Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Cathodic reaction"”.
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The effect of cyclic wetting and drying on the corrosion rate of steel in reinforced concrete
… of corrosion can be controlled through anodic, cathodic or resistivity processes. However, high chloride concentrations tend to prevent anodic control from governing the corrosion rate, while direct exposure to moisture generally prevents resistivity control. Consequently, cathodic control …
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Thermodynamic studies of xanthate adsorption on pyrite
… shown that the ΔG° of the proposed half-cell reaction, i.e., 2X<sup>-</sup> X<sub>2</sub> + 2e, is negative for all the xanthate homologues, i.e., potassium ethyl xanthate (KEX), potassium amyl xanthate (KAX), and potassium octyl xanthate (KOX), investigated. The major contribution to the free …
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Development of the gel plating process for selective gold metallization
… of the Gel Plating Process was found to be reaction rate controlled at short times and diffusion controlled at longer times. A reaction rate model and a diffusion model with a heterogeneous reaction were fit to plating rate data at 50 °C and 60 °C. The reaction rate model was used to …
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Influences of Water Chemistry and Flow Conditions on Non-Uniform Corrosion in Copper Tube
… to chloride is believed to be the primary cathodic reaction limiting the overall rate of corrosion in this type of water. As such, a subsequent study considered the relationship between the rate of chlorine reduction and corresponding corrosion activity. Chlorine reduction or demand rates …
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Ionic liquid electrochemical processing of reactive metals
… were studied as solvents for electrochemical reactions with the intent to devise metallurgical processes for Al, Mg and Ti that are less energy intensive and operate at lower temperatures than current industrial practice. Tetra-alkyl phosphonium ILs are on the low end of the IL cost spectrum …
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Kinetic Studies of Sulfide Mineral Oxidation and Xanthate Adsorption
… mineral. The EIS results showed that the rate of reaction increases with oxidation and reduction. At moderate oxidizing potentials, the rate of reaction is too slow to replenish hydrophilic iron species leaving hydrophobic sulfur species on the surface. However, at higher potentials, iron species …
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Synthesis, Characterization and Corrosion Inhibition Investigation of substituted triazines on aluminium and mild steel in 1M HCl: Experimental and Theoretical approach
… isotherm. The adsorption isotherm indicates the reaction is spontaneous, and inhibitor molecules adsorb onto Al and MS surface through weak force (Physisorption) and chemical bond (Chemisorption). viii | P a g e Based on EIS results, the Al impedance spectra consist of capacitive loops at a …
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Stress corrosion cracking and corrosion of carbon steel in simulated fuel-grade ethanol
… process in this environment. Fifthly, the cathodic reactions of carbon steel in SFGE were also investigated to understand the oxygen and hydrogen reactions. Hydrogen uptake into the pipeline steel and the conditions of the fractures related to hydrogen embrittlement were identified and …
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Effect of oxygen availability on the corrosion rate of reinforced concrete in marine exposure zones: inference from site and lab studies
… being readily available to participate in the cathodic reaction. In the case of these specimens, the electrical resistivity of the specimens was found to be the main limiting factor in controlling the corrosion rate (and not cathodic control as with tidal and submerged specimens). As a result, …
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An electrochemical and leach study of the oxidative dissolution of chalcopyrite in ammoniacal solutions
… resulting in different proposed fundamental reaction mechanisms and kinetic understanding. A fundamental electrochemical and controlled leach study of the oxidative leaching of chalcopyrite in ammoniacal solutions has been undertaken. The study covered the following aspects: a description of …