De-alloying at elevated temperatures and at 298 k-similarities and differences

Pickering, H. W.; Kim, Y.S.

doi:10.1016/0010-938x(82)90043-9

Cited by 39 publications

(21 citation statements)

References 17 publications

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“…Diffusion via these grain boundaries will provide a high concentration of lithium for rapid growth of the spinel. Local lithium concentration gradients that develop would tend to increase the pit depth at the expense of the diameter [19,20]. Eventually the advancing surface lithium-depletion front will overtake the pit depth, grain growth will occur and the fast lithium supply will be cut off and rapid oxidation will cease.…”

Section: A Model For Rapid Local Oxidationmentioning

confidence: 97%

Effect of short-time thermal oxidation on the surface of Al−Li−Cu−Mg alloy (8090) sheet

Partridge¹,

Chadbourne²

1989

J Mater Sci

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The oxidation behaviour of 8090 AI-Li alloy sheet was studied after exposure for short times (<5 min) in laboratory air, moist air, moist argon and hydrogen at 530 ° C. Oxidation was greater at grain boundaries in hydrogen but not in air. Sites of rapid local oxidation (number density 9 to 8 x 103 cm -2) were associated with insoluble particles. Four types of growth morphology were identified with these sites. Some growths believed to be spinel, were 10 to 25/~m diameter and grew to ~ 1 mm in height at 2 #m sec -1 . Pits beneath these growths were 25#m diameter and 10 to 20#m deep. A qualitative model is proposed for rapid oxidation in AI-Li alloys and the effect of these sites on weight gain measurements, surface contamination and mechanical properties is discussed.

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Section: A Model For Rapid Local Oxidationmentioning

confidence: 97%

Effect of short-time thermal oxidation on the surface of Al−Li−Cu−Mg alloy (8090) sheet

Partridge¹,

Chadbourne²

1989

J Mater Sci

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“…1 Such an evolution is observed at the selective dissolution of Ag-Au [2][3][4], Cu-Au [5][6][7][8], Ag-Pd [9], Cu-Pd [10], Zn-Cu [11,12], Al-Cu [13], Mn-Cu [14], Mg-Cd [15], In-Sn [16], and some other alloys, but only when the concentration of the more noble component B is relatively small, and it does not transfer to the solution, i.e., the dissolution of the alloy is definitely selective. For example, if the potential of anodic dissolution or corrosion exceeds a certain critical value E cr , on the originally smooth surface (with a small roughness f cr ), there quite rapidly appears a complex net of pits, cracks, and micropores, which gradually grow into channels and tunnels; and f r increases by tens.…”

Section: Introductionmentioning

confidence: 99%

10.1007/s11124-008-1002-1

2000

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Based on the model taking into account the appearance of a morphological instability and the evolution of a surface with time during the selective anodic dissolution of a homogeneous A-B alloy with the predominant content of the electrochemically negative metal A, equations for the critical potential E cr and overpotential η cr of the surface development are derived. Criteria of the nature of chemical hindrances of the selective dissolution in the over-critical range are formulated. The E cr and η cr values corresponding to the breakage of the morphological stability of the A-B alloy surface (with the atomic silver part X Ag = 0.65 to 0.95) in an acidic nitrate solution containing diverse amounts of silver ions ( 10 -4 to 10 -2 M) are experimentally found. The character of the effect of the atomic gold content in the alloy and the concentration of silver ions in the solution on η cr and E cr values of the alloys is determined. The nature of the kinetic limitations of the selective dissolution in the over-critical potential range is clarified. PACS numbers: 82.45.Q

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“…Dealloying of Pt alloys has ever been presented for these systems like Pt-Co [8,9], Pt-Al [10], Pt-Si [11], Pt-Ag [12], Pt-Zn [13] and Pt-Cu [14][15][16][17], etc. Therein, conventional nanoporous structures were formed by selective dissolution of active component and post heat coarsening.…”

Section: Introductionmentioning

confidence: 99%