Application examples of coated titanium anodes in corrosion protection
With its excellent electrochemical stability, high corrosion resistance, and long lifespan, titanium anodes have become one of the core materials in modern anti-corrosion engineering. UTron Technology, through the following specific cases, analyzes the innovative applications of titanium anodes in corrosion protection in three major fields.
1. Cathodic Protection Systems in Marine Engineering
In the corrosion protection project of a cross-sea bridge in Qingdao, we used platinum-iridium coated titanium anodes (MMO anodes) to build a distributed impressed current cathodic protection system. Traditional lead-alloy anodes easily passivate in seawater environments, with a lifespan of only 5–8 years. In contrast, titanium-based anodes, with selectively permeable precious metal oxide coatings, deliver stable current output in seawater with a 3.5% chloride ion concentration. On-site monitoring showed that the system's operating current density remained stable at 80mA/m², and the protection potential was maintained at -850mV (vs. Ag/AgCl). The service life is expected to exceed 25 years, reducing maintenance costs by 60% compared to traditional solutions.
In a chlor-alkali plant, the original graphite anodes had issues with high oxygen evolution potential (1.6V) and high energy consumption. We designed a ruthenium-iridium titanium anode solution, optimizing the coating technology to create a micro-porous surface structure, increasing the effective active area by 3 times. Tests showed the chlorine evolution potential dropped to 1.3V, reducing the DC power consumption per ton of alkali from 2350kWh to 2150kWh, saving more electricity annually than expected. Meanwhile, the anode lifespan extended from 8 months to 5 years, avoiding production losses caused by frequent replacements.
In petrochemical wastewater treatment, we developed a titanium-based anode doped with a tin-antimony gradient. By adjusting the molar ratio of SnO₂-Sb₂O₅ in the coating (from 3:1 to 5:1), the hydroxyl radical concentration reached 8.2×10⁻⁴ mol/L at a working voltage of 2.5V — 15 times higher than that of traditional iron anodes. After applying this technology, a refinery's COD removal rate significantly increased, and the anodes showed no significant wear even under long-term operation in chlorine-containing media.
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