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Effect of Fe(III) and Cu(II) on the Passivation of Ti-2 in Acidic Chloride Solutions

Published on Jan 1, 2019in Journal of The Electrochemical Society3.12
· DOI :10.1149/2.1021902jes
Y. Liu1
Estimated H-index: 1
,
Rebecca Schaller10
Estimated H-index: 10
,
Edouard Asselin16
Estimated H-index: 16
Abstract
  • References (46)
  • Citations (1)
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Abstract We report the first use of a CuFeS2 froth flotation mineral concentrate (MC) as an energy storage material in a fixed bed flow cell (FBFC). The performance of a graphite felt (GF) MC negative electrode (GF–MC) was also compared to a synthetic CuFeS2 electrode in the same FBFC. The Fe(II)/Fe(III) redox reaction (in the presence of Cu(II)) on the GF positive electrode (GF–Fe/Cu) supported the charge/discharge process. The kinetic parameters calculated from individual cyclic voltammetry sc...
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Abstract Coupling of metal oxidation in crevice corrosion to both O2 reduction on surfaces external to the crevice and H+ reduction occurring within the crevice, was studied using a galvanostatic crevice corrosion technique in conjunction with weight loss analyses. Results suggest internal H+ reduction is a significant contributor to the crevice corrosion of the studied alloys in 5 M NaCl at 120 °C. Repeat experiments suggest damage can be as much as doubled by H+ reduction. This process, howeve...
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Porous carbon materials are of tremendous importance for electrochemical energy storage. Their low cost, wide potential window and high surface area make them ideal electrodes for many applications. The activity of the electrode towards a certain reaction is given by both the available wetted surface area and the electron transfer constant k0. The present study investigates which electrochemical methods are suitable to determine k0 on porous carbon electrodes. For this purpose, we investigate th...
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Abstract A thermodynamic model is developed and shown to reliably simulate the speciation of the quaternary H 2 SO 4 –Fe 2 (SO 4 ) 3 –FeSO 4 –H 2 O system through a wide range of solution compositions and temperatures (25 °C–150 °C). The main species involved (including H + , Fe 2 + , Fe 3 + , SO 4 2 − , HSO 4 − , FeHSO 4 + , FeSO 4 °, FeHSO 4 2 + , Fe(SO 4 ) 2 − , FeSO 4 + , Fe 2 O 3 and H 2 O) were investigated, and their thermodynamic data were collected and critically assessed to evaluate th...
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Titanium is chosen as the construction material of autoclaves for pressure acid leaching of metal ores. The corrosion behavior of titanium was studied in sulfuric acid solutions with different addi...
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Hydrogen (deuterium) absorption into sputter-coated titanium (Ti) film electrodes during cathodic polarization in heavy water (D2O) was monitored using in-situ neutron reflectometry (NR) and electrochemical impedance spectroscopy (EIS). The scattering length density (SLD) of Ti metal increased with increasing cathodic polarization, due to the penetration of deuterium through the surface oxide and into the underlying metal. The rate of D absorption estimated from the NR data showed a pattern with...
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The corrosion of commercially pure unalloyed titanium (Ti-2) and titanium with 0.15 wt.% palladium (Ti-7) was studied in acid sulphate solutions with and without chlorides. Both immersion testing and electrochemical techniques were used to characterize the corrosion. Corrosion rates calculated from polarization experiments were related to maximum rates observed during immersion testing; the two values generally agreed within an order of magnitude. The palladium alloyed metal showed corrosion res...
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