Titania-zinc phosphate/nanocrystalline zinc composite coatings for corrosion protection of biomedical WE43 magnesium alloy

Jingyao Li; Jian Li; Qingyang Li; Haili Zhou; Guomin Wang; Xiang Peng; Weihong Jin; Zhentao Yu; Paul K. Chu; Wei Li

doi:10.1016/j.surfcoat.2021.126940

Titania-zinc phosphate/nanocrystalline zinc composite coatings for corrosion protection of biomedical WE43 magnesium alloy

Jingyao Li, Jian Li, Qingyang Li, Haili Zhou, Guomin Wang, Xiang Peng, Weihong Jin^*, Zhentao Yu, Paul K. Chu^*, Wei Li

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

28 Citations (Scopus)

Abstract

Biodegradable medical implants made of magnesium (Mg) alloys must have sufficient corrosion resistance in clinical applications. Herein, a nanocrystalline zinc (Zn) coating is electrodeposited on the WE43 Mg alloy followed by a chemical conversion treatment to produce a titania-Zn phosphate layer. The Zn coating has a rice-like nanostructure and the conversion layer is composed of ZnO, Zn₃(PO₄)₂, and TiO₂. The Zn coating reduces the corrosion current density of the WE43 Mg alloy from 151.1 ± 13.8 μA cm⁻² to 29.4 ± 7.4 μA cm⁻² in the simulated body fluid (SBF), while the composite coating decreases it to 4.1 ± 0.8 μA cm⁻². The surface morphology, pH variation, and average corrosion rates after immersion for 7 days in SBF reveal that the Zn coating in fact accelerates dissolution of the Mg substrate due to the formation of galvanic couples between the Zn coating and Mg alloy substrate. In comparison, only slight corrosion is observed from limited areas on the sample with the composite coating. The titania-Zn phosphate/nanocrystalline Zn composite coating provides long-term protection in the physiological environment and the protection mechanism is discussed.

Original language	English
Article number	126940
Journal	Surface and Coatings Technology
Volume	410
Online published	4 Feb 2021
DOIs	https://doi.org/10.1016/j.surfcoat.2021.126940
Publication status	Published - 25 Mar 2021

Research Keywords

Biodegradable magnesium alloys
Chemical conversion
Coatings
Corrosion
Nanocrystalline zinc

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10.1016/j.surfcoat.2021.126940

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@article{da16d788e22841209f2a7ac8bdcba4b2,

title = "Titania-zinc phosphate/nanocrystalline zinc composite coatings for corrosion protection of biomedical WE43 magnesium alloy",

abstract = "Biodegradable medical implants made of magnesium (Mg) alloys must have sufficient corrosion resistance in clinical applications. Herein, a nanocrystalline zinc (Zn) coating is electrodeposited on the WE43 Mg alloy followed by a chemical conversion treatment to produce a titania-Zn phosphate layer. The Zn coating has a rice-like nanostructure and the conversion layer is composed of ZnO, Zn3(PO4)2, and TiO2. The Zn coating reduces the corrosion current density of the WE43 Mg alloy from 151.1 ± 13.8 μA cm−2 to 29.4 ± 7.4 μA cm−2 in the simulated body fluid (SBF), while the composite coating decreases it to 4.1 ± 0.8 μA cm−2. The surface morphology, pH variation, and average corrosion rates after immersion for 7 days in SBF reveal that the Zn coating in fact accelerates dissolution of the Mg substrate due to the formation of galvanic couples between the Zn coating and Mg alloy substrate. In comparison, only slight corrosion is observed from limited areas on the sample with the composite coating. The titania-Zn phosphate/nanocrystalline Zn composite coating provides long-term protection in the physiological environment and the protection mechanism is discussed.",

keywords = "Biodegradable magnesium alloys, Chemical conversion, Coatings, Corrosion, Nanocrystalline zinc",

author = "Jingyao Li and Jian Li and Qingyang Li and Haili Zhou and Guomin Wang and Xiang Peng and Weihong Jin and Zhentao Yu and Chu, {Paul K.} and Wei Li",

year = "2021",

month = mar,

day = "25",

doi = "10.1016/j.surfcoat.2021.126940",

language = "English",

volume = "410",

journal = "Surface and Coatings Technology",

issn = "0257-8972",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Titania-zinc phosphate/nanocrystalline zinc composite coatings for corrosion protection of biomedical WE43 magnesium alloy

AU - Li, Jingyao

AU - Li, Jian

AU - Li, Qingyang

AU - Zhou, Haili

AU - Wang, Guomin

AU - Peng, Xiang

AU - Jin, Weihong

AU - Yu, Zhentao

AU - Chu, Paul K.

AU - Li, Wei

PY - 2021/3/25

Y1 - 2021/3/25

N2 - Biodegradable medical implants made of magnesium (Mg) alloys must have sufficient corrosion resistance in clinical applications. Herein, a nanocrystalline zinc (Zn) coating is electrodeposited on the WE43 Mg alloy followed by a chemical conversion treatment to produce a titania-Zn phosphate layer. The Zn coating has a rice-like nanostructure and the conversion layer is composed of ZnO, Zn3(PO4)2, and TiO2. The Zn coating reduces the corrosion current density of the WE43 Mg alloy from 151.1 ± 13.8 μA cm−2 to 29.4 ± 7.4 μA cm−2 in the simulated body fluid (SBF), while the composite coating decreases it to 4.1 ± 0.8 μA cm−2. The surface morphology, pH variation, and average corrosion rates after immersion for 7 days in SBF reveal that the Zn coating in fact accelerates dissolution of the Mg substrate due to the formation of galvanic couples between the Zn coating and Mg alloy substrate. In comparison, only slight corrosion is observed from limited areas on the sample with the composite coating. The titania-Zn phosphate/nanocrystalline Zn composite coating provides long-term protection in the physiological environment and the protection mechanism is discussed.

AB - Biodegradable medical implants made of magnesium (Mg) alloys must have sufficient corrosion resistance in clinical applications. Herein, a nanocrystalline zinc (Zn) coating is electrodeposited on the WE43 Mg alloy followed by a chemical conversion treatment to produce a titania-Zn phosphate layer. The Zn coating has a rice-like nanostructure and the conversion layer is composed of ZnO, Zn3(PO4)2, and TiO2. The Zn coating reduces the corrosion current density of the WE43 Mg alloy from 151.1 ± 13.8 μA cm−2 to 29.4 ± 7.4 μA cm−2 in the simulated body fluid (SBF), while the composite coating decreases it to 4.1 ± 0.8 μA cm−2. The surface morphology, pH variation, and average corrosion rates after immersion for 7 days in SBF reveal that the Zn coating in fact accelerates dissolution of the Mg substrate due to the formation of galvanic couples between the Zn coating and Mg alloy substrate. In comparison, only slight corrosion is observed from limited areas on the sample with the composite coating. The titania-Zn phosphate/nanocrystalline Zn composite coating provides long-term protection in the physiological environment and the protection mechanism is discussed.

KW - Biodegradable magnesium alloys

KW - Chemical conversion

KW - Coatings

KW - Corrosion

KW - Nanocrystalline zinc

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U2 - 10.1016/j.surfcoat.2021.126940

DO - 10.1016/j.surfcoat.2021.126940

M3 - RGC 21 - Publication in refereed journal

SN - 0257-8972

VL - 410

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

M1 - 126940

ER -

Titania-zinc phosphate/nanocrystalline zinc composite coatings for corrosion protection of biomedical WE43 magnesium alloy

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GRF: Nanostructured Ti-Based and Polymeric Orthopedic Implant Materials with Tailored Mechanobiocidal and Osteogenic Properties

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Titania-zinc phosphate/nanocrystalline zinc composite coatings for corrosion protection of biomedical WE43 magnesium alloy

Abstract

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GRF: Nanostructured Ti-Based and Polymeric Orthopedic Implant Materials with Tailored Mechanobiocidal and Osteogenic Properties

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