Direct electrochemical measurement of dezincification including the effect of alloyed arsenic

Newman, R.C.; Shahrabi, T.; Sieradzki, Karl

doi:10.1016/0010-938x(88)90036-4

Cited by 66 publications

(46 citation statements)

References 8 publications

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“…[35] In fact, maintaining the surface oxide formed during dealloying, or deliberately introducing one or two monolayers of oxide on ligament surfaces, might be an effective and simple approach to stabilize the structure size and the actuation performance (strain amplitude). Another strategy is to introduce a third element in the master alloy, for instance, adding arsenic to brass, [60,61] in order to slow down Results of a nanoporous gold after removal of surface oxygen by reduction, with clean surface. See more details in Ref.…”

Section: Structural Stability Against Coarseningmentioning

confidence: 99%

Bulk Nanoporous Metal for Actuation

Jin¹,

Weißmüller²

2010

Adv Eng Mater

114

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Nanoporous metals prepared by controlled chemical or electrochemical corrosion of alloys can provide prototypical manifestations of bulk nanostructured material. Samples are readily prepared with dimensions at the millimeter or centimeter scale, while at the same time the microstructure is a homogeneous array of interpenetrating solid skeleton phase and pore channels with a characteristic size that can reach down to below 5 nm. The interest in nanoporous metals as functional materials derives from recent observations of unique materials behavior resulting from their extremely small structure size and their open porosity with large volume‐specific surface area. As an example, this article discusses the possible use of nanoporous metal for actuation.

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Section: Structural Stability Against Coarseningmentioning

confidence: 99%

Bulk Nanoporous Metal for Actuation

Jin¹,

Weißmüller²

2010

Adv Eng Mater

114

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“…The anodic dissolution of Cu/Zn alloys in neutral and alkaline solutions has been studied with special attention to dezincification [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The stress cracking of many brasses and the role of dezincification has been widely investigated [17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Passivity of ?-brass (Cu?Zn/67?33) and its breakdown in neutral and alkaline solutions containing halide ions

et al. 1991

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The passivation behaviour of e-brass (Cu : Zn = 67: 33) in alkaline solutions was studied using cyclic voltammetry and potentiostatic current transient measurements. The recorded cyclic voltammograms exhibited the main features usually observed for pure copper and zinc, and one additional anodic peak on the reverse potential scan. The height, sharpness and location of the different peaks depended greatly on the alkali concentration and the scan rate. The results show that the formation of Cu20 and Cu(OH)2 films proceed under ohmic resistance control following a dissolution-precipitation mechanism. The effect of F-, C1-and Br-ions on the passivity was also studied. The pitting potential was found to decrease with logarithm of halide ion concentration. The current transients in the absence and presence of halide ions were analysed. In the absence of pitting the current, after a few seconds, was found to increase linearly with the reciprocal of the square root of time while in the presence of pitting it was found to fit the Engell-Stolica equation.

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“…Hence, the enhancement is slight in the Al 70 Cu 18 Mg 12 alloy. Summary of the 2h and relative intensity corresponding to atomic pairs in the (Al 75 Cu 17 extrapolation of the anodic portion of the polarization curves of Cu and Ni showed the anodic current density of Cu and Ni was approximately 10 À7 A=cm 2 at the pitting potential of the (Al 75 Cu 17 Mg 8 ) 97 Ni 3 alloy ($À450 mV SCE ). The repassivation potential was also higher for the Al-Cu-Mg-Ni alloy as summarized in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…[11][12][13][14] In contrast, the addition of Pb, a less noble and lower melting temperature element, decreases the pitting resistance. 17,18 The porous structure, as a result of dealloying, can also be altered by secondary alloying elements in the precursor alloy or at the surface of the ligaments in the porous structure. It has been reported that the addition of a small amount (5 atom %) of phosphorous enhanced the pitting resistance of a Cu-Ti alloy.…”

mentioning

confidence: 99%

Pitting and Dealloying of Solute-Rich Al-Cu-Mg-based Amorphous Alloys: Effect of Alloying with Minor Concentrations of Nickel

Aburada

Fitzgerald

Scully

2011

J. Electrochem. Soc.

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The effect of Ni as a minor alloying element on the anodic dissolution behavior of solute rich Al-Cu-Mg-based amorphous alloys ((Al 75 Cu 17 Mg 8 ) 97 Ni 3 and Al 70 Cu 18 Mg 12 ) was studied. A small addition of Ni enhances both the pitting potential in 0.6 M NaCl, and resistance to dealloying 1 M HCl, and 5 M HCl þ 5 M LiCl solutions. A crystalline, Cu-rich nanoporous structure forms in pits as a result of selective dissolution of Al and Mg in both alloys, with the finest structure present in the Ni containing alloy. The increase in potential drop during pit stabilization due to the greater Ohmic resistance through the finer porous layer is one of the reasons that the pitting potential is ennobled. Ni in solid solution also hinders anodic dissolution in artificial pits which is speculatively linked to an increase the energy barrier for the dissolution of Al around Ni by forming stronger bonds. The Ni alloying also reduces the probability of finding Al-Al bonds. These result in a reduction in the dissolution kinetics which in turn ennobles the pit stabilization potential. Technological implications for corrosion resistant conventional Al-Cu-Mg alloy design and alternatively a new route to the creation of nanoporous Cu are discussed.

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Direct electrochemical measurement of dezincification including the effect of alloyed arsenic

Cited by 66 publications

References 8 publications

Bulk Nanoporous Metal for Actuation

Bulk Nanoporous Metal for Actuation

Passivity of ?-brass (Cu?Zn/67?33) and its breakdown in neutral and alkaline solutions containing halide ions

Pitting and Dealloying of Solute-Rich Al-Cu-Mg-based Amorphous Alloys: Effect of Alloying with Minor Concentrations of Nickel

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