ChemInform Abstract: Polarization Behavior of a Cobalt Rotating Disc Electrode in Sulfuric Acid Solutions in the Absence and Presence of Chloride Ions.

ChemInform ◽  
2010 ◽  
Vol 22 (31) ◽  
pp. no-no
Author(s):  
D. SAZOU ◽  
M. PAGITSAS
Keyword(s):  
Sulfuric Acid ◽  
Chloride Ions ◽  
Acid Solutions ◽  
Rotating Disc Electrode ◽  
Disc Electrode ◽  
Rotating Disc ◽  
Polarization Behavior ◽  
Sulfuric Acid Solutions

Isopotential points in the electrosorption of selenite, selenate, selenide, and tellurite at the platinum rotating disc electrode

1979 ◽  
Vol 57 (19) ◽  
pp. 2560-2563 ◽  
Author(s):  
Hélio C. Chagas
Keyword(s):  
Sulfuric Acid ◽  
Potential Range ◽  
Acid Solutions ◽  
Rotating Disc Electrode ◽  
Disc Electrode ◽  
Rotating Disc ◽  
Sulfuric Acid Solutions

Electrosorption at the platinum rotating disc electrode in sulfuric acid solutions of selenite, selenate, selenide, and tellurite gives rise to isopotential points in the potential range where oxidation of platinum occurs. The data are analyzed with the framework of the model put forward by Untereker and Bruckenstein. Since similar behavior is observed for the selenite, selenate, and selenide systems, it is tentatively inferred that a common electrosorbed species, possibly selenium itself, may be involved in these systems.

Solvent extraction of osmium(IV) from sulfuric acid solutions in the presence of chloride ions

2003 ◽  
Vol 68 (1-3) ◽  
pp. 141-150 ◽  
Author(s):  
A. Mayboroda ◽  
I.D. Troshkina ◽  
A.M. Chekmarev ◽  
H. Lang
Keyword(s):  
Sulfuric Acid ◽  
Solvent Extraction ◽  
Chloride Ions ◽  
Acid Solutions ◽  
Sulfuric Acid Solutions

Anodic Polarization Behavior of Fe-Si Alloys in Sulfuric Acid Solutions

CORROSION ◽  
1972 ◽  
Vol 28 (3) ◽  
pp. 77-82 ◽  
Author(s):  
WESLEY B. CROW ◽  
JAMES R. MYERS ◽  
J. V. JEFFREYS
Keyword(s):  
Sulfuric Acid ◽  
Anodic Polarization ◽  
Acid Solutions ◽  
Polarization Behavior ◽  
Sulfuric Acid Solutions

Anodic Polarization Behavior Of Nickel-Chromium Alloys In Sulfuric Acid Solutions

CORROSION ◽  
1965 ◽  
Vol 21 (9) ◽  
pp. 277-287 ◽  
Author(s):  
J. R. MYERS ◽  
F. H. BECK ◽  
M.G. FONTANA
Keyword(s):  
Sulfuric Acid ◽  
Critical Current Density ◽  
Critical Current ◽  
Acid Concentration ◽  
Current Density ◽  
Anodic Polarization ◽  
Chromium Content ◽  
Acid Solutions ◽  
Polarization Behavior ◽  
Sulfuric Acid Solutions

Abstract Anodic polarization behavior of annealed high-purity Ni, Cr and selected Ni-Cr alloys in hydrogen-saturated, 1, 5, 10 and 20N sulfuric acid solutions was investigated at 25 ± 1 C (77 F) using a potentiostatic technique. All specimens except pure Ni in 20N acid had an active-to-passive transition. Decreasing acid concentration increased passive potential range of pure Ni while acid concentration did not appreciably affect the passive region of pure Cr or the Ni-Cr alloys. Increasing acid concentration and decreasing chromium content increased the secondary passivation tendency in the transpassive region. No oxygen evolved in the transpassive region except for pure Ni and the higher nickel alloys. Tafel slopes for anodic dissolution, early transpassive region and oxygen evolution were determined. Corrosion potentials for pure Ni and Ni-Cr alloys containing up to 90 w/o Cr behaved as a reversible hydrogen electrode over the pH range 1.63 to −0.44. This linear relationship did not exist for the higher acid concentrations. Slope dependence for pure Cr and the 99Cr-1Ni alloy was −0.110. A minimum in critical current density versus percent Cr curves was established at 90 to 95 w/o Cr. Passivation potentials were determined. Passive current density decreased with increasing chromium content over the composition range 0 to 33 w/o Cr. It was established that increased specimen purity decreases the magnitude of critical current density and shifts corrosion and passivation potentials in the noble potential direction.

Study of the electrolytic reduction of Cr(VI) in aqueous solutions of chromic acid by the rotating disc electrode method

1978 ◽  
Vol 56 (15) ◽  
pp. 2042-2048 ◽  
Author(s):  
Hélio C. Chagas
Keyword(s):  
Chromic Acid ◽  
Reduction Process ◽  
Electrochemical Process ◽  
Chloride Ions ◽  
Rotating Disc Electrode ◽  
Disc Electrode ◽  
Concentrated Solutions ◽  
Rotating Disc ◽  
Previous Suggestion ◽  
Electrode Method

The Cr6+/Cr3+ reduction in aqueous solution is studied in the presence of sulfate and chloride ions by the rotating disc electrode method. In the low chromic acid concentration region, the results exhibit some differences in relation to those obtained using more concentrated solutions. However, it is demonstrated that in the presence of sulfate and chloride ions there is a chemical reaction preceding the electrochemical process, confirming a previous suggestion. Results for Cr6+/Cr3+ reduction process in perchloric acid medium at various temperatures are presented and a reduction mechanism is suggested.

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