Titanium Anode Mesh for Swimming Pool Disinfection: Performance, Process & Application Guide

In swimming pool water treatment, the stability and sterilization efficiency of the disinfection system directly affect water quality and operating costs. Currently, titanium-based mixed metal oxide coated anodes have become the core component of electrolytic disinfection systems. This article systematically introduces the key aspects of this critical component, including material selection, technical parameters, manufacturing process, and sterilization mechanism.

1. Substrