Deposition and evaluation of duplex hydroxyapatite and plasma electrolytic oxidation coatings on magnesium

Yonghao Gao; Aleksey Yerokhin; Allan Matthews

doi:10.1016/j.surfcoat.2015.01.030

Deposition and evaluation of duplex hydroxyapatite and plasma electrolytic oxidation coatings on magnesium

Yonghao Gao, Aleksey Yerokhin, Allan Matthews

Materials Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Multifunctional hydroxyapatite (HA)-magnesia coatings were formed on Mg by plasma electrolytic oxidation (PEO) followed by cathodic electrodeposition. The coating corrosion performance was evaluated in-vitro by potentiodynamic polarisation and electrochemical impedance spectroscopy. Exposure to the physiological environment increased Ca/P ratio of the single PEO coating and decreased it for the duplex HA-PEO coating. Corrosion resistance of Mg was improved by the PEO coating and further enhanced by the HA layer. Corrosion pits were observed after the tests on both coatings. The proposed corrosion mechanism includes electrolyte penetration, coating chemical dissolution and anodic dissolution of Mg.

Original language	English
Pages (from-to)	170-182
Number of pages	13
Journal	Surface and Coatings Technology
Volume	269
Issue number	1
DOIs	https://doi.org/10.1016/j.surfcoat.2015.01.030
Publication status	Published - 1 Jan 2015

Keywords

Cathodic electrodeposition
Corrosion resistance
Electrochemical impedance spectroscopy
Hydroxyapatite
Magnesium
Plasma electrolytic oxidation

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10.1016/j.surfcoat.2015.01.030

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abstract = "Multifunctional hydroxyapatite (HA)-magnesia coatings were formed on Mg by plasma electrolytic oxidation (PEO) followed by cathodic electrodeposition. The coating corrosion performance was evaluated in-vitro by potentiodynamic polarisation and electrochemical impedance spectroscopy. Exposure to the physiological environment increased Ca/P ratio of the single PEO coating and decreased it for the duplex HA-PEO coating. Corrosion resistance of Mg was improved by the PEO coating and further enhanced by the HA layer. Corrosion pits were observed after the tests on both coatings. The proposed corrosion mechanism includes electrolyte penetration, coating chemical dissolution and anodic dissolution of Mg.",

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AU - Gao, Yonghao

AU - Yerokhin, Aleksey

AU - Matthews, Allan

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Y1 - 2015/1/1

N2 - Multifunctional hydroxyapatite (HA)-magnesia coatings were formed on Mg by plasma electrolytic oxidation (PEO) followed by cathodic electrodeposition. The coating corrosion performance was evaluated in-vitro by potentiodynamic polarisation and electrochemical impedance spectroscopy. Exposure to the physiological environment increased Ca/P ratio of the single PEO coating and decreased it for the duplex HA-PEO coating. Corrosion resistance of Mg was improved by the PEO coating and further enhanced by the HA layer. Corrosion pits were observed after the tests on both coatings. The proposed corrosion mechanism includes electrolyte penetration, coating chemical dissolution and anodic dissolution of Mg.

AB - Multifunctional hydroxyapatite (HA)-magnesia coatings were formed on Mg by plasma electrolytic oxidation (PEO) followed by cathodic electrodeposition. The coating corrosion performance was evaluated in-vitro by potentiodynamic polarisation and electrochemical impedance spectroscopy. Exposure to the physiological environment increased Ca/P ratio of the single PEO coating and decreased it for the duplex HA-PEO coating. Corrosion resistance of Mg was improved by the PEO coating and further enhanced by the HA layer. Corrosion pits were observed after the tests on both coatings. The proposed corrosion mechanism includes electrolyte penetration, coating chemical dissolution and anodic dissolution of Mg.

KW - Cathodic electrodeposition

KW - Corrosion resistance

KW - Electrochemical impedance spectroscopy

KW - Hydroxyapatite

KW - Magnesium

KW - Plasma electrolytic oxidation

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VL - 269

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EP - 182

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

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Deposition and evaluation of duplex hydroxyapatite and plasma electrolytic oxidation coatings on magnesium

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