Diagnostics of the thickness of a plasma electrolytic oxidation coating on a nanostructured Mg-Sr alloy

2nd International Conference on New Material and Chemical Industry

材料科学;化学工业

Mukaeva, V.R.^1 ; Kulyasova, O.B.^2 ; Farrakhov, R.G.^1 ; Parfenov, E.V.^1,3 ; Zheng, Y.F.^4

Department of Theoretical Basis of Electrical Engineering, Ufa State Aviation Technical University, 12 Karl Marx Street, Ufa

450008, Russia^1

Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 Karl Marx Street, Ufa

450008, Russia^2

Academy of Sciences of Republic of Bashkortostan, 15 Kirov Street, Ufa, Russia^3

College of Engineering, Peking University, 5 Yi-He-Yuan Road, Beijing, China^4

关键词: Coarse-grained structure;    Coating process;    Electrical transients;    High pressure torsions;    Nano-structured;    Plasma electrolytic oxidation;    Plasma electrolytic oxidation coatings;    Unipolar voltage pulse;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/292/1/012067/pdf
DOI  :  10.1088/1757-899X/292/1/012067

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This study is focused on the development of a method for controlling the thickness of a plasma electrolytic oxidation (PEO) coating on a new nanostructured Mg-2wt%Sr alloy. The process of high pressure torsion of a solution-treated Mg-2wt%Sr magnesium alloy was investigated. A significant reduction in the grain size to 500 nm was attained. The PEO coating process on the new nanostructured Mg-2wt%Sr alloy was studied. The produced coating was compared with a PEO coating with a coarse-grained structure. The waveforms of unipolar voltage pulses of a power source were studied, and electrical transients that can be described by an exponential of the second order were revealed. The relationship between the time constant of the electrical transient exponent and the thickness of the PEO coating was justified. A method for estimating the thickness of the PEO coating on the surface of the Mg-2wt%Sr alloy in terms of the parameters of the electric transient was proposed.