Overview
Titanium-based coated anodes are specialized electrodes consisting of a titanium substrate coated with a thin layer of mixed metal oxides (MMO), such as ruthenium or iridium oxides. These anodes are designed to withstand aggressive electrochemical environments while maintaining stable performance over extended periods. Their development in the 1960s revolutionized industries like chlor-alkali production by replacing graphite anodes, offering superior efficiency and durability. Today, they are critical in applications requiring precise current distribution and resistance to corrosive media. The titanium substrate provides mechanical strength, while the catalytic oxide coating ensures optimal electrochemical activity and minimizes energy consumption.
Physical and Chemical Properties
The titanium substrate grants the anode lightweight properties (density ~4.5 g/cm³) and high melting point (1668°C), while the oxide coating (typically 5–20 µm thick) provides catalytic activity. The coating’s composition (e.g., RuO2-IrO2) determines its conductivity and corrosion resistance, with some formulations stable in pH ranges from 0 to 14. Key electrochemical properties include low chlorine/oxygen overpotential and high current efficiency (>90%). The anodes exhibit minimal dissolution rates (<0.1 µg/A·hr) in chloride environments, ensuring longevity. Their thermal expansion coefficient matches that of titanium, preventing delamination under thermal cycling.
Main Applications
In the chlor-alkali industry, these anodes enable efficient chlorine production with reduced energy costs. They are also integral to cathodic protection systems for offshore platforms and pipelines, where their immunity to seawater corrosion extends service life to 10+ years. Electroplating and electrowinning operations benefit from their uniform current distribution, which improves deposit quality in copper/nickel refining. Water treatment applications include electrochemical oxidation of pollutants and disinfection via hypochlorite generation. Specialty uses include organic electrosynthesis and fuel cell technology.
Safety and Storage
The oxide coating is fragile; avoid physical impact or abrasive cleaning. Exposure to hydrofluoric acid or concentrated sulfuric acid can degrade the coating. Store anodes in original packaging, away from humidity and corrosive fumes. During installation, use compatible gaskets (e.g., PTFE) to prevent galvanic corrosion. Regular voltage monitoring is advised to detect coating wear. Spent anodes should be recycled for titanium recovery, as the precious metal coating has residual value.
B2B Procurement Guide
Specify the electrolyte composition (e.g., chloride concentration, pH) and current density (typically 500–1500 A/m²) to guide coating selection. For seawater applications, iridium-rich coatings are preferred, while ruthenium-based coatings suit chlor-alkali cells. Verify supplier testing data, including accelerated life tests (e.g., ASTM D3087). Lead times may vary due to custom coating processes. Bulk orders (50+ units) often qualify for 10–20% discounts. Consider total cost of ownership, as premium coatings may reduce long-term replacement costs.
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