Current transients during repeated micro-indentation test of passive iron surface in pH 8.4 borate buffer solution

Yamamoto, Taisuke; Fushimi, Koji; Seo, Masahiro; Tsuri, S.; Adachi, Tetsuo; Habazaki, H.

doi:10.1016/j.elecom.2007.03.022

Cited by 9 publications

(11 citation statements)

References 15 publications

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“…This indicates that all of the film-ruptured areas covered with the indenter are exposed to the solution at L = 0. These waveforms of current transients observed during both, downward and upward drives are quite similar to those of other materials including iron and stainless steels (Fushimi et al, , 2011Yamamoto et al, 2007Yamamoto et al, , 2009aYamamoto et al, ,b, 2010 , although the current observed from the anodized aluminum surface is one order of magnitude larger than that for the other cases. The details about the emergence of the current peaks during the downward and upward drives have been discussed before Yamamoto et al, , 2009 .…”

Section: Methodssupporting

confidence: 65%

“…The hysteresis observed in the load-depth curve indicates that the specimen surface deforms elastically and plastically during the downward drive while it deforms only elastically during the upward drive. The hysteresis is larger than that for iron or stainless steels (Fushimi et al, , 2011Yamamoto et al, 2007Yamamoto et al, , 2009aYamamoto et al, ,b, 2010 , suggesting that the ratio of the volume of the plastic deformation to that of the elastic deformation for the aluminum surface is larger than that of iron based materials. Figure 2 shows onset time t p , height I p , and electric charge Q p of the current peaks as a function of E i .…”

Section: Methodsmentioning

confidence: 82%

“…The mechano-electrochemical response during the surface deformation measured as a flowing repassivation current enables the consideration of the film-rupture behavior on the basis of oxide film repair. In previous works, some of the authors investigated the effects of deformation behavior and area (Fushimi, Shimada, Habazaki, Konno, & Seo, 2011;Yamamoto, Fushimi, Habazaki, & Konno, 2010;Yamamoto et al, 2007) , surface hardness (Fushimi et al, 2011;Yamamoto, Fushimi, Habazaki, Konno, & Miura, 2009) and solution environment (Fushimi et al, 2011) on the rupture of a passive film on an iron substrate. A numerical model for the rupture of the iron passive film during the downward drive of the indenter was proposed (Fushimi, Yamamoto, Azumi, Seo, & Habazaki, 2007) .…”

Section: Introductionmentioning

confidence: 99%

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Effects of thickness and field strength of anodic oxide film on aluminum on its compressive rupture

et al. 2012

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The rupture behavior of an anodized aluminum surface was investigated in a borate buffer solution using an in situ micro-indentation test, in which transients of the indentation load and flowing current were monitored during loading and unloading of a sapphire indenter. A pair of anodic current peaks emerged during both downward and upward drives of the indenter due to rupture and repair of an anodic oxide film. The total area of film ruptured during both drives, as well as the area of radial cracks, increased with an increase in film thickness and with a decrease in electric field applied while an area of circular cracks was almost constant. It was suggested that the film -rupture owing to radial cracks formation was enhanced by tensile stress accumulated in the anodic oxide film by thickening of the oxide film and lowering of the electrostriction.

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Section: Methodssupporting

confidence: 65%

Section: Methodsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Effects of thickness and field strength of anodic oxide film on aluminum on its compressive rupture

et al. 2012

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“…The current peak and charge released are both significantly greater for the first indentation cycle as compared with those at the second and the subsequent indentations. This could be due to the plastic deformation that takes place during the first indentation, while elastic deformation is predominant for the second and subsequent indentations [17]. The indent size (approx.…”

Section: Micro-indentation and Associated Electrochemical Current Noisementioning

confidence: 99%

Micro- and Nano-scale Tribo-Corrosion of Cast CoCrMo

2011

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Previous studies have established that some of the wear damage seen on cast CoCrMo joint surface is caused by entrained third-body hard particles. In this study, wet-cell micro-indentation and nano-scratch tests have been carried out with the direct aim of simulating wear damage induced by single abrasive particles entrained between the surfaces of cast CoCrMo hip implants. In situ electrochemical current noise measurements were uniquely performed to detect and study the wear-induced corrosion as well as the repassivation kinetics under the micro-/nanoscale tribological process. A mathematical model has been explored for the CoCrMo repassivation kinetics after surface oxide film rupture. Greater insights into the nature of the CoCrMo micro-/nano-scale wear-corrosion mechanisms and deformation processes are determined, including the identification of slip band formation, matrix/carbide deformation, nanocrystalline structure formation and strain-induced phase transformation. The electrochemical current noise provides evidence of instantaneous transient corrosion activity at the wearing surface resulting from partial oxide rupturing and stripping, concurrent with the indent/scratch.

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“…Dependence on the crystallographic orientation The increased current is associated with repassivation of the mechanically ruptured passive sites (9). The current decreases rapidly to a level of the passivity-maintaining current immediately after stopping the downward drive.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Metal Texture on Depassivation-repassivation Behavior of Iron in Borate Buffer Solution Investigated by Micro-indentation

et al. 2009

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The effects of grain orientation and cold-rolling on the depassivation-repassivation behavior of polycrystalline irons were examined in pH8.4 borate buffer solution using in-situ microindentation technique. The depassivation rate on the passive iron surface during the downward drive of the indenter (penetration of an indenter tip into iron surface) depended on the grain orientation; the highest rate was obtained on {100} surface, on which a possible main slip plane of {110} was normal to the surface. In contrast, the total electric charge required for repassivation during the downward and subsequent upward drives was not influenced by the grain orientation. The electric charge for repassivation was strongly influenced by the rolling reduction that changed the dislocation density at the specimen surface. There was a linear correlation between the electric charge normalized by residual dent area and the square root of the dislocation density.

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Current transients during repeated micro-indentation test of passive iron surface in pH 8.4 borate buffer solution

Cited by 9 publications

References 15 publications

Effects of thickness and field strength of anodic oxide film on aluminum on its compressive rupture

Effects of thickness and field strength of anodic oxide film on aluminum on its compressive rupture

Micro- and Nano-scale Tribo-Corrosion of Cast CoCrMo

The Effect of Metal Texture on Depassivation-repassivation Behavior of Iron in Borate Buffer Solution Investigated by Micro-indentation

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