High growth rate, wear resistant coatings on an Al–Cu–Li alloy by plasma electrolytic oxidation in concentrated aluminate electrolytes

2015 ◽  
Vol 269 ◽  
pp. 74-82 ◽  
Author(s):  
Ying-liang Cheng ◽  
Jin-hui Cao ◽  
Mo-ke Mao ◽  
Zhao-mei Peng ◽  
P. Skeldon ◽  
...  
Keyword(s):  
Growth Rate ◽  
Plasma Electrolytic Oxidation ◽  
High Growth ◽  
High Growth Rate ◽  
Wear Resistant ◽  
Wear Resistant Coatings ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

The Mechanism of PEO Process on Al–Si Alloys in Zirconate Solution

2012 ◽  
Vol 479-481 ◽  
pp. 178-181
Author(s):  
Ping Wang ◽  
Dao Xin Liu ◽  
Jian Ping Li ◽  
Yong Chun Guo ◽  
Zhong Yang
Keyword(s):  
Growth Rate ◽  
Plasma Electrolytic Oxidation ◽  
Plasma Discharge ◽  
Alkaline Electrolyte ◽  
Zirconia Coating ◽  
Micro Particles ◽  
Composition And Structure ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Electric Field Force

Zirconia coating was produced on Al-Si alloys by plasma electrolytic oxidation (PEO). The alkaline electrolyte containing Zr(OH)4 powders was used. The composition and structure of the coating were investigated by SEM and XRD. The results show that in the initial stages of oxidation the growth of coating belongs to the stage of anodic oxidation controlled by electrochemical polarization. The growth of coating is mainly outward growth and the growth rate is faster. With elongated treated time and increased thickness of the coating, the growth of coating is mainly ingrowth. In contrast with the stage of anodization, the growth rate of plasma electrolytic oxidation is slower than anodization. The coating consists of t-ZrO2, m-ZrO2, α-Al2O3 and γ-Al2O3.T-ZrO2 is the main phase and distributes in outer layer of the coating, however, α-Al2O3 appears in inner layer of the coating. Many micro-particles appear on the coating surface with dimension of 1-2μm.. In the process of plasma electrolytic oxidation, Zr(OH)4 powders move and deposit on the mouth of plasma discharge channel under the effect of electric field force, then it is transformed to ZrO2 by the high temperature of plasma discharge.

Kinetic features of wear-resistant coating growth by plasma electrolytic oxidation

2018 ◽  
Vol 6 (3) ◽  
pp. 150-158 ◽  
Author(s):  
Satish Tailor ◽  
Alexander G Rakoch ◽  
Alexandra A Gladkova ◽  
Phan Van Truong ◽  
Daria M Strekalina ◽  
...  
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Wear Resistant Coating ◽  
Wear Resistant ◽  
Resistant Coating ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Coating Growth ◽  
Kinetic Features

scholarly journals INFLUENCE OF PLASMA-ELECTROLYTIC OXIDATION PROCESS TECHNOLOGICAL PARAMETERS OF ALUMINUM ON COATING GROWTH RATE

2021 ◽  
pp. 165-178
Author(s):  
V. M. Posuvailo ◽  
V. V. Vytvytskiy ◽  
M. M. Romaniv ◽  
T. O. Pryhorovska
Keyword(s):  
Growth Rate ◽  
Plasma Electrolytic Oxidation ◽  
Oxide Coating ◽  
Electrical Parameters ◽  
Technological Parameters ◽  
Electrolytic Oxidation ◽  
Electrolyte Component ◽  
Coating Synthesis ◽  
Plasma Electrolytic ◽  
Coating Growth

There has been carried out an analysis of methods of oxide covering formation productivity increasing during plasma electrolytic oxidation of aluminum in electrolyte. There has been developed a technology of blank manufacturing and part strengthening by plasma electrolytic oxidation in the electrolyte, as well as the workbench has been modernized. There has been studied the process of oxidoceramic coating synthesis for the D16T aluminum deformed alloy of during plasma electrolytic oxidation in the electrolyte for different process parameters. It is established that the growth rate of oxidoceramic coating can be significantly increased by electrolyte component concentration involved in aluminum oxidation and rational choice of process electrical parameters. Hydrogen peroxide addition leads to obtained oxoceramic coating thickness increasing due to O, O2, OH, OH– concentration increasing in the electrolyte. It is established that the optimal concentration of H2O2 ranges from 5 g/l to 7 g/l.  A further increase of peroxide concentration leads to a decrease in peroxide effect on oxoceramic coating growth rate on the D16T aluminum deformed alloy due to pH changes of the electrolyte and the deterioration of the oxide coating.

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