A numerical model for current transients during micro-indentation of passive iron surface

Fushimi, Koji; Yamamoto, Taisuke; Azumi, Kazuhisa; Seo, Masahiro; Habazaki, H.

doi:10.1016/j.electacta.2007.05.003

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…1 shows a block diagram of experimental set-up for the micro-indentation. Most of experimental procedures were similar to those reported previously [2,3]. Iron plate (5 mm thickness) with a purity of 99.99% was vacuum-annealed at 1223 K for 1 h with following furnace cooling to room temperature for 48 h. The annealed specimen was rolled up to 1 mm thickness.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Hardness on Depassivation-repassivation Behavior of Pure Iron in Borate Buffer Solution

Yamamoto¹,

Fushimi²,

Miura³

et al. 2008

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Section: Methodsmentioning

confidence: 99%

“…The kinetics of passivation and the stability of passive film may also be influenced by the surface reactivity of metals, but the influence has not yet been fully understood. In this study, repassivation behavior of annealed and rolled high purity iron was investigated in borate buffer solution by in situ microindentation technique [2,3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hardness on Depassivation-repassivation Behavior of Pure Iron in Borate Buffer Solution

Yamamoto¹,

Fushimi²,

Miura³

et al. 2008

Meet. Abstr.

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“…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) . This test was also applied to evaluate the corrosion resistance of high molybdenum-containing stainless steel surface in a sodium chloride solution (Yamamoto et al, 2009) .…”

Section: Introductionmentioning

confidence: 99%

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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“…Recently, we have developed in-situ micro-indentation test to investigate the depassivation-repassivation behavior of the mechanically deformed area on passive surface (7)(8)(9)(10). The advantage of this technique is an ability to measure a load-depth curve and electrochemical response on the surface simultaneously at an intentional site of a specimen.…”

Section: Introductionmentioning

confidence: 99%

“…The advantage of this technique is an ability to measure a load-depth curve and electrochemical response on the surface simultaneously at an intentional site of a specimen. It was successfully applied to examine the depassivation-repassivation mechanism on pure iron (7,8), the role of elastic and plastic deformation in the depassivation-repassivation of iron (9), and the corrosion resistance of austenitic stainless steels (10).…”

Section: Introductionmentioning

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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A numerical model for current transients during micro-indentation of passive iron surface

Cited by 9 publications

References 16 publications

Effect of Hardness on Depassivation-repassivation Behavior of Pure Iron in Borate Buffer Solution

Effect of Hardness on Depassivation-repassivation Behavior of Pure Iron in Borate Buffer Solution

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

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

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