◽  
Plasma Electrolytic

Abstract The possibility of cathodic plasma electrolytic boriding of medium-carbon steel in an aqueous solution of ammonium chloride and boric acid followed by anodic plasma electrolytic polishing in an ammonium sulfate solution on the same equipment with a change in the operating voltage is shown. The morphology and roughness of the surface, microhardness of the modified layer have been investigated. Wear resistance was studied under dry friction conditions. It has been established that cathodic boriding at 850 °C for 5–30 min leads to the hardening of the surface layer up to 1050 HV with an increase in roughness by 1.5–2.5 times and wear resistance by 3.5 times. Subsequent anodic plasma electrolytic polishing of the boriding surface leads to a decrease in roughness with an increase in wear resistance by 2.3 times.

scholarly journals Corrosion Resistance and Surface Bioactivity of Ti6Al4V Alloy after Finish Turning under Ecological Cutting Conditions

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6917
Author(s):  
Kamil Leksycki ◽  
Agnieszka Kaczmarek-Pawelska ◽  
Kamil Ochał ◽  
Andrzej Gradzik ◽  
Danil Yurievich Pimenov ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Electrochemical Impedance ◽  
Ti6al4v Alloy ◽  
Cutting Conditions ◽  
Practical Significance ◽  
Molar Ratio ◽  
Finish Turning ◽  
Ti6al4v Titanium Alloy

The influence of cooling conditions and surface topography after finish turning of Ti6Al4V titanium alloy on corrosion resistance and surface bioactivity was analyzed. The samples were machined under dry and minimum quantity lubrication (MQL) conditions to obtain different surface roughness. The surface topographies of the processed samples were assessed and measured using an optical profilometer. The produced samples were subjected to electrochemical impedance spectroscopy (EIS) and corrosion potential tests (Ecorr) in the presence of simulated body fluid (SBF). The surface bioactivity of the samples was assessed on the basis of images from scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) analysis. The inspection of the surfaces of samples after turning under dry and MQL conditions revealed unevenly distributed precipitation of hydroxyapatite compounds (Ca/P) with a molar ratio in the range of 1.73–1.97. Regardless of the cutting conditions and surface roughness, the highest values of Ecorr ~0 mV were recorded on day 7 of immersion in the SBF solution. The impedance characteristics showed that, compared to the MQL conditions, surfaces machined under dry conditions were characterized by greater resistance and the presence of a passive layer on the processed surface. The main novelty of the paper is the study of the effect of ecological machining conditions, namely, dry and MQL cutting on the corrosion resistance and surface bioactivity of Ti6Al4V titanium alloy after finish turning. The obtained research results have practical significance. They can be used by engineers during the development of technological processes for medical devices made of Ti6Al4V alloy to obtain favorable functional properties of these devices.

scholarly journals CHARACTERIZATION OF NITROCARBURIZED COATING BY PLASMA ELECTROLYTIC SATURATION

2018 ◽  
Vol 24 (1) ◽  
pp. 20 ◽  
Author(s):  
Seyyed Mohammad Noori ◽  
Changiz Dehghanian
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Plasma Deposition ◽  
Surface Hardness ◽  
Atmospheric Pressure Plasma ◽  
Work Piece ◽  
Aisi 1045 Steel ◽  
Plasma Electrolytic ◽  
1045 Steel

<p class="AMSmaintext">Plasma electrolytic saturation (PES) is an atmospheric pressure plasma deposition which is used for fabrication of nanostructural coatings. This process starts with the appearance of some sparks on the surface and finally by the formation of plasma envelope around the sample, particles and free radicals bombard the surface and diffusion takes place into the work-piece. In this paper, the effect of frequency (500, 1000 and 10000 Hz) as pulse parameters on properties of nitrocarburized layers deposited on AISI 1045 steel were investigated. The analytical characteristics of the coating were assessed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The corrosion behavior of coatings was analyzed by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in 3.5% sodium chloride solution. Moreover, the microhardness and wear resistance of coated samples were also studied. The results indicated that applying nitrocarburized layer in all cases, improved the corrosion resistance, microhardness and also wear resistance of the substrate. The coatings treated at the frequency of 10000 Hz, had corrosion resistance about 2.4 and 1.4 times higher than those of the samples prepared at the frequency of 500 Hz and 1000 Hz. The surface hardness of 10000 Hz treated sample was about 1040 Vickers, which was more than those of the two other ones. An increase in frequency also caused wear resistance to increase. </p>

Characterization of Pure Titanium and Ti6Al4V Alloy Modified by Plasma Electrolytic Carbonitriding Process

