Abstract
IrO 2–RuO 2 thin film was deposited on plasma sprayed TiO 2 buffer layer above Ti metal by the sol–gel and dip-coating method. Organic vehicle (ethyl cellulose) and lead borosilicate glass frit were added to improve the corrosion resistance of the films. Taguchi method and L 18(2 1×3 7) orthogonal arrays were evaluated in terms of current density to determine the optimal combination of the experimental parameters having the properties of the bigger the better (QC=B). The observed conditions were as follows: ethyl cellulose (0.1 Pa·s), drying temperature and time (170 °C, 20 min), heat treatment temperature and time (750 °C, 10 min), the weight ratio of IrO 2–RuO 2 powder to glass frit (99:5), final heat treatment time (120 min) and flow rate of air (5 standard cubic centimeter per minute, scc m), respectively. The current density of the films increased, as the weight ratio of the IrO 2–RuO 2 powder to glass frit decreased from 99:1 to 95:5, by 150% due to the reduction in crack density, suggesting that the addition of glass frit was effective on improving anticorrosion properties and surface microstructure of the dip-coated IrO 2–RuO 2 films.
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