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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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Dynamics of anodic process of gold electrode
in thiourea solution in the presence of sulfur dioxide
LONG Huai-zhong(龙怀中), SHU Wan-yin(舒万艮)

School of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, China

Abstract:The electrochemical kinetics equation of the oxidation of gold in thiourea solution in the presence of sulfur dioxide was given out. The kinetic parameters are determined as: the transmission coefficient β=0.477; when the reaction time is zero, the initial over potential of the oxidation of gold in acid thiourea solution is 0.267V. The dynamics of anodic process of gold electrode was studied by using Tafel plots. In the solution containing 5×10-6mol/L sulfur dioxide the activated energy is 46.11kJ/mol. When the electrode potential is higher than 270mV, the gold is oxidized by thiourea. The addition of H2SO3 can obviously improve the corrosion speed of gold.

 

Key words:  thiourea; gold; electrochemical dynamics

ISSN 1672-7029
CN 43-1423/U

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