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Understanding the Lifespan of Titanium Anodes in Chlorine Electrolysis Cells

2025-07-03

Typical Service Life

Titanium anodes (typically coated with precious metal oxides like RuO₂-IrO₂) used in chlorine electrolysis cells generally have a lifespan of 3–8 years under normal operating conditions. High-performance coatings (e.g., RuO₂-IrO₂-Ta₂O₅) can last over 10 years with optimized process parameters.


Key Factors Affecting Anode Lifespan


  1. Coating Composition: RuO₂-IrO₂ coating: Standard choice, lasts 4–6 years, but degrades faster at high current densities. RuO₂-IrO₂-Ta₂O₅ coating: Enhanced corrosion resistance, extending lifespan by 20–30%.

  2. Electrolysis Conditions: Current density: Exceeding design limits (e.g., >4 kA/m²) accelerates degradation. Temperature: High temps (>80°C) increase coating wear. Brine quality: Impurities (Ca²⁺, Mg²⁺, sulfates) cause scaling or coating corrosion. pH levels: Extreme acidity/alkalinity (pH <2 or >10) reduces stability.

  3. Operation & Maintenance: Reverse current: Power failure without proper shutdown can strip the coating. Regular acid cleaning: Removes scale but excessive cleaning damages the coating.

  4. Design Factors: Anode structure: Mesh anodes distribute current more evenly than plate anodes, improving longevity. Coating process: Plasma-sprayed coatings last longer than brush-applied ones.



Signs of Anode Degradation


  • Increased cell voltage (15–20% rise indicates coating deactivation).

  • Reduced chlorine efficiency (more side reactions like oxygen evolution).

  • Physical damage (coating peeling, exposed titanium substrate).



How to Extend Anode Life


  • Pre-treat brine: Ensure Ca²⁺+Mg²⁺ <10 ppb, suspended solids <1 ppm.

  • Optimize current density: Maintain 2–3 kA/m².

  • Regular inspections: Check coating condition every 3–6 months.

  • Use high-performance coatings: Higher IrO₂ content (≥30%) improves durability in harsh conditions.



Industry Benchmarks


  • Chlor-alkali plants: 5–7 years in diaphragm cells, 8–10 years in membrane cells.

  • Sodium hypochlorite generators: 2–3 years due to intermittent operation and poor brine quality.



Choose Reliable Titanium Anodes from N.W. HENGYI METAL

At N.W. HENGYI METAL, we specialize in high-performance titanium anodes for chlorine electrolysis, offering: ✔ Custom coatings (Ru-Ir, Ru-Ir-Ta, and other advanced formulations). ✔ Robust designs for extended service life in harsh conditions. ✔ Technical support to optimize your electrolysis process.

Upgrade your electrolysis efficiency with durable, cost-effective anodes—contact us today for a consultation!

🔗 www.nwhengyimetal.com

✉ nwhengyimetal@gmail.com

📞 +86 13891704215


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