Anodic oxidation mechanism of a spiropyran

1996 ◽  
Vol 92 (20) ◽  
pp. 3991 ◽  
Author(s):  
Michael J. Preigh ◽  
Mark T. Stauffer ◽  
Fu-Tyan Lin ◽  
Stephen G. Weber
Keyword(s):  
Anodic Oxidation ◽  
Oxidation Mechanism

Investigation of anodic oxidation mechanism of 4H-SiC (0001) for electrochemical mechanical polishing

2018 ◽  
Vol 271 ◽  
pp. 666-676 ◽  
Author(s):  
Xu Yang ◽  
Rongyan Sun ◽  
Yuji Ohkubo ◽  
Kentaro Kawai ◽  
Kenta Arima ◽  
...  
Keyword(s):  
Anodic Oxidation ◽  
Oxidation Mechanism ◽  
Mechanical Polishing ◽  
Electrochemical Mechanical Polishing

New Method for Low-Cost Titanium Production

2010 ◽  
Vol 436 ◽  
pp. 41-53 ◽  
Author(s):  
Ana Maria Martinez ◽  
Karin Sende Osen ◽  
Egil Skybakmoen ◽  
Ole Sigmund Kjos ◽  
Geir Martin Haarberg ◽  
...  
Keyword(s):  
Anodic Oxidation ◽  
Carbothermal Reduction ◽  
Low Cost ◽  
Oxidation Mechanism ◽  
Raw Material ◽  
Electrochemical Studies ◽  
Complete Conversion ◽  
Molten Chloride ◽  
The Stability ◽  
Titania Slag

The present work deals with the investigation of an electrolytic method for titanium production that uses TiO2 enriched titania slag as raw material. The process involves two steps: i) carbothermal reduction of the slag to form titanium oxycarbide powder; and ii) electrolysis in a molten chloride-based electrolyte using a titanium oxycarbide consumable anode. Electrochemical studies show the stability of the different Ti species in the equimolar NaCl-KCl melt at 850oC. These results, together with previous work about the anodic oxidation mechanism of a consumable titanium oxycarbide anode in molten chlorides, allow us to optimize the anode and cathode voltages in the electrolysis experiments. The results show that best quality titanium deposits are obtained when the reduction occurs in a single electrochemical step, i.e. directly from di-valent titanium species to Ti metal. Then, the complete conversion of the Ti(III) ions released from the consumable oxycarbide anode to Ti(II) species by adding Ti sponge to the electrolyte, must be fulfilled.

Preparation and properties of the anodized film on Fe-Cr-Al alloy surface

2020 ◽  
Vol 67 (4) ◽  
pp. 379-386
Author(s):  
Jialin Yang ◽  
Yunting Guo ◽  
Wei Zai ◽  
Siyuan Ma ◽  
Liang Dong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ethylene Glycol ◽  
Anodic Oxidation ◽  
Current Density ◽  
Oxidation Process ◽  
Electrochemical Impedance ◽  
Oxidation Mechanism ◽  
Oxidation Time ◽  
Al Alloy ◽  
Content Type

Purpose This paper aims to find a way to improve the surface insulation, corrosion resistance and mechanical properties of Fe-Cr-Al electrothermal alloy, exploring the best oxidation condition and analyzing the oxidation mechanism. Design/methodology/approach Electrochemical workstation was used for anodic oxidation, and the effect of current density, ethylene glycol concentration and oxidation time on properties of the film were investigated by resistivity test, scanning electron microscope, electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy) and mechanical tests, and the oxidation process was analyzed by X-ray photoelectron spectroscopy (XPS). Findings According to the potential-time curves of anodic oxidation and the analysis of XPS, the whole oxidation process can be divided into four stages. When the current density is 0.8 A/dm2, the ethylene glycol concentration is 10%, and the oxidation time is 60 min, the film has the best corrosion protection, mechanical properties and surface morphology. The resistivity of the samples is about 13 orders magnitude than that of the matrix. Originality/value In this paper, a protective electrically insulating film was prepared by anodic oxidation in an alkaline electrolyte solution. The oxidation conditions were optimized and the oxidation mechanism was analyzed.

Sign in / Sign up

Export Citation Format

Share Document