The Anodic Dissolution Reaction of InSb: Etch Patterns, Electron Number, Anodic Disintegration, and Film Formation

1971 ◽  
Vol 118 (3) ◽  
pp. 433 ◽  
Author(s):  
M. E. Straumanis ◽  
Lih-da Hu
Keyword(s):  
Anodic Dissolution ◽  
Film Formation ◽  
Electron Number ◽  
Etch Patterns ◽  
Dissolution Reaction

scholarly journals Anodic Dissolution of Spheroidal Graphite Cast Iron with Different Pearlite Areas in Sulfuric Acid Solutions

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Yoshikazu Miyata ◽  
Yuki Kuwahara ◽  
Shukuji Asakura ◽  
Tadashi Shinohara ◽  
Takao Yakou ◽  
...  
Keyword(s):  
Cast Iron ◽  
Anodic Dissolution ◽  
Spheroidal Graphite ◽  
Anodic Current Density ◽  
Acid Solutions ◽  
Anodic Current ◽  
Dissolution Reaction ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron ◽  
Sulfuric Acid Solutions

The rate equation of anodic dissolution reaction of spheroidal graphite cast iron in sulfuric acid solutions at 298 K has been studied. The cast irons have different areas of pearlite. The anodic Tafel slope of 0.043 V decade−1and the reaction order with respect to the hydroxyl ion activity of 1 are obtained by the linear potential sweep technique. The anodic current density does not depend on the area of pearlite. There is no difference in the anodic dissolution reaction mechanisms between pure iron and spheroidal graphite cast iron. The anodic current density of the cast iron is higher than that of the pure iron.

Copper Corrosion in Irradiated Environments. the Influence of H202 on the Electrochemistry of Copper Dissolution in Hcl Electrolyte

1986 ◽  
Vol 84 ◽  
Author(s):  
W. H. Smyrl ◽  
R. T. Bell ◽  
R. T. Atanasoski ◽  
R. S. Glass
Keyword(s):  
Anodic Dissolution ◽  
Rotation Rate ◽  
Film Formation ◽  
Copper Surface ◽  
Open Circuit ◽  
Ring Electrode ◽  
Positive Direction ◽  
Rotation Rates ◽  
Copper Dissolution ◽  
Copper Disk

AbstractThe anodic dissolution of copper has been examined in deaerated, 0.1 M HCl aqueous solution in the presence of H202. Concentrations of H202 up to 0.2 M were studied at a rotating copper disk-platinum ring electrode. The open circuit potential (OCP) of copper was found to depend on both peroxide concentration and rotation rate. The OCP shifts towards more positive values with increasing H202 concentration (C) and decreasing rotation rate (ω). The dependence of OCP on (C/ω1/2) was the same s for oxygenated solutions reported earlier [1], at small values of (C/ω1/2). At higher values of (C/ω1/2), departure from the expected behavior was observed. The current- voltage curves for anodic dissolution of copper were also influenced by the presence of peroxide. The curves recorded with the potential scanned in the positive direction showed the expected 60 mV slope, but the reverse scans showed significant departures. At a given potential scan rate, hysteresis was observed which was larger for higher H202concentrations, lower rotation rates, and more positive anodic potential limits. Monitoring the cuprous ions at the outer Pt ring revealed that there was a complex set of events taking place at the copper surface, including film formation and the appear- ance of cupric ions.

Anodic dissolution of zinc in aqueous-methanolic trichloroacetic acid solutions

1991 ◽  
Vol 56 (1) ◽  
pp. 236-240 ◽  
Author(s):  
Mohamed H. Hefny ◽  
Abdullah S. Babaqi ◽  
Mohamed S. El-Basiouny ◽  
Ragab M. Abdullah
Keyword(s):  
Anodic Dissolution ◽  
Water Molecules ◽  
Acid Solutions ◽  
Reaction Products ◽  
Temperature Analysis ◽  
Secondary Importance ◽  
Trichloracetic Acid ◽  
Dissolution Reaction ◽  
Steady State Current

Steady state current-potential curves for the anodic dissolution of zinc in aqueous-methanolic 0.25M trichloracetic acid solutions were constructed for wide ranges of the solution composition and temperature. Analysis of the results reveal that the increase of the water content and rise of temperature of the solution increases the corrosion rate. The most plausible role of the solvent lies within the stabilization of the anodic dissolution reaction products by water molecules. The changes in the properties of the solution due to the presence of methanol which give rise to hindrance of the anodic dissolution reaction are adsorption of methanol, change of viscosity and pH of the solution. These factors seem to be of secondary importance.

scholarly journals Towards a Physical Description of the Role of Germanium in Moderating Cathodic Activation of Magnesium

CORROSION ◽  
10.5006/3624 ◽  
2020 ◽  
Author(s):  
Carol Glover ◽  
Ruiliang Liu ◽  
Beth McNally ◽  
Shooka Mahboubi ◽  
Joseph McDermid ◽  
...  
Keyword(s):  
Anodic Dissolution ◽  
Anodic Polarization ◽  
Film Formation ◽  
Surface Film ◽  
H2 Evolution ◽  
Physical Description ◽  
Alloying Additions ◽  
Testing Condition ◽  
Electrode Technique

The role played by surface film formation in moderating cathodic activation (i.e. H2 evolution associated with anodic dissolution in NaCl (aq)) was determined for an Mg-0.3Ge (wt%) alloy and contrasted with this process in pure Mg. Cathodic activation was not detected using the scanning vibrating electrode technique (SVET) during anodic dissolution of the Mg-0.3Ge alloy under either freely corroding or anodic polarization conditions. Filament tracks that initiated under the more aggressive testing condition remained electrochemically inert. However, volumetric H2 evolution measurements revealed that Ge alloying additions ‘switch off’ the remote cathodes observed on previously corroded pure Mg surfaces, while Ge additions did not eliminate the “local” cathode at the principal sites of anodic activity (which cannot be detected by SVET). As such, the quantity of H2 measured on the corroding Mg-0.3Ge alloy arises exclusively from cathodic H2 evolution at the anodic sites. Moderation of sustained cathodic activation by alloying with Ge was associated with the incorporation of Ge into the inner MgO/Mg(OH)2 layer during anodic dissolution of Mg. It is possible that entrapped Ge particles or GeO2 serve as an effective poison for H recombination in the overall H2 evolution reaction that would otherwise readily occur on freshly formed Mg(OH)2 at anodic dissolution sites.

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