The effects of grain size and phosphorus on the corrosion of nanocrystalline Ni-P alloys

Rofagha, R.; Erb, U.; Ostrander, D.; Palumbo, G.; Aust, K.T.

doi:10.1016/0965-9773(93)90044-c

Cited by 113 publications

(68 citation statements)

References 15 publications

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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. [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%

“…Rofagha et al [9,10] compared the electrochemical corrosion of nanocrystalline Ni (grain sizes 32, 50, and 500 nm) with that of coarse-grained pure Ni (grain size 100 lm) in de-aerated 2N H 2 SO 4 solution. The study showed that although the nano-and microcrystalline Ni had similar active, passive and transpassive behavior, the current density in the passive region was higher in the case of nanocrystalline Ni, suggesting their higher corrosion rates, [9,10] as shown in Figure 4. Also, the open circuit potential (OCP) of the nanocrystalline Ni was found to be considerably nobler.…”

Section: A Ni-based Alloy Systemsmentioning

confidence: 99%

“…However, nanocrystalline metals and alloys have been reported to exhibit different oxidation/corrosion resistance to their microcrystalline counterparts. [8][9][10][11] It is also emphasized that besides the interest in investigating the role of nanocrystalline structure in oxidation/corrosion, another attractive aspect is the possibility of exploiting the enhanced grain boundary diffusion for the purpose of developing oxidation/corrosion resistant alloys with considerably less alloying contents. [8] In this context, developing commercially viable material processing routes for producing and retaining nanocrystalline structure of oxidation/corrosion resistant alloys is a major but non-trivial challenge.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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: 99%

Section: A Ni-based Alloy Systemsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Question arise if these trends hold for submicron-or nano-scale grain size. Corrosion resistance of nanocrystalline metals was rst reported by Rofagha et al on nanocrystalline nickel 53) and Ni-P 54) synthesized by elec-trodeposition. According to them, coarse-grained Ni and Ni-P exhibit passivation behavior while little passivation behavior was observed for the nanocryatalline counterparts, and this result does not follow Ralston s rule.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview

Miyamoto

2016

Mater. Trans.

122

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Corrosion of ultra ne grain (UFG) materials by severe plastic deformation (SPD) is reviewed in light of the existing literature and microstructural change. Fortunately, by holistic survey of the literature, it seems likely that grain re nement by SPD, while enhancing mechanical properties, does not compromise the overall corrosion resistance, and in many case, improve it in comparison with coarse-grained counterparts, although there are some contradictory results within the same materials and same environment. The degree of impact of UFG formation on corrosion is highest in stainless steels followed by aluminum and magnesium alloys whereas it is relatively marginal in pure copper and titanium. The effect of UFG formation by SPD on corrosion is imparted by not only grain re nement, but also other microstructural change occurring commonly in SPD in general and unique to each speci c SPD method. In this review, an attention is paid speci cally to the former case, and this includes shuf ing or redistribution of chemical inhomogeneity into a ner scale, deformation-induced grain boundaries and high internal stress stemming from these grain boundaries. The literature on stress corrosion cracking (SCC) of UFG materials are de nitely insuf cient to nd the general trends, more studies are waited.

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“…al. observed no difference in corrosion resistance between nanocrystalline pure Ni and its coarse grained counterparts [78] and a degradation in corrosion resistance was even reported for fine grained Ni-P [79].…”

Section: Corrosionmentioning

confidence: 92%

Severe plastic deformation of metals

Verlinden¹

2005

MJoM

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This paper provides an introduction in the field of severe plastic deformation (SPD). First of all the main methods to produce SPD materials are discussed. In the following section, the mechanisms leading to the formation of fine grains are reviewed and the influence of changes in strain path is highlighted. During post-SPD thermal annealing, some typical microstructural changes take place. The influence of SPD and subsequent annealing on strength, ductility and superplastic properties are reviewed. Finally the paper provides a short overview of fatigue resistance and corrosion properties of those materials.

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The effects of grain size and phosphorus on the corrosion of nanocrystalline Ni-P alloys

Cited by 113 publications

References 15 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

Corrosion of Ultrafine Grained Materials by Severe Plastic Deformation, an Overview

Severe plastic deformation of metals

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