A comparison of the corrosion behaviour of polycrystalline and nanocrystalline cobalt

Kim, S.H.; Aust, K.T.; Erb, U.; Gonzalez, F.; Palumbo, G.

doi:10.1016/s1359-6462(02)00651-6

Cited by 87 publications

(18 citation statements)

References 4 publications

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“…[11,[120][121][122] So, in simplistic terms, the corrosion rate of a material in nanocrystalline state should be much higher as compared to that in its microcrystalline form. Some experimental evidences have supported this view [10,117,121,122] while majority have shown contradictory behavior. [116,[123][124][125] This section will first list a few of the studies on different alloy systems and then subsequently summarize the common characteristics which govern the corrosion in nanocrystalline materials.…”

Section: Aqueous Corrosionmentioning

confidence: 96%

“…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. [11,[120][121][122] So, in simplistic terms, the corrosion rate of a material in nanocrystalline state should be much higher as compared to that in its microcrystalline form.…”

Section: Aqueous Corrosionmentioning

confidence: 99%

“…Sigma (r) indicates the internal or externally applied stress. [117] Fig. 7-Potentiodynamic polarization for Ni-based cast superalloy and nanocrystalline coating in (a) 0.25M Na 2 SO 4 + 0.05M H 2 SO 4 solution (b) 0.5M NaCl + 0.05M H 2 SO 4 solution.…”

Section: B Fe-based Alloy Systemsmentioning

confidence: 99%

“…Such improvements in corrosion behavior have also been evidenced in other alloy systems, viz., W-Ta alloy film produced by magnetron sputtering, [144] nanocrystalline Zr-based alloys (as compared to amorphous Zr alloys) [145] and Co-based alloys. [107,117] …”

Section: Other Nanocrystalline Metals and Alloysmentioning

confidence: 99%

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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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Section: Aqueous Corrosionmentioning

confidence: 96%

Section: Aqueous Corrosionmentioning

confidence: 99%

Section: B Fe-based Alloy Systemsmentioning

confidence: 99%

Section: Other Nanocrystalline Metals and Alloysmentioning

confidence: 99%

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

Mahesh

Raman

2014

Metall Mater Trans A

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“…Corrosion properties are also important for structural application. The beneficial effect of grain size reduction to the nanoscale was first demonstrated for intergranular corrosion in electrodeposited nanocrystalline nickel thanks to the pioneering work of Rofagha et al [6], Kim et al [7,8], followed by Mahesh and Raman [9]. They observed a rather smooth surface with a smaller penetration rate at grain boundaries and thus considerable improvement in intergranular corrosion.…”

Section: Introductionmentioning

confidence: 99%

Effects of Strain Energy and Grain Size on Corrosion Resistance of Ultrafine Grained Fe-20%Cr Steels with Extremely low C and N Fabricated by ECAP

Rifai

Miyamoto

Fujiwara

2015

International Journal of Corrosion

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Effect of strain energy and grain size on corrosion resistance of ultrafine grained (UFG) Fe-20%Cr steels with extremely low C and N fabricated by equal channel angular pressing (ECAP) was investigated. UFG structures of initial grain size of 144 nm exhibited the typical three-stage softening comprising recovery, recrystallization, and grain growth. Potentiodynamic polarization measurements were carried out with a conventional three-electrode cell to evaluate pitting potential. Pitting potential in 1000 mol⋅m −3 NaCl solution was nobler in UFG state, but pitting potential started to decrease monotonously at lower temperature compared to hardness. The degradation of corrosion resistance in the early stage of annealing is attributed to stability change of passivation by recovery of dislocation structures inside grains and in nonequilibrium grain boundaries. We therefore conclude that nobler potentials of UFG states were realized by not only grain size reduction but also defective deformation-induced UFG.

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Corrosion Behavior of Electrodeposited Nanocrystals

Erb

2011

Uhlig's Corrosion Handbook

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A comparison of the corrosion behaviour of polycrystalline and nanocrystalline cobalt

Cited by 87 publications

References 4 publications

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

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

Effects of Strain Energy and Grain Size on Corrosion Resistance of Ultrafine Grained Fe-20%Cr Steels with Extremely low C and N Fabricated by ECAP

Corrosion Behavior of Electrodeposited Nanocrystals

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