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Effect of heat treatment of titanium substrates on the properties of IrO_2-Ta_2O_5 coated anodes

Rare Metals 2011年第5期30卷 439-446页

作者： YAN Zhenwei MENG Huimin Corrosion and Protection Center Laboratory for Corrosion-Erosion and Surface Technology University of Science and Technology of Beijing Beijing 100083 China

The Ti substrates of IrO 2 -Ta 2 O 5 coated anodes were treated by solid-solution and aging, stress relieving annealing, and recrystallization annealing, and the coatings were prepared by thermal decomposition of a mixture of H 2 IrCl 6 ·6H 2 O dissolved in hydrochloric acid and TaCl 5 dissolved in alcohol. Scanning electron microscopy （SEM）, cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS）, and accelerated life test （ALT） were employed to study the microstructure and electrochemical properties of the anodes. Compared with the anode without heat treatment, the anodes with heat treatment are of higher electrochemical activity and longer accelerated life; especially, the anode with recrystallization annealing treatment has the best electrochemical properties and the longest accelerated life.

关键词： anode materials oxides titanium thermal decomposition substrates heat treatment electrochemical properties accelerated life

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ELECTROCHEMICAL PROPERTIES AND MICROSTRUCTURE OF Ir-Ta-Ti METAL OXIDE COATED TITANIUM ANODES

引用

Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 457-462页

作者： T. Y. Wang, L.K. Xu and G.Z. Chen (Qingdao Branch of Luoyang Ship Material Research Institute, Qingdao 266071, China) Qingdao Branch of Luoyang Ship Material Research Institute

Ir-Ta-Ti metal oxide coated titanium anodes prepared by thermal decomposition at different calcination temperatures were characterized by scanning electron microscopy, cyclic voltammetry, and accelerated life test, while the consumption rate of an anode was also measured in seawater. The SEM results indicate that all oxide layers exhibit a cracked-mud morphology influenced by calcination temperature. Voltammetric charge (q), obtained by integration of I-E curve, is proportional to the number of surface active sites, and can be taken as a measure of the active surface area of oxide layer. It is found that q* decreases linearly with the increase of calcination temperature, and reaches a maximum at 450℃. The anode prepared at 500℃ possesses the best anodic stability and the longest service life in 1M H2 SO4 at an anodic current density of 2A/cm2. Owing to good corrosion resistance and low consumption rate in seawater, Ir-Ta-Ti metal oxide coated titanium anodes belong to insoluble material with excellent electrocatalytic activity, which are outstanding candidates for using as anode in impressed current cathodic protection systems.

关键词： anodic stability accelerated life consumption rate cyclic voltammetry

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