Corrosion of Zinc as a Function of pH

Thomas, Sebastian; Birbilis, Nick; Venkatraman, Murali Sankar; Cole, Ivan

doi:10.5006/1.3676630

Cited by 158 publications

(129 citation statements)

References 21 publications

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“…The purple arrow in Figure 2 indicates the range of biologically-important standard potentials determined at pH 7.4 [66]. As reported by Thomas et al [67] in their According to Bowen et al [59], thin layers of zinc oxide were the only product observed during early stages (1.5 and 3 months) on the surface of zinc wires (99.99% purity) implanted into rat aorta. However, as corrosion progressed to 4.5 and 6 months, the corrosion layer thickened and contained three different phases/layers: calcium phosphate, zinc oxide, and zinc carbonate.…”

Section: Corrosion Behavior Of Zinc In the Physiological Environmentmentioning

confidence: 59%

“…The purple arrow in Figure 2 indicates the range of biologically-important standard potentials determined at pH 7.4 [66]. As reported by Thomas et al [67] in their investigation of zinc corrosion as a function of pH, in the pH range 7 to 10, the lowered cathodic reaction rates reduce overall zinc corrosion rates, and the surface oxides thermodynamically predicted to form in this pH range do not form an effective corrosion protection barrier. Hence, zinc metals in physiological environments with a pH of 7.4 will be dissolved over time, as is required for biodegradable medical implants.…”

Section: Corrosion Behavior Of Zinc In the Physiological Environmentmentioning

confidence: 89%

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The Prospects of Zinc as a Structural Material for Biodegradable Implants—A Review Paper

Levy

Goldman

Aghion

2017

Metals

239

124

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Abstract:In the last decade, iron and magnesium, both pure and alloyed, have been extensively studied as potential biodegradable metals for medical applications. However, broad experience with these material systems has uncovered critical limitations in terms of their suitability for clinical applications. Recently, zinc and zinc-based alloys have been proposed as new additions to the list of degradable metals and as promising alternatives to magnesium and iron. The main byproduct of zinc metal corrosion, Zn 2+ , is highly regulated within physiological systems and plays a critical role in numerous fundamental cellular processes. Zn 2+ released from an implant may suppress harmful smooth muscle cells and restenosis in arteries, while stimulating beneficial osteogenesis in bone. An important limitation of pure zinc as a potential biodegradable structural support, however, lies in its low strength (σ UTS~3 0 MPa) and plasticity (ε < 0.25%) that are insufficient for most medical device applications. Developing high strength and ductility zinc with sufficient hardness, while retaining its biocompatibility, is one of the main goals of metallurgical engineering. This paper will review and compare the biocompatibility, corrosion behavior and mechanical properties of pure zinc, as well as currently researched zinc alloys.

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Section: Corrosion Behavior Of Zinc In the Physiological Environmentmentioning

confidence: 59%

Section: Corrosion Behavior Of Zinc In the Physiological Environmentmentioning

confidence: 89%

The Prospects of Zinc as a Structural Material for Biodegradable Implants—A Review Paper

Levy

Goldman

Aghion

2017

Metals

239

124

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“…Segundo Padilla e Alfantazi (2013), o íon cloreto age como um catalisador no processo de corrosão, aumentando a dissolução do zinco. O ideal seria usar solução de H2SO4 para ajustar o pH, pois, dessa forma, a concentração de cloreto mantem consistente para todas as soluções (GENTIL, 2011;THOMAS et al, 2012).…”

Section: Resultados Dos Ensaios De Polarização Potenciodinâmicaunclassified

“…Isso pode ser explicado pois, termodinamicamente, a espécie de zinco formada mais estável em um intervalo de pH de 1 até 5 é o íon Zn 2+ (THOMAS et al, 2012). Uma vez que as espécies são iguais, espera-se que ocorra as mesmas reações de redução e oxidação no meio.…”

Section: Comparação Dos Meios Reacionais Na Influência Da Corrosão Dounclassified

Corrosão De Aço Galvanizado Em Soluções Ácidas

Ruela¹,

Silveira²

2017

JCEC

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RESUMO: Neste estudo, o comportamento corrosivo do aço galvanizado em soluções ácidas é analisado através dos ensaios de potencial de circuito aberto e polarização potenciodinâmica. Os corpos de prova foram INTRODUÇÃOA corrosão é definida como a deterioração de um material por ação química ou eletroquímica do meio ambiente, aliada ou não a esforços mecânicos. Em geral, ela é um processo espontâneo que constantemente transforma os materiais metálicos, alterando sua durabilidade e seu desempenho, tornando-os insatisfatórios para os fins que se destinam. Ao estudar processos corrosivos, as variáveis dependentes do material metálico, do meio corrosivo e das condições operacionais devem ser levadas em consideração (GENTIL, 2011).A fim de minimizar os danos causados pela corrosão do material, alguns métodos preventivos são adotados, sendo os revestimentos metálicos comumente empregados para a proteção do aço. Um exemplo de metal utilizado para essa finalidade é o zinco e o aço revestido com o zinco é chamado de aço galvanizado. Esse revestimento forma uma barreira

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“…Thomas et al [22][23][24][25][26] have investigated the Zn corrosion as a function of pH in NaCl(aq) solution, 22 reported on the corrosion layers/products formed in contact with a seawater droplet, 23 and reported on the occurrence of the oxygen reduction reaction (ORR) on Zn oxide. [24][25][26] And finally, studies have shown that the role played by the microstructure is vital in the case of Zn alloycoated steels.…”

mentioning

confidence: 99%

Evidence for an Unusual Temperature Dependence of the Atmospheric Corrosion of Zinc

Esmaily

Mortazavi

Svensson

et al. 2016

J. Electrochem. Soc.

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The atmospheric corrosion behavior of zinc in the presence of NaCl has been investigated using well-controlled laboratory exposures in 95% RH air at ten different temperatures in the range −4 to 22 • C. Results show that a critical temperature (∼ −0.5 • C) exists in zinc corrosion above which the rate of corrosion is constant/independent of temperature, and, below which there is a positive correlation between temperature and corrosion rate. The corrosion products formed above and below −0.5 • C are also entirely different. While simonkolleite, hydrozincite and zinc carbonate hydroxide are the main corrosion products at T ≥ −0.5 • C, the same compounds are absent at T < −0.5 • C. Instead, sodium zinc carbonate (Na 2 Zn 3 (CO 3 ) 4 .3H 2 O) is the dominant corrosion product at low temperature, together with Na 2 ZnCl 4 · 3H 2 O and sweetite (Zn(OH) 2 ). The results are interpreted in terms of two distinct corrosion modes prevailing at "high" and "low" temperature, respectively.

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Corrosion of Zinc as a Function of pH

Cited by 158 publications

References 21 publications

The Prospects of Zinc as a Structural Material for Biodegradable Implants—A Review Paper

The Prospects of Zinc as a Structural Material for Biodegradable Implants—A Review Paper

Corrosão De Aço Galvanizado Em Soluções Ácidas

Evidence for an Unusual Temperature Dependence of the Atmospheric Corrosion of Zinc

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