Electrochemical corrosion behavior of nanocrystalline Co coatings explained by higher grain boundary density

Wang, Liping; Lin, Yongbiao; Zeng, Zhixiang; Liu, Weimin; Xue, Qunji; Hu, Litian; Zhang, Junyan

doi:10.1016/j.electacta.2006.12.009

Cited by 131 publications

(44 citation statements)

References 35 publications

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“…A higher corrosion resistance of the β-Ta coating is intimately connected with its nanoscale microstructure. Compared to the two reference coarse-grained samples, the β-Ta nanocrystalline coating has higher volume fraction of grain boundaries, which provide more short paths for alloy element diffusion and facilitate rapid formation of a thermodynamically stable passive layer [73]. Furthermore, previous studies indicated that the passive film formed on nanostructured materials has a lower carrier density [74], which is agreement with the results of the Mott-Schottky analysis.…”

Section: Discussionsupporting

confidence: 80%

Nanocrystalline β-Ta Coating Enhances the Longevity and Bioactivity of Medical Titanium Alloys

Liu

Jiang

2016

Metals

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A β-Ta nanocrystalline coating was engineered onto a Ti-6Al-4V substrate using a double cathode glow discharge technique to improve the corrosion resistance and bioactivity of this biomedical alloy. The new coating has a thickness of~40 µm and exhibits a compact and homogeneous structure composed of equiaxed β-Ta grains with an average grain size of~22 nm, which is well adhered on the substrate. Nanoindentation and scratch tests indicated that the β-Ta coating exhibited high hardness combined with good resistance to contact damage. The electrochemical behavior of the new coating was systematically investigated in Hank's physiological solution at 37 • C. The results showed that the β-Ta coating exhibited a superior corrosion resistance as compared to uncoated Ti-6Al-4V and commercially pure tantalum, which was attributed to a stable passive film formed on the β-Ta coating. The in vitro bioactivity was studied by evaluating the apatite-forming capability of the coating after seven days of immersion in Hank's physiological solution. The β-Ta coating showed a higher apatite-forming ability than both uncoated Ti-6Al-4V and commercially pure Ta, suggesting that the β-Ta coating has the potential to enhance functionality and increase longevity of orthopaedic implants.

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Section: Discussionsupporting

confidence: 80%

Nanocrystalline β-Ta Coating Enhances the Longevity and Bioactivity of Medical Titanium Alloys

Liu

Jiang

2016

Metals

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“…Early fundamental studies on the role of nanostructure in electrochemical corrosion were carried out on Co, [107][108][109] Cu, [107,[110][111][112] Ni, [10,[113][114][115][116] and Ni-based binaries. [9,[117][118][119] Traditionally, it is believed that electrochemical inhomogeneity at the metal surface due to the excess of high energy areas with much greater degree of disorder like grain boundaries and triple junctions (such as those in the case of the nanocrystalline materials), can make these materials more anodic.…”

Section: Aqueous Corrosionmentioning

confidence: 99%

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Mahesh

Raman

2014

Metall Mater Trans A

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The extremely fine grain size of nanocrystalline (nc) metallic alloys results in significantly different mechanical, electrochemical and oxidation properties as compared to the coarse-grained alloys of the same composition. Although the synthesis and attractive mechanical properties of nanocrystalline materials have been investigated and reviewed in great depth, the high temperature oxidation and electrochemical corrosion of these materials has received limited attention. The difference in the active dissolution and passivation behavior of nc alloys as compared to their microcrystalline counterparts varies for each alloy system. However, a unified theory explaining these phenomena still eludes us. In this context, this article reviews the progress in the electrochemical corrosion behavior of different nanocrystalline alloys, and hence, develops a better understanding of the effect of grain size, composition, interfacial phenomena and selective dissolution on corrosion of nanocrystalline alloys. This review also presents the role of nanometric grain size and the associated increase in grain boundary diffusion on the high temperature oxidation of nc alloys. The attractive possibility of enhanced oxidation resistance at lower alloying additions as compared to the coarse-grained alloys has been discussed. Although the primary focus of the article is on ferrous alloy systems, however, the lead studies on the role of ultrafine grain size in oxidation/corrosion behavior of other alloys systems have also been reviewed.

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“…Furthermore, the electrochemical corrosion would always begin at the boundary of the nuclei abutting to each other, since this particular region possesses more unbalanced Gibbs free energy than the center of nuclei [13]. For these reasons, the stripping process can be described as that the anodic corrosion is occurred preferentially at the boundary of the nuclei sites where only Bi atoms are dissolved into solution.…”

Section: Resultsmentioning

confidence: 99%

Template-Free Bipotentiostatic Deposition of Thermoelectric BixTey Nano Arrays

Xin¹,

Wang²,

Zhao³

2017

MSCE

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Monodispersed Bi-Tenano arrays are achieved via template-free bipotentiostatic deposition. The diameter and length of individual nanorod is ~80 nm and ~250 nm respectively. The electrodeposition process is demonstrated to follow a two-step mechanism: an instantaneous reductive potential is applied to form dispersive nuclei, then a reverse oxidative potential strips partial Bi atoms to prevent further cross-growth. Repeatedly, the nano arrays film is obtained eventually. The thermoelectric properties of the obtained Bi-Tenano arrays such as electrical resistance, carrier density, Seebeck coefficient and power factor are measured to be 2.438 × 10 −4 Ω·m, 4.251 × 10 20 cm −3 , −25.892 μV·K −1 , 2.750 × 10 −6 W·m −1 ·K 2 , respectively.

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Electrochemical corrosion behavior of nanocrystalline Co coatings explained by higher grain boundary density

Cited by 131 publications

References 35 publications

Nanocrystalline β-Ta Coating Enhances the Longevity and Bioactivity of Medical Titanium Alloys

Nanocrystalline β-Ta Coating Enhances the Longevity and Bioactivity of Medical Titanium Alloys

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Template-Free Bipotentiostatic Deposition of Thermoelectric BixTey Nano Arrays

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