Diffusion von Wasserstoff durch Titan

Brauer, E.; Nann, E.

doi:10.1002/maco.19740250502

Cited by 15 publications

(5 citation statements)

References 20 publications

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“…Except for $ in place of E, Eq. [23] and [24] are identical to those given for the limiting Temkin case, [T-l]. (It should be noted in passing that Eq.…”

Section: [Iii]mentioning

confidence: 56%

“…If reaction [1] is assumed to be in quasiequilibrium, with reaction [2] rate-determining, then one may equate r~ and r_l to obtain a relation between 0K and $ 0~ = -(F~/m) + (RT/m) In K',a(~ +) [23] Since the steady-state current density (in,~) corresponding to the HER is equal to -2Fr2, one may substitute 0~ from Eq.…”

Section: [Iii]mentioning

confidence: 99%

“…[19] derives directly from Eq. [23] and [24].) The electrons participating in the HER must traverse the oxide film, and the electron current density through the oxide was presumed to be correctly described by Eq.…”

Section: [Iii]mentioning

confidence: 99%

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Kinetics and Mechanism of the Hydrogen Evolution Reaction on Titanium in Acidic Media

Kelly

Bronstein

1984

J. Electrochem. Soc.

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The effects of potential and pH on the rate of the hydrogen evolution reaction on zone‐refined titanium have been determined in acidic sulfate and chloride media over the pH range of 0 to 4.0. In all cases, the cathodic Tafel slope is equal to −120 m.V, i.e., false(∂E/∂log|iH,∝|)normalpH=−2false(2.303RT/boldFfalse) . The reaction order with respect to proton activity, false(−∂log|iH,∝|/∂pH)E , exhibits a minimum value of 0.49 at pH=1.83 , and increases to a limiting value of 1.0 with increasing or decreasing pH. A mechanism in agreement with the aforementioned observations has been proposed. The mechanism consists of two parallel paths for rate‐determining proton discharge, one path involving the usual solvated proton and the other involving the adsorbed surface species false(normalTiOH)normalads+ , followed by the fast recombination reaction. Langmuir adsorption kinetics apply to the adsorbed hydrogen atoms. The proposed mechanism is consistent with what is known concerning the effect of potential upon the rate of absorption of hydrogen by the metal. The mechanism is also consistent with the mechanism of active‐state dissolution and passivation of titanium in acidic media, i.e., the hypothetical existence of a 3‐d phase oxide (as opposed to adsorbed oxy and hydroxy titanium species on the submonolayer level) on titanium in the active state is rejected.

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“…Except for $ in place of E, Eq. [23] and [24] are identical to those given for the limiting Temkin case, [T-l]. (It should be noted in passing that Eq.…”

Section: [Iii]mentioning

confidence: 56%

Section: [Iii]mentioning

confidence: 99%

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Kinetics and Mechanism of the Hydrogen Evolution Reaction on Titanium in Acidic Media

Kelly

Bronstein

1984

J. Electrochem. Soc.

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“…In dealing with hydrogen in metals or hydrides in a low pressure regime, the atomic hydrogen activity is presumably related to the square root of its equilibrium partial pressure (in atm) vs. p~ (1 arm), according to Haa = 1/2 H2~) [20] and…”

Section: J~ ---Di[(o In Ai/o In El)mentioning

confidence: 99%

Electrochemical Studies of Kinetic Properties of Titanium‐ and Vanadium‐Hydrogen Systems at Intermediate Temperatures Using Molten Salt Techniques

Liaw

Deublein

Huggins

1995

J. Electrochem. Soc.

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A novel molten salt technique for studying hydrogen transport in Ti and V metals is described. The molten-salt electrolytes were euteetic mixtures of alkali halides dissolved with excess LiH, operating in temperature ranges typically above 300~ to which electrochemical techniques were difficult to apply conventionally. We used the molten salt technique to investigate the thermodynamic properties of the Ti-H system previously. In this work, we determined composition-dependent diffusion and permeation data of hydrogen in Ti and in binary hydride phases using a galvanostatie intermittent titration technique (GITT). The results are in accordance with the best values reported by others using different techniques. We also reported some preliminary results regarding the kinetic properties of hydrogen in V and its hydride measured by more conventional time-lag and steady-state permeation techniques. The successful application of this molten salt technique in the metal hydrogen systems opened a new arena for potential applications in energy conversion and storage.

