Plasma electrolytic oxidation of magnesium by sawtooth pulse current

被引:16
|
作者
Guo, Yue [1 ]
Rogov, Aleksey [1 ,2 ]
Hird, Alexander [1 ]
Mingo, Beatriz [1 ]
Matthews, Allan [1 ]
Yerokhin, Aleksey [1 ]
机构
[1] Univ Manchester, Dept Mat, Oxford Rd, Manchester M13 9PL, Lancs, England
[2] Sci & Tech Ctr Pokrytie A, Novosibirsk 630015, Russia
来源
基金
英国工程与自然科学研究理事会;
关键词
Plasma electrolytic oxidation; Magnesium; Sawtooth pulse current; Current ramp; Defect healing; Corrosion protection; CORROSION BEHAVIOR; PEO COATINGS; CURRENT-MODE; ALLOY; ALUMINUM; IMPEDANCE; SILICATE;
D O I
10.1016/j.surfcoat.2021.127938
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Mg2SiO4 coatings were formed on cp-Mg by Plasma Electrolytic Oxidation (PEO) using electrical regimes based on sawtooth anodic current pulses with extended ascending or descending segments (ramps). Voltage, current and light emission signals were simultaneously acquired to derive and analyse the evolution of system current and discharge population density during PEO process, while optical emission spectroscopy was employed for identification of plasma species. Coating morphological characterisation was carried out using Scanning Electron Microscopy. Phase composition was identified by X-ray diffraction. The corrosion performance was evaluated with Electrochemical Impedance Spectroscopy at various periods of exposure to corrosive media (0.5 wt% NaCl). It was shown that the application of sawtooth pulses allowed the controlling of microdischarge characteristics and coating morphology in both pulsed unipolar and reversed current regimes. Results further demonstrate that the application of anodic sawtooth pulses with the negative ramp facilitated defect healing during coating formation leading to production of more uniform PEO coatings with lower porosity and a slower degradation rate of magnesium substrate. A steady decay in the coating resistance with immersion time provides a possibility for controlling magnesium degradation and thereby for optimisation of component lifetime in applications where predictable Mg dissolution rate is required, such as sacrificial anodic protection of metallic structures and resorbable biomedical implants.
引用
收藏
页数:12
相关论文
共 50 条
  • [1] AC plasma electrolytic oxidation of magnesium with zirconia nanoparticles
    Arrabal, R.
    Matykina, E.
    Viejo, F.
    Skeldon, P.
    Thompson, G. E.
    Merino, M. C.
    [J]. APPLIED SURFACE SCIENCE, 2008, 254 (21) : 6937 - 6942
  • [2] Effects of pulsed current on plasma electrolytic oxidation
    Mann, R.
    Hansal, W. E. G.
    Hansal, S.
    [J]. TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING, 2014, 92 (06): : 297 - 304
  • [3] Anode current effects in plasma electrolytic oxidation
    Wei, C. B.
    Tian, X. B.
    Yang, S. Q.
    Wang, X. B.
    Fu, Ricky K. Y.
    Chu, Paul K.
    [J]. SURFACE & COATINGS TECHNOLOGY, 2007, 201 (9-11): : 5021 - 5024
  • [4] A universal electrolyte for the plasma electrolytic oxidation of aluminum and magnesium alloys
    Kossenko, Alexey
    Zinigrad, Michael
    [J]. MATERIALS & DESIGN, 2015, 88 : 302 - 309
  • [5] The influence of pulse timing and current mode on the microstructure and corrosion behaviour of a plasma electrolytic oxidation (PEO) coated AM60B magnesium alloy
    Hussein, R. O.
    Northwood, D. O.
    Nie, X.
    [J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2012, 541 : 41 - 48
  • [6] Plasma Electrolytic Oxidation and Characterization of Spark Plasma Sintered Magnesium/Hydroxyapatite Composites
    Viswanathan, R.
    Rameshbabu, N.
    Kennedy, S.
    Sreekanth, D.
    Venkateswarlu, K.
    Rani, M. Sandhya
    Muthupandi, V.
    [J]. LIGHT METALS TECHNOLOGY 2013, 2013, 765 : 827 - 831
  • [7] Current density effects on plasma emission during plasma electrolytic oxidation (PEO) on AZ91D-magnesium alloy
    Girase, Krunal
    Wang, Zhenzhen
    Kamimoto, Takahiro
    Deguchi, Yoshihiro
    Jeon, Mingyu
    Cui, Minchao
    Chou, Chen-Chia
    Huang, Eddy
    [J]. MODERN PHYSICS LETTERS B, 2020, 34 (7-9):
  • [8] Effect of the Pulse Duty Cycle on Characteristics of Plasma Electrolytic Oxidation Coatings Formed on AZ31 Magnesium Alloy
    Chen Huan
    Lv Guo-Hua
    Zhang Gu-Ling
    Pang Hua
    Wang Xing-Quan
    Zhang You-Wei
    Lee, Heon-Ju
    Yang Si-Ze
    [J]. CHINESE PHYSICS LETTERS, 2009, 26 (09)
  • [9] Investigation of plasma electrolytic oxidation processes of magnesium alloy MA2-1 under pulse polarisation modes
    Timoshenko, AV
    Magurova, YV
    [J]. SURFACE & COATINGS TECHNOLOGY, 2005, 199 (2-3): : 135 - 140
  • [10] Effects of oxidation time on corrosion resistance of plasma electrolytic oxidation coatings on magnesium alloy
    Zhuang, Junjie
    Song, Renguo
    Xiang, Nan
    Lu, Junpeng
    Xiong, Ying
    [J]. INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, 2017, 108 (09) : 758 - 766