On the corrosion behaviour of ultra-fine grain copper

Vinogradov, Alexei; Mimaki, Takuro; Hashimoto, Satoshi; Valiev, Ruslan Z.

doi:10.1016/s1359-6462(99)00170-0

Cited by 132 publications

(89 citation statements)

References 15 publications

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“…In addition, it was reported for the same material, structure alteration through various metal forming processes may affect pitting susceptibility and electrochemical behavior [11]. The corrosion behavior of UFG copper produced by ECAP method was investigated by Vinogradov et al [12]. They showed that the electrochemical behavior of copper does not qualitatively change after the process, because the shape of polarization curves and type of corrosive attack remain the same in the deformed and as-received conditions.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of equal channel angular pressed titanium for biomedical application

Göde

Attarilar

Eghbali

et al. 2015

AIP Conference Proceedings

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Abstract. Equal channel angular pressing method is one of the prominent severe plastic deformation techniques to obtain ultrafine grained and even nanostructured metals and alloys by imposing intense plastic strain. As known, pure titanium can be a suitable candidate for biomedical applications because it does not release any toxic ions into the body fluids and also, its biocompatibility properties. The present investigation deals the corrosion behavior of commercial pure titanium before and after ECAP process up to 10 passes by route B C at the 250 °C in the 0.9% NaCl solution. The electrochemical results revealed that the corrosion resistance of titanium sample is improved by adding pass number because of the fabrication of passive oxide layer on the surface of the material. It is found that about 92% reduction at the corrosion rate magnitude and also, approximately 41% improvement at the hardness value have been achieved at the final pass as compared to the annealed condition. Furthermore, it is observed that the passive film on the surface of final pass sample is dense and integral with uniform structure, while the as-received one has some rarefactions and does not have very uniform surface.

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Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of equal channel angular pressed titanium for biomedical application

Göde

Attarilar

Eghbali

et al. 2015

AIP Conference Proceedings

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“…Grain refinement down to ultrafine grains (UFG), re-distribution and fragmentation of second phases or impurities if existing in the material and texture evolution differ according to the applied processing route. In addition, the bulk material is characterized by high densities of dislocations and grain boundaries, internal elastic strains as well as residual stress thus delivering improved mechanical properties [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Strain Localization on Pitting Corrosion of an AlMgSi0.5 Alloy

Nickel

Dietrich

Mehner

et al. 2015

Metals

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Abstract:The corrosion susceptibility of an age-hardened aluminum alloy in different processing conditions, especially after a single pass of equal-channel angular pressing (ECAP), is examined. The main question addressed is how corrosive attack is changed by strain localization. For that purpose, an AlMgSi0.5 alloy with a strain localized microstructure containing alternating shear bands was subjected to potentiodynamic polarization on a macro-scale and micro-scale using the micro-capillary technique. Pitting potentials and the corrosion appearance (pit depth, corroded area fractions and volumes) are discussed with respect to microstructural evolution due to casting, extrusion and ECAP. Size, shape and orientation of grains, constituent particle fragmentation, cell size and microstrain were analyzed. Stable pitting of shear bands results in less positive potentials compared to adjacent microstructure. More pits emerge in the shear bands, but the pit depth is reduced significantly. This is attributed to higher microstrains influencing the stability of the passivation layer and the reduced size of grains and constituent particles. The size of the crystallographic pits is associated with the deformation-induced cell size of the aluminum alloy. OPEN ACCESSMetals 2015, 5 173

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“…Strong corrosion resistance is derived from the UFG 8th ECAPed Ta in the subtle circumstances like SBF or saline and this universally conforms to the previous discoveries of superior anticorrosion performances in the most of cases of the UFG materials (like Ti, Cu, Fe and others). [25][26][27][28] In terms of the corrosion rate described by penetration rate, the sequence of the corrosion resistance can be ordered as follows: the UFG 8th ECAPed Ta> the 4th ECAPed Ta> the 2nd ECAPed Ta> the 1st ECAPed Ta> the 0th ECAPed Ta. As for the ion release, a minimal amount of Ta ions which is lower the detection limitation of the facility can be measured in SBF until 14 days, thus the data is not listed and the threat can be omitted.…”

Section: Statistics Analysismentioning

confidence: 99%

Microstructures, mechanical behavior, cellular response, and hemocompatibility of bulk ultrafine‐grained pure tantalum

et al. 2013

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Bulk ultrafine-grained (UFG) pure Ta had been successfully prepared by equal channel angular pressing (ECAP) technique till eight passes. The 1st, 2nd, 4th, and 8th ECAPed Ta samples were investigated in the current study, with the 0th ECAPed Ta sample as the microcrystalline counterpart control. The microstructure and grain size distribution were characterized by X-ray diffractometer patterns, scanning electron microscopy, and transmission electron microscopy analysis by means of histogram. Although the mechanical behavior of all the experimental samples were analyzed through uniaxial tensile measurement and microhardness test, in vitro biological interactions onto the substrates such as protein adsorption, cellular responses derived from different types of cell lines, and the activity of erythrocyte and platelets were further evaluated and specifically assessed by bicinchoninic acid assay, enzyme-linked immunosorbent assay, and the method of colorimetric reading. A superior percentage of protein adsorption can be observed on the substrate of the UFG 8th ECAPed Ta (around 90%), even above those on the tissue culture plate (control) and the other ECAPed Ta samples. Furthermore, the UFG 8th ECAPed Ta shows no cytotoxic within 4 days culture when incubated with the murine fibroblast cell lines (L929). In addition, a priority order in the growth of endothelial cells (ECV304) other than vascular smooth muscle cells was observed in the case of the UFG 8th ECAPed Ta. In terms of hemolysis rate and adhered platelets (both the amount and the individual morphology), an evolutionary outcome of preferentially enhanced hemocompatibility can be concluded for the case of the UFG 8th ECAPed Ta.

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On the corrosion behaviour of ultra-fine grain copper

Cited by 132 publications

References 15 publications

Electrochemical behavior of equal channel angular pressed titanium for biomedical application

Electrochemical behavior of equal channel angular pressed titanium for biomedical application

Effect of Strain Localization on Pitting Corrosion of an AlMgSi0.5 Alloy

Microstructures, mechanical behavior, cellular response, and hemocompatibility of bulk ultrafine‐grained pure tantalum

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