Preparation and Characterization of Mixed Metal Oxides Coatings on Titanium Substrate

Badawy, Abdel-Aziz; Bekhit, Samah; El- Nashar, Rasha; Heakal, Fakeyha; Ghayad, Ibrahim Mohamed

doi:10.21608/ejchem.2024.295803.9830

Preparation and Characterization of Mixed Metal Oxides Coatings on Titanium Substrate

Document Type : Original Article

Authors

¹ October High Institute for Engineering & Technology, Giza 12596, Egypt.

² corrosion control and surface protection department, metal technology institute, central metallurgical research and development institute

³ Chemistry Department, Faculty of Science, Cairo University

⁴ Corrosion Control & Surface Protection Lab., Metals Technology Dept., Central Metallurgical Research and Development Institute

10.21608/ejchem.2024.295803.9830

Abstract

RuO2-IrO2-TiO2 and RuO2-IrO2-TaO2-TiO2 are the most common mixed metal oxide (MMO) coatings coated on Ti substrates. MMO-coated titanium substrates serve as anodes in brine electrolyzers, which employ highly concentrated brine (33% NaCl) to generate chlorine gas and sodium hydroxide. These MMO electrodes were deposited using precursors that included ruthenium trichloride trihydrate (RuCl3.3H2O), diammonium iridium hexachloride [(NH4)2IrCl6], tantalum pentachloride (TaCl5), and titanium trichloride (TiCl3). Highly effective RuO2-IrO2-TiO2 and RuO2-IrO2-TaO2-TiO2 MMO coatings with the appropriate chemical composition were achieved. Both electrodes performed efficiently and showed high stability in the accelerated stability test, while tantalum in the coating composition enhances the MMO coating’s stability.

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