The Effect of Surface Treatments and Electrochemical Methods on the Pitting Potentials of Zirconium in Chloride Solutions

Knittel, D. R.; Maguire, Michael A.; Bronson, Arturo; Chen, Jong Sheng

doi:10.5006/1.3577349

Cited by 13 publications

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“…Furthermore, it has been also reported that the addition of a small amount of tungsten to amorphous Fe-P-C alloys with or without chromium [41][42][43], to Ni-Fe [44] alloys and to the amorphous Ni-P alloys [45] is effective in improving the corrosion resistance of these alloys in aggressive hydrochloric acid solutions. Similarly, the addition of only small amount of tungsten (i.e., less than 10 at%) was enough to cause spontaneous passivation of the sputter-deposited nanocrystalline W-xCr alloys in 12 M HCl solution and they showed about five orders of magnitude lower corrosion rate than the corrosion rate of chromium metal [7,14,46]. On the other hand, tantalum is widely known for its superior corrosion resistance properties in aggressive acidic media.…”

Section: Introductionmentioning

confidence: 99%

The effect of tantalum addition on the corrosion behavior of W-xTa alloys in 1 M NaOH solution

Baral

Bhattarai

2013

BIBECHANA

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The role of tantalum addition on the corrosion behavior of the sputter-deposited nanocrystalline and amorphous W-xTa (x=8-77) alloys was studied in 1 M NaOH solution open to air at 25°C using corrosion tests and electrochemical measurements. Tungsten and tantalum metals act synergistically in enhancing the corrosion resistant properties of the W-xTa alloys and hence addition of 23 at% or more tantalum to the alloys were found to be effective to lower the corrosion rate of the alloys than those of alloy-constituting tungsten and tantalum elements. The corrosion rates of the W-xTa alloys containing 23-77 at% tantalum are nearly two orders of magnitude lower than that of tungsten and even slightly lower than that of tantalum in 1 M NaOH. Addition of tantalum metal in W-xTa alloys is effective for ennoblement of the open circuit corrosion potential of the tungsten metal in 1 M NaOH solution 25°C.DOI: http://dx.doi.org/10.3126/bibechana.v10i0.8363 BIBECHANA 10 (2014) 1-8

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Section: Introductionmentioning

confidence: 99%

The effect of tantalum addition on the corrosion behavior of W-xTa alloys in 1 M NaOH solution

Baral

Bhattarai

2013

BIBECHANA

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“…time for film development is not sufficient. The balance between film growth and surface activation may lead to a maximum in the Vr vs. scan rate curve (10) or to variable responses among a group of alloys (1,11). Although the lack of a shift of Vr to active values as scan rate increases may signify relatively rapid film formation kinetics, it does not appear to be a sufficient criterion for distinguishing more resistant alloys.…”

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confidence: 99%

“…Surface treatment affects film formation kinetics and, therefore, may affect V~ measurements (12). For example, 600 grit surfaces yield the most reproducible pitting data for Zr, as compared to chemical polish, electropolish, and air or vacuum anneal (10). Pitting resistance of stainless steels as measured by very rapid scanning also increases with finer grit finishes (13).…”

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An Electrochemical Study of the Pit Initiation Resistance of Ferritic Stainless Steels

Cieslak

Duquette

1985

J. Electrochem. Soc.

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A variety of electrochemical techniques has been used to study the resistance of ferritic stainless steels to pit initiation in 1M NaC1 at 80~ Critical pitting potentials have been measured by potentiodynamic anodic polarization and by the "scratch" technique. The effectiveness of passivation potential and alloy content to promote formation of a film that is resistant to breakdown has been studied by pit induction time measurements. The ability of the passive surface to adjust to abrupt changes in passivating conditions has been studied by potential stepping experiments. It has been shown that the effect of Cr on passive film properties is disproportionately great with respect to that of Mo for alloys of comparable pitting resistance. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.192.114.19 Downloaded on 2015-06-05 to IP Vol. 132, No. 3 PIT INITIATION RESISTANCE

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“…14,15 The corrosion behaviors of zirconium in aqueous solutions have been widely investigated. 16,17 But few publications have been found describing the pitting corrosion in non-aqueous solutions. 18 The corrosion behaviors of titanium in non-aqueous solutions like methanol, ethanol and propanol solutions were investigated with respect to the effect of water and aggressive ions.…”

Section: Introductionmentioning

confidence: 99%

Anodic Dissolution Behavior of Zirconium in n-Butanol Solutions Containing Bu<sup>n</sup><sub>4</sub>NBr

2016

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Anodic dissolution of zirconium in Bu n 4 NBr-containing n-butanol solutions was investigated using cyclic voltammetry, linear sweep voltammetry and potentiostatic current-time transient and scanning electron microscopy (SEM). Zirconium did not exhibit active dissolution due to passivation in the potential region of 0.2 to 1.2 V vs. SCE. The zirconium dissolution in passive state was under mass transfer control. Pitting corrosion took place as a result of passivity breakdown by Br − anions and the typical steady-state pitting potential was between 1.55-1.60 V vs. SCE in n-butanol solutions containing 0.08 M Bu n 4 NBr. SEM images confirmed the occurrence and the intensification of pits with an increase of potential. Increasing Bu n 4 NBr concentration accelerated the pit nucleation and growth. The reaction order leading to pit nucleation process was 1.0 with respect to bromide anions. The dissolution of zirconium in n-butanol solution produced Zr(OC 4 H 9 ) 4 .

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The Effect of Surface Treatments and Electrochemical Methods on the Pitting Potentials of Zirconium in Chloride Solutions

Cited by 13 publications

References 0 publications

The effect of tantalum addition on the corrosion behavior of W-xTa alloys in 1 M NaOH solution

The effect of tantalum addition on the corrosion behavior of W-xTa alloys in 1 M NaOH solution

An Electrochemical Study of the Pit Initiation Resistance of Ferritic Stainless Steels

Anodic Dissolution Behavior of Zirconium in n-Butanol Solutions Containing Bu<sup>n</sup><sub>4</sub>NBr

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