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Kinetics & mechanism of trivalent chromium deposition

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PROT Study of partial reactions in amino-acetic acid sol'n show that reduction of Cr(II) to Cr(0) is faster than preceding step. A limiting current density which is pH dependant was established. The role of hydroxy complex formation is established.

Kinetics & thermodynamics of copper powder production at rotating iron cylinder in mixed solvents

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Cementation kinetics (displacement reaction) of iron by copper in methanol & DMSO were studied in terms of temperature, rotation rate & electrolyte composition. Enthalpies & free energies & entropies of reaction are derived, rate constants are listed. 24 refs

Kinetics and Initial Stages of Bismuth Telluride Electrodeposition.

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JES

Kinetics and mechanism of anodic oxidation of cadmium in acid phosphate solutions

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Processes of electrochemical phosphating (phosphate passivation) providing means of explaining certain empirically found phosphating laws are studied, and general theory of process is established. It is found that over pH range 3.0 to 5.4 rate of anodic dissolution of Cd is directly related to overall phosphate concn. and is independent of pH. Stepwise mechanism of anodic process is proposed, including slow electrochemical stage of specific adsorption of dihydrophosphate ion with formation of intermediate surface complex and rapid stage of passage into solution.

Kinetics and Mechanism of Chromium Electroplating from Cr(III) Baths

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Kinetics and Mechanism of Electroduction of Palladium (II) Complexes.

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RUS

Kinetics and mechanism of electroless metal deposition

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JES Review surveys kinetic and mechanistic aspects of electroless deposition of Cu, Ni, Co, Au and Pd using formaldehyde, hypophosphite, hydrazine, borohydride, and aminoboranes as reducing agents. Electrochemical and nonelectrochemical theories are discussed. Electrochemical theories are discussed in 2 sections: (i) fundamentals of mixed potential theory and (ii)kinetics and mechanism of anodic and cathodic partial reactions. Nonelectrochemical theories of electroless deposition of Ni by reduction with hypophosphite are discussed.

Kinetics and Mechanism of Palladium Electrodeposition from Alkaline Solutions of Palladium(II) Bisethylenediamine Complexes

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RUS Abstract avail. online. (R)

Kinetics and Mechanism of Palladium Electrodeposition from Alkaline Solutions of Palladium(II) Bisethylenediamine Complexes

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RUS Abstr. avail. online (RE)

Kinetics and Mechanism of the Formation of Doped Skeletal Copper Catalysts: the Effect of Zincate Compared to Undoped and Chromate-doped Systems

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JAE

Kinetics and Mechanism of the Hydrogen evolution Reaction on Titanium in Acidic Media.

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JES The effects of potential and pH on the rate of the H evolution reaction on zone-refined Ti were detd. in acidic sulfate and chloride media at ph 0-4.0. In all cases, the cathodic Tafel slope is -129 mV, i.e. (aE/alog[i])pH = 2(2.303RT/F). The reaction order with respect to proton activity, (-alog[i]apH)E, exhibits a min. value of 0.4 at pH 1.83 and increases to a limiting value of 1.0 with increasing or decreasing pH. A mechanism in agreement with the aforementioned observations is proposed. The mechanism consists of 2 parallel paths for rate-detg. proton discharge, one path involving the usual solvated proton and the other involving the adsorbed surface species (TiOH)+ads. followed by the fast recombination reaction. Langmuir adsorption kinetics apply to the adsorbed H atoms. The proposed mechanism is consistent with what is known concerning the effect of potential upon the rate of adsorption of H by the metal. The mechanism is also consistent with the mechanism of active-state dissoln. and passivation of Ti in acidic media, i.e., the hypothetical existence of a 3-dimensional phase oxide (as opposed to adsorbed oxy and hydroxy Ti Species on the submonolayer level) on Ti in the active state is rejected.

Kinetics and Mechanism of the Preparation of Raney Ebonex Copper

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JAE

Kinetics and Mechanism of Thermal Oxidation of Electroless Nickel-Boron and Ni-B-Tungsten Alloys.

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Kinetics and Mechanism of Thermal Oxidation of Electroless Nickel-Boron and Ni-Tungsten-B Alloys.

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Kinetics and Mechanism of Thermal Oxidation of Electrolessly Deposited Nickel-Boron and Ni-Tungsten-B Alloys.

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