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“…According to Kaesche, [18] the development of hydrogen and the formation of titanium hydride in the course of the repassivation of titanium in aqueous solutions is discussed in the current literature. [21] Microstructural fatigue damage was examined by light and scanning electron microscopy for defined fatigue states and after specimen failure and correlated with the measured development of the hysteresis parameters as well as the temperature and the corrosion potential, respectively. [19,20] While the intact oxide layer represents a strong barrier to hydrogen, diffusion in titanium is readily possible and obviously takes place through the formation of titanium hydride.…”

mentioning

confidence: 99%

Characterization of the Cyclic Deformation Behaviour of the Implant Alloy TiAl6V4 in Air and Ringer’s Solution by Temoerature and Corrosion Potential Measurements

Fleck¹,

Eifler

2001

Adv. Eng. Mater.

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In comparison with other metals titanium alloys exhibit an advantageous combination of biocompatibility and mechanical properties which qualifies them as materials for orthopaedic and dental implants in direct contact with the surrounding tissue. Under physiological conditions, these implants are subjected to a complex interaction of mechanical and chemical-biological loading. [1] The mechanical loading component comprises cyclic stresses with varying amplitudes, mean values and directions as well as friction and wear at the different interfaces of the bone implant composite structure. These loads have to be sustained in a rather corrosive environment containing salts, proteins, enzymes and cells. Generally, the mechanical properties of implants and implant materials are characterized under single step loading conditions in Ringer's solution. A possible influence of the higher complexity of the in vivo conditions comprising the mechanical loading pattern as well as the chemical-biological environment on fatigue life, cyclic deformation behaviour as well as crack formation and growth have hardly been considered yet. Despite the physio-logical and mechanical relevance, microstructural investigations of the cyclic deformation behaviour of implant alloys under variable amplitude loading in the crack free fatigue state have scarcely been performed up to now.The mechanical properties of titanium and its alloys are strongly influenced by the microstructure which can be adjusted in a wide variety by thermomechanical treatments. Former work mainly treated different aspects related to fatigue life. [2][3][4][5][6][7][8][9] The influence of microstructural parameters, different surface treatments, loading conditions, corrosive media and temperatures on the fatigue strength and crack growth behaviour were hereby of main interest. For implant materials, the fatigue behaviour in physiological media is of prime interest. Rotating bending tests on specimens of TiAl5Fe2.5 in laboratory air and oxygen saturated Ringer's solution showed no influence of the corrosive medium on fatigue life. [9] Decreasing the oxygen content of the solution, however, resulted in a decrease in the bearable surface stress amplitudes for higher fatigue lives and corresponding longer exposure to the corrosive medium.In the present work, as a first step towards more complex testing conditions with respect to the mechanical loading pattern as well as the biological-chemical environment, the cyclic deformation behaviour of TiAl6V4 was characterized in single step rotating bending and axial variable amplitude tests.Materials and methods: Cylindrical specimens were produced from warm and subsequently cold drawn rods of the binary titanium alloy TiAl6V4. The fine equiaxed microstructure meets the requirements of DIN ISO 5832 for the use as implant material (Fig. 1). Rotating bending and axial fatigue specimens were made from rods of two different charges with diameters of 8 mm and 12 mm, respectively. The surfaces of both types of specimens were mechanically p...

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Diffusion von Wasserstoff durch Titan

Cited by 15 publications

References 20 publications

Kinetics and Mechanism of the Hydrogen Evolution Reaction on Titanium in Acidic Media

Kinetics and Mechanism of the Hydrogen Evolution Reaction on Titanium in Acidic Media

Electrochemical Studies of Kinetic Properties of Titanium‐ and Vanadium‐Hydrogen Systems at Intermediate Temperatures Using Molten Salt Techniques

Characterization of the Cyclic Deformation Behaviour of the Implant Alloy TiAl6V4 in Air and Ringer’s Solution by Temoerature and Corrosion Potential Measurements

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