Die Wasserstoffentwicklungsreaktion an Titanhydriden

Brauer, E.; Nann, E.

doi:10.1002/maco.19740250702

Cited by 10 publications

(6 citation statements)

References 18 publications

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“…In addition, the deviation of the measured results from the theoretical values may be due to the formation of titanium hydride. Brauer et al 49 condensates (Fig. 7).…”

Section: Potentiodynamic Polarization Behavior Analysis Of Pure Ti In...mentioning

confidence: 93%

Electrochemical Behavior and Surface Characteristics of Pure Titanium during Corrosion in Simulated Desulfurized Flue Gas Condensates

Cui

Wang

Zhong

et al. 2018

J. Electrochem. Soc.

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Corrosion behavior of pure titanium in simulated desulfurized flue gas condensates in thermal power plant chimneys is investigated by electrochemical measurements and surface observations. Existence of fluoride ion leads to the breakdown of oxide film and promotes activation dissolution of Ti. Both anodic and cathodic reactions are enhanced by the increase of temperature, following an Arrhenius relationship. The participation of fluoride ion leads to low activation energy values. The corrosion process presents a two-step mechanism, in which dissolution of the adsorbed intermediate species is the rate determining step. Increase of temperature accelerates both of the two steps, especially the latter, and results in the low surface coverage of adsorbed species at high temperatures. Preferential dissolution occurs on specific grains and grain boundaries. Increase of temperature facilitates the crystallographic characteristics and aggravates the failure risk of the chimneys.

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“…In addition, the deviation of the measured results from the theoretical values may be due to the formation of titanium hydride. Brauer et al 49 condensates (Fig. 7).…”

Section: Potentiodynamic Polarization Behavior Analysis Of Pure Ti In...mentioning

confidence: 93%

Electrochemical Behavior and Surface Characteristics of Pure Titanium during Corrosion in Simulated Desulfurized Flue Gas Condensates

Cui

Wang

Zhong

et al. 2018

J. Electrochem. Soc.

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“…December IgTg zation for 100 hr in 6N H2SO4 (25~ at -0.SV vs. SCE, and Till0.9 after 100 hr in 1N H2SO4 (24~ at a cathodic current density of 20 mA/cm 2 (44). Similarly, Till has been observed after corrosion for 20 hr at 18 ~ in 15 weight percent HC1 (45), and Till2 after corrosion for 20 hr at I5~ in 12N HC1 (45), or after 16 hr in concentrated HC1 at 20~ (44).…”

Section: J E~ectrochem Soc: Electrochemical Science and Technologymentioning

confidence: 99%

“…This is less an assumption than a necessity, i.e., if one examines all of the possible potential and pH dependencies of all of the terms in Eq. [44] (see Eq. [36]- [40]), it becomes evident that it is not possible to satisfy Eq.…”

Section: [41]mentioning

confidence: 99%

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Anodic Dissolution and Passivation of Titanium in Acidic Media: III . Chloride Solutions

Kelly

1979

J. Electrochem. Soc.

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The electrochemical behavior of titanium in deoxygenated acidic chloride solutions, with and without additions of Ti(III) and Ti(IV) ions, has been determined and compared with that observed in acidic sulfate media. A monolayer mechanism has been developed for the active‐state dissolution and passivation of titanium in acidic media. According to this mechanism, the metal is oxidized in a sequence of one‐electron charge‐transfer reactions which results in the formation of adsorbed reaction intermediates corresponding to each of the relevant valence states of titanium (+1, +2, +3, +4) and which leads to Ti(III) ions in solution in the active and active‐passive transition regions. The mechanism is in quantitative agreement with the experimental results for both chloride and sulfate media. In acidic chloride solutions, as well as in acidic sulfate solutions, the rates of oxidation at a passive titanium surface of Ti(III) ions in solution to Ti(IV) and of reduction at an active‐state surface of Ti(IV) ions in solution to Ti(III) are directly proportional to the concentrations of Ti(III) and Ti(IV), respectively. The reduction of Ti(IV) at an active surface is responsible for the fact that, at a critical concentration of Ti(IV), an active‐state surface passivates. In localized corrosion systems, active and passive surfaces are in simultaneous contact with the electrolyte within the occluded cell, and the aforementioned oxidation and reduction reactions serve to couple the active‐state and passive‐state electrochemical systems. Such electrolyte‐coupled active‐passive systems are capable of generating the critical concentration of Ti(IV) required to passivate the active‐state surface, a fact which explains random spontaneous cessation of localized corrosion (self‐healing). The critical concentration of Ti(IV) is much greater in chloride solutions than in sulfate media and takes much longer to attain. Consequently, the halide ion functions as a promoter of localized corrosion.

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“…TiO2 content in the film increased with increasing temperature. (5) The results of calculation of hydrogen atoms produced on titanium surface from the cathodic polarization curves of titanium indicated that hydrogen atoms decreased with increasing temperature in the aerated HCl solutions. On the other hand, in the deaerated HCl solutions, hydrogen atoms increased with increasing temperature, but hydrogen absorption efficiency decreased at 200C.…”

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confidence: 99%

The Effect of Dissolved Oxygen on Prevention of Hydrogen Absorption of Titanium in Dilute HCl Solutions

Fukuzuka

Shimogori

Satoh

et al. 1979

Corrosion Engineering

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The region of passive/active state of pure titanium in aerated and deaerated dilute HCl solutions was determined and hydrogen absorption of titanium in the passive region was investigated. The results obtained are as follows. (1) The passive region of titanium was wider in the aerated HCl solutions than in the deaerated solutions. (2) In the aerated HCl solutions, titanium scarcely absorbed hydrogen at the whole temperature range of 70C to 250C. (3) In the deaerated HCl solutions, hydrogen absorption of titanium increased with increasing acidity and temperature of solution but did not increase over 200C.

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Die Wasserstoffentwicklungsreaktion an Titanhydriden

Cited by 10 publications

References 18 publications

Electrochemical Behavior and Surface Characteristics of Pure Titanium during Corrosion in Simulated Desulfurized Flue Gas Condensates

Electrochemical Behavior and Surface Characteristics of Pure Titanium during Corrosion in Simulated Desulfurized Flue Gas Condensates

Anodic Dissolution and Passivation of Titanium in Acidic Media: III . Chloride Solutions

The Effect of Dissolved Oxygen on Prevention of Hydrogen Absorption of Titanium in Dilute HCl Solutions

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