2012 ◽  
Vol 522 ◽  
pp. 152-155 ◽  
Author(s):  
Xin Mei Li ◽  
Xiao Feng Dong ◽  
Tu Erxun Si Dike ◽  
Kai Jie Li ◽  
Dong Yu
Keyword(s):  
Diffusion Layer ◽  
Pure Titanium ◽  
Titanium Substrate ◽  
Ti6al4v Alloy ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Modified Layer ◽  
Plasma Electrolytic

Porous nanocrystalline thick Ti (CxN1-x) films which bond firmly to the substrate are obtained on commercially pure titanium and Ti6Al4V alloy by plasma electrolytic carbonitriding (PECN) treatment. The microstructures and compositions of the modified layer on different substrates were compared. The results showed that the modified layer is composed of the outer Ti (CxN1-x) film and the diffusion layer. When discharge-treated for 150 min, the thickness of the Ti (CxN1-x) film is ~15μm, irrespective of the different substrate. The TiH2 riched diffusion layer which is 40-45μm thick is located beneath the Ti (CxN1-x) film for the pure titanium substrate, while for Ti6Al4V alloy it is the β-Ti-riched layer which is ~100 μm thick.

scholarly journals The effect of process current parameters on the properties of oxide layers under plasma electrolytic oxidation of AMg6 alloy

2021 ◽  
Vol 2144 (1) ◽  
pp. 012018
Author(s):  
A V Polunin ◽  
A G Denisova ◽  
A O Cheretaeva ◽  
M R Shafeev ◽  
E D Borgardt ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Plasma Electrolytic Oxidation ◽  
Oxide Layers ◽  
Positive Pulse ◽  
Pulse Ratio ◽  
Wear And Corrosion ◽  
Electrolytic Oxidation ◽  
Wear And Corrosion Resistance ◽  
Plasma Electrolytic

Abstract The effect of current density and current ratio in the cathodic and anodic half-cycles during prolonged (180 minutes) plasma electrolytic oxidation (PEO) of AMg6 wrought alloy on the oxide layer wear and corrosion resistance were studied. It was established that the best wear resistance is achieved in the oxide layers obtained in the “soft sparking” mode (negative-to-positive pulse ratios of 1.15–1.30) at current densities of 9–15 A dm−2, and the best set of wear resistance and corrosion resistance – in the oxide layers obtained in “symmetrical” mode (negative-to-positive pulse ratio of 1.00).

scholarly journals Influence of plasma electrolytic hardening modes on the structure and properties of 65G steel

2021 ◽  
Vol 5 (3) ◽  
pp. 209-221
Author(s):  
B.K. Rakhadilov ◽  
R.S. Kozhanova ◽  
D. Baizhan ◽  
L.G. Zhurerova ◽  
G.U. Yerbolatova ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Steel Surface ◽  
Economic Effects ◽  
Structure And Properties ◽  
Laboratory Installation ◽  
Plasma Hardening ◽  
Study Results ◽  
Modified Layer ◽  
Plasma Electrolytic ◽  
Local Hardening

This work presented a study of the structure, hardness and wear resistance of 65G steel treated with electrolyte-plasma hardening under different conditions. The electrolyte-plasma hardening technology and a laboratory installation for the realisation of electrolyte-plasma hardening are also described. After electrolyte-plasma hardening, we have established that a modified layer consists of the a-phase (martensite) and M3C cementite. The study results showed that electrolyte-plasma hardening makes it possible to obtain layers on the 65G steel surface that provides an increase in microhardness by 2.6 times, wear resistance by two times, resistance to abrasive wear by 1.7 times compared to the original samples. In addition, local hardening ensures the achievement of technical and economic effects due to the absence of the need to isolate an unwanted site of parts, processing only the areas requiring hardening.

Microstructure and Mechanical Properties of 40CrNiMo7 Steel after High Current Pulsed Electron Beam Treatment

2013 ◽  
Vol 423-426 ◽  
pp. 276-280
Author(s):  
Hui Hui Wang ◽  
Sheng Zhi Hao
Keyword(s):  
Wear Resistance ◽  
Electron Beam ◽  
High Current ◽  
X Ray Diffraction ◽  
Surface Microhardness ◽  
Initial State ◽  
X Ray ◽  
Pulsed Electron Beam ◽  
Modified Surface ◽  
Modified Layer

High current pulsed electron beam (HCPEB) treatment was conducted on 40CrNiMo7 steel. The surface microstructure was characterized by metalloscopy and X-ray diffraction methods. The microhardness and wear resistance of modified surface were measured. After the HCPEB treatment, the surface crater structure was observed due to the inhomogeneity of initial material. A modified layer of depth ~ 7 μm was formed with a hybrid microstructure composed mainly of martensite and a small quantity of austenite. The surface microhardness of HCPEB modified sample was increased drastically to more than 1000 HK. The wear resistance increased by about 36% as compared to the initial state.

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