Plasma electrolytic deposition of α-Al2O3 on TiNb fibres and their mechanical properties

Discovered in 1930, metal processing by electrolysis processes in aqueous solutions, are being intensely studied starting with 1960, so that now they have a wide diversity and industrial applicability. The present paper illustrates some theoretical considerations regarding specific electrode processes of the aqueous solutions electrolysis and the I=f (U) characteristics of the Me/VGS/E electrochemical system thus establishing the forming conditions of electrolytic plasma (PE). The continuous and stable character of the deposited layer (VGS) and of the shell formed by the electrolytic plasma will contribute to the rapid heating of the metal electrode, under the influence of the three heat flows qa, ql and qs. Plasma electrolytic saturation phenomena (PES) and the formation of oxides on the metal surface (PEO), represent the two main directions of plasma electrolytic deposition (PED).

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Preparation of Mn doped Al2O3 heat-dissipating coatings on titanium alloy by cathodic plasma electrolytic deposition

Vacuum ◽

10.1016/j.vacuum.2018.10.019 ◽

2019 ◽

Vol 159 ◽

pp. 228-234 ◽

Cited By ~ 4

Author(s):

Zhikai Liu ◽

Qiu Sun ◽

Ying Song ◽

Hairui Wang ◽

Xiangqun Chen ◽

...

Keyword(s):

Titanium Alloy ◽

Electrolytic Deposition ◽

Cathodic Plasma ◽

Plasma Electrolytic ◽

Mn Doped

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Effect of Duty Cycle on Properties of Al2O3 Ceramic Coatings Fabricated on TiAl Alloy via Cathodic Plasma Electrolytic Deposition

Materials ◽

10.3390/ma11101962 ◽

2018 ◽

Vol 11 (10) ◽

pp. 1962 ◽

Cited By ~ 1

Author(s):

Shaoqing Wang ◽

Faqin Xie ◽

Xiangqing Wu ◽

Jixiang An

Keyword(s):

Electron Microscopy ◽

Wear Resistance ◽

Heat Resistance ◽

Duty Cycle ◽

Tial Alloy ◽

Ceramic Coatings ◽

Electrolytic Deposition ◽

Al2o3 Ceramic ◽

Cathodic Plasma ◽

Plasma Electrolytic

In order to study the effect of duty cycle during the cathodic plasma electrolytic deposition (CPED) process, Al2O3 ceramic coatings were fabricated via the CPED technique on prepared TiAl alloy in an Al(NO3)3 electrolyte with different duty cycles. Microstructure, morphology, and chemical compositions of coatings were analyzed by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The mechanical properties, such as thickness, hardness, and binding strength, were also characterized, and heat-resistance and wear-resistance tested. The results indicated that duty cycle mainly affected the relative crystallinity of CPED coatings. As the duty cycle increased, the crystallinity of CPED coatings increased, the content of Al(OH)3 and γ-Al2O3 decreased, and the content of α-Al2O3 increased. The thickness and bonding strength both increased firstly and then decreased, while hardness increased as duty cycle increased. Heat-resistance and wear-resistance of TiAl alloy with CPED coating was highly improved compared to that of TiAl alloy substrate without CPED coating.

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The influence of residual thermal stresses on the mechanical properties of multilayer α-Al2O3/TiCxN1−x coatings on WC/Co cutting tools

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2012.07.088 ◽

2013 ◽

Vol 215 ◽

pp. 119-126 ◽

Cited By ~ 16

Author(s):

Harry Chien ◽

Carlos Diaz-Jimenez ◽

Gregory S. Rohrer ◽

Zhigang Ban ◽

Paul Prichard ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Stresses ◽

Cutting Tools ◽

Α Al2o3

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Protective and strengthening coatings on reinforcing steels

Metaloznavstvo ta obrobka metalìv ◽

10.15407/mom2020.04.039 ◽

2020 ◽

Vol 96 (4) ◽

pp. 39-46

Author(s):

S.A. Vodennikov ◽

◽

V.O. Skachkov ◽

O.S. Vodennikova ◽

◽

...

Keyword(s):

Mechanical Properties ◽

Corrosion Resistance ◽

Electrochemical Oxidation ◽

Mechanical Characteristics ◽

Aluminide Coating ◽

Structural Phase ◽

Phase Changes ◽

Electrolytic Deposition ◽

Reinforcing Steel ◽

Aluminum Coatings

A conceptually new technology for the application of aluminum coatings on 18G2C steel by the electrolytically deposited NaF-NaCl - AlF3 ionic melt method has been developed. To solve the tasks set in the work, a set of experimental and computational research methods was used: metallographic analysis, energy dispersion microanalysis, mechanical tests, and calculation of the oxidation rate of samples. The mechanical characteristics of the samples of reinforcing steel were determined on a rupture machine FP-100 at an active capture rate of 2.5 mm / min. The relationship between the rates of electrochemical oxidation of the aluminide coating, its mechanical properties, with the distribution of aluminum in the depth of the samples and its phase composition have been determined. The increase of mechanical characteristics of samples from 18G2S steel with an aluminum covering in comparison with usual reinforcing steel is shown. The sequence of structural-phase changes of metal in the process of aluminide coating is determined and its influence on mechanical and corrosion resistance is determined. Experimental evaluation of the rate of oxidation of 18G2C steel samples with aluminum coating under the conditions of sulfuric acid electrolyte at an electric current of 11 to 18 A has been conducted. The developed technology of electrolytic deposition of aluminum has scientific and practical interest for the construction industry. The developed coating makes it possible to increase the mechanical properties of steel by almost 12% and to increase the corrosion resistance. Keywords: aluminum coatings, 18G2C steel, electrochemical oxidation, electrolytic deposition.

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