Corrosion rate of titanium in H2SO4

Krýsa, Josef; Mraz, R.; Roušar, I.

doi:10.1016/s0254-0584(97)80079-x

Cited by 34 publications

(14 citation statements)

References 16 publications

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“…The behaviour of Ti in aqueous acid solutions has, for decades, been studied by numerous authors, cf. [18][19][20][21][22][23][24][25]. The Ti behaviour is governed by the stability of the passive layer under the given conditions.…”

Section: Introductionmentioning

confidence: 99%

Enhancing PEM water electrolysis efficiency by reducing the extent of Ti gas diffusion layer passivation

et al. 2018

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Proton exchange membrane water electrolysis (PEM WE) suffers from several issues, such as the high cost and low stability of the electrolyser unit components. This is especially pronounced evident for an anode polarised to a high potential and in contact with an acidic membrane. Such a combination is detrimental to the vast majority of electron-conducting materials. Nowadays Ti (possessing a protective passive layer on its surface) is used as the construction material of an anode gas diffusion layer. Since the passivation layer itself is non-/semiconducting, an excessive degree of passivation leads to high surface contact resistance and to energy losses during PEM WE operation. This problem is usually solved by coating the Ti surface with precious metals. This leads to a further increase of the already very high cell investment costs. In this work an alternative method based on appropriate Ti etching (in acid) is presented. The (surface) composition of the samples treated was investigated using SEM, X-ray fluorescence and diffraction and photoelectron spectroscopy. TiHx was found in the subsurface layer. This was responsible for preventing excessive passivation of the Ti metal. The superior performance of the etched Ti gas diffusion layer (compared to non-etched) in a PEM water electrolyser was confirmed during an (>100 hour) experiment with current densities of up to 1 A cm -2 . Using the described treatment the surface contact resistance was substantially reduced and its increase during PEM WE operation was largely suppressed. As this method is very simple and cheap, it has tremendous potential for improving PEM WE process efficiency.

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Section: Introductionmentioning

confidence: 99%

Enhancing PEM water electrolysis efficiency by reducing the extent of Ti gas diffusion layer passivation

et al. 2018

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“…The effects of microstructure on the corrosion properties of titanium alloys have not been studied extensively. [11][12][13][14] Environmental conditions determine the nature, composition, and thickness of the passive oxide film formed on titanium alloys. 1 This behavior is due to the formation of a protective, hard, and tightly adherent oxide film that mainly consists of titanium dioxide (TiO 2 ) and is formed instantaneously in the presence of oxygen.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Ti-6Al-4V with Different Thermomechanical Treatments and Microstructures

et al. 2010

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The corrosion behavior of four different microstructures ofTi-6Al-4V with varying volume fractions of primary α (0, 10%~20%, 40%~50%, and ~90%) was investigated in sodium chloride (NaCl) and hydrochloric acid (HCl) solutions. The microstructure constituent morphologies and distributions were characterized with optical and scanning electron microscopy (SEM) while constituent compositions were determined with energy-dispersive x-ray (EDX) analysis. All four microstructures exhibited spontaneous passivity in 0.9% NaCl at 37°C and active/passive transitions in 1.5 M HCl at 37°C. Very little difference in corrosion rate was observed using potentiodynamic polarization curves and weight-loss tests. However, SEM analysis of corroded surfaces indicated that the fully lamellar structure (0% primary α) exhibited the worst attack. Analysis of surfaces after 48 h immersion in 3.5 M HCl revealed that α/b phase boundaries were preferential sites for corrosion attack. Also, b phase in lamellar structures exhibited preferential dissolution in comparison to α phase. The corrosion results are discussed in terms of microstructure and constituent composition. In particular, the extent of partitioning of vanadium to the b phase during heat treatment varies with the volume fractions of primary α and transform b, which affects the corrosion performance in aggressive environments.

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“…Most investigations have been carried out in acid media, e.g. H 2 SO 4 (2)(3)(4)(5)(6)(7)(8) , HNO 3 (9,10) and H 3 PO 4 (11) . Additionally, the influence of hydrofluoric acid and fluoride ion on the corrosion and passive behavior of titanium was studied (12)(13)(14) .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of Titanium Electrode in Aqueous Bromide Solutions

Attia¹

2006

Al-Azhar Bulletin of Science

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The behavior of Ti electrode in some bromide solutions of HBr, NaBr and MgBr 2 was studied using different techniques (open circuit potential, potentiostatic, potentiodynamic and galvanostatic polarization). The obtained results revealed that in the three different bromide solutions there was a tendency of Ti for passivation. Titanium was susceptible to pitting corrosion in aqueous bromide solutions under potentiodynamic technique. The oxide film stability was affected by the nature of the electrolyte, scanning rate and applied potential. Also, a steady state Ti/ TiO 2 electrolyte system was observed. The oxide film thickness and the formation rate reached their highest values in MgBr 2 solutions.

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Corrosion rate of titanium in H2SO4

Cited by 34 publications

References 16 publications

Enhancing PEM water electrolysis efficiency by reducing the extent of Ti gas diffusion layer passivation

Enhancing PEM water electrolysis efficiency by reducing the extent of Ti gas diffusion layer passivation

Corrosion Behavior of Ti-6Al-4V with Different Thermomechanical Treatments and Microstructures

Electrochemical Behavior of Titanium Electrode in Aqueous Bromide Solutions

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