Titanium Anode for Chlor-alkali Industry

Titanium anodes play a vital role in the chlor-alkali industry, one of the most highly corrosive electrochemical processes. This process involves aggressive media such as saturated brine (NaCl), sodium hydroxide (NaOH), chlorine gas (Cl₂), and hydrochloric acid (HCl), creating a strongly oxidizing and corrosive environment.

Modern chlor-alkali production primarily adopts the ion membrane cell process, where titanium-based mixed metal oxide (MMO) anodes are essential for efficient and stable operation.

Product Overview

Substrate: Grade 1 Titanium (Gr1) Mesh

Coating Type: Ruthenium–Iridium (Ru/Ir) Mixed Metal Oxide

Structure: Mesh, plate, or customized multi-plate anode assemblies

Design Options: Cage-type, monopolar, or multi-element configurations

Key Electrochemical Performance

Operating Conditions

Electrolyte: Saturated NaCl solution (~35%)

Current Density: ~1000 A/m²

Electrolysis Method: Ion membrane process (separate anode & cathode chambers)

Coating System: Titanium-based RuO₂–IrO₂

Service Life: ≥ 5 years

Accelerated life testing is conducted under high current density conditions (up to 20,000 A/m²) in accordance with industry standards such as HG/T2471-2007.

Function in Chlor-Alkali Process

During electrolysis of brine:

Anode reaction:
Chlorine gas (Cl₂) is generated

Cathode reaction:
Hydrogen gas (H₂) and sodium hydroxide (NaOH) are produced

Titanium MMO anodes significantly improve the efficiency of chlorine evolution while maintaining dimensional stability.

Advantages Over Traditional Graphite Anodes

Lower chlorine evolution potential → reduced energy consumption

Minimal consumption → longer service life

Stable geometry → consistent electrode spacing

Higher chlorine purity

No contamination of electrolyte

Superior corrosion resistance in harsh chemical environments

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