Enhanced corrosion and wear resistance of AZ31 magnesium alloy in simulated body fluid via electrodeposition of nanocrystalline zinc

Li, Qingyang; Zhang, Qinqin; Liu, Anmin

doi:10.1016/j.mtla.2018.09.038

Cited by 22 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Whereas, a high degree of corrosion control can be achieved by varying the alloy composition this is limited significantly by the need to deliver the requisite mechanical properties, specifically adequate strength and flexibility to support surgical implantation [18,19]. An alternative means of controlling magnesium alloy corrosion is via the use of a barrier coating material which prevents the agents of corrosion reaching the implant surface [20][21][22]. However, as these implants are explicitly designed to be fully resorbed by the body, complete resistance to corrosion is counter indicative.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Hence, the coatings themselves need to degrade while offering a means of corrosion control such that their resistance to the environment is different than that of the underlying alloy. Recent work shows the deposition of a range of barrier coatings from zinc [20] to layer-by-layer coatings which incorporate DNA [22], among others [23][24][25]. Clearly, the degradation products produced by such coated alloys must be biocompatible and ideally bioactive [26].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

See 1 more Smart Citation

Control of magnesium alloy corrosion by bioactive calcium phosphate coating: Implications for resorbable orthopaedic implants

et al. 2019

View full text Add to dashboard Cite

Control of the corrosion that occurs in magnesium alloys in vivo is a significant challenge for their use as resorbable orthopaedic implants. In this work, we report on the provision of bioactive calcium phosphate (CaP) coatings on magnesium alloys that can delay substrate corrosion while offering an attendant physiochemical environment with properties known to promote an osteoinductive response in vivo. RF magnetron sputtering from hydroxyapatite (HA) powder targets has been employed to create CaP coatings on AZ31 magnesium alloy substrates. Coatings of 70 and 210 nm thickness were achieved via regulation of sputtering parameters, in particular deposition time. XPS and ToF-SIMS were used to investigate the chemistry of the coating alloy interface and also to confirm composition and thickness. The Ca/P atomic ratio of the coatings was determined by EDX to be 1.54. μCT analysis showed a substrate volume loss after 14 days exposure to SBF of 5.89 ± 3.15 mm 3 for the un-coated alloy while the presence of the ~70 nm CaP coating reduced this to 3.42 ± 0.48 mm 3 and the ~210 nm coating to 0.30 ± 0.28 mm 3. The corrosion rates were calculated to be 1.74 ± 0.06 mmpy for the AZ31 control; 1.57 ± 0.09 mmpy for the ~70 nm CaP coated alloy and 1.01 ± 0.07 mmpy for the ~210 nm thick CaP coating. These data confirm that CaP coating

show abstract

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

Control of magnesium alloy corrosion by bioactive calcium phosphate coating: Implications for resorbable orthopaedic implants

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Manteve-se um potencial praticamente estável por aproximadamente 1800 segundos, oscilando entre -1,000 e -1,025 V. O tempo de imersão da amostra durante a medida e a agressividade do eletrólito podem ter influenciado no resultado obtido. Observa-se, então, que os valores encontrados para Zamac 5 evidenciam que o comportamento da liga tende a assemelhar-se ao do metal puro [21][22][23]. Isso já era esperado, uma vez que a liga é formada basicamente por zinco.…”

Section: Potencial De Circuito Abertounclassified

“…A Figura 10 mostra as curvas de polarização potenciodinâmica das amostras de Base, Lateral Superior e Topo. Considerando que a corrosão do Zamac 5 assemelha-se ao processo desenvolvido pelo zinco [7,22], o comportamento da corrosão do zinco em eletrólito de NaCl desenvolve-se em duas reações parciais [24]. Essas equações, de redução e de oxidação, são descritas nos itens a seguir.…”

Section: Medidas Eletroquímicas De Polarização Potenciodinâmicaunclassified

Influência dos defeitos de solidificação na resistência à corrosão do Zamac 5 obtido por injeção sob pressão

et al. 2020

View full text Add to dashboard Cite

RESUMO Metais sanitários são objetos que, segundo as exigências vigentes do mercado consumidor, devem ser, ao mesmo tempo, resistentes à corrosão e bonitos, com aspecto espelhado brilhante. Estes são geralmente produzidos em latão fundido devido às suas características de fácil processamento e eletrodeposição. No entanto, para reduzir custos de produção, o latão tem sido substituído por ligas de zinco na fabricação destes componentes. O Zamac possui propriedades como baixo ponto de fusão em comparação ao latão, o que permite a obtenção de peças de paredes finas e geometrias complexas. A injeção sob pressão para obtenção de peças de ligas hipoeutéticas de zinco (Zamac 5) permite maior produtividade associada a melhores características dimensionais, com custo cerca de 30% menor do que o do latão. Este estudo apresenta a caracterização macro e microestrutural do Zamac 5 injetado sob pressão, relacionando-as com a resistência à corrosão da liga. Para tanto, foram realizados ensaios de névoa salina e análises por meio de microscopia eletrônica de varredura, ensaios de microdureza e ensaios eletroquímicos de corrosão. O Zamac 5 injetado sob pressão apresentou corrosão não-uniforme em regiões distintas da peça quando submetido à atmosfera agressiva. Os resultados também mostraram que este fato está associado aos defeitos de porosidade oriundos do processo de fabricação da liga. A microdureza da liga foi associada também aos defeitos oriundos do processo de fabricação. Por fim, evidenciou-se que o comportamento eletroquímico da liga é pouco influenciado pela presença dos defeitos.

show abstract

“…To increase hardness and especially corrosion resistance, different methods are used for the formation of protective coatings on the surface of the materials [4,5]. These are, among others: chemical conversion [6], electrophoretic deposition [7], hydrothermal treatment [8], chemical vapor deposition [9], electrodeposition [10], sol-gel process [11], and organic compounds deposition [12]. Among many possible and accessible coating methods to improve the corrosion resistance of magnesium alloys, plasma electrolytic oxidation (PEO), also known as the microarc oxidation (MAO) procedure, is a common technique due to its environmental friendliness and high performance [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Sodium Tetrafluoroborate on the Properties of Conversion Coatings Formed on the AZ91D Magnesium Alloy by Plasma Electrolytic Oxidation

Florczak

Nawrat²,

Darowicki³

et al. 2022

Processes

View full text Add to dashboard Cite

Magnesium and its alloys are widely used in many areas because of their light weight, excellent dimensional stability, and high strength-to-weight ratio. However, the material exhibits poor wear and corrosion resistance, which limits its use. Plasma electrolytic oxidation (PEO) is an effective surface modification method for producing ceramic oxide layers on Mg and their alloys. The influence of the additions of sodium tetrafluoroborate (NaBF4) and sodium fluoride (NaF) into alkaline-silicate electrolyte on the properties of the conversion layers formed in the magnesium AZ91D alloy has been investigated. Surface morphology and chemical composition were determined by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The anticorrosive properties of the layers were evaluated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) methods in simulated body fluid (SBF). The presence of NaBF4 or NaF in the electrolyte increases the corrosion resistance of the protective layer. However, the best anticorrosive properties show the layers obtained in the presence of NaBF4. This is probably caused by the incorporation of boron and fluorine in the form of Mg (BF4)2 mainly in the barrier layer.

show abstract

Enhanced corrosion and wear resistance of AZ31 magnesium alloy in simulated body fluid via electrodeposition of nanocrystalline zinc

Cited by 22 publications

References 24 publications

Control of magnesium alloy corrosion by bioactive calcium phosphate coating: Implications for resorbable orthopaedic implants

Control of magnesium alloy corrosion by bioactive calcium phosphate coating: Implications for resorbable orthopaedic implants

Influência dos defeitos de solidificação na resistência à corrosão do Zamac 5 obtido por injeção sob pressão

The Effect of Sodium Tetrafluoroborate on the Properties of Conversion Coatings Formed on the AZ91D Magnesium Alloy by Plasma Electrolytic Oxidation

Contact Info

Product

Resources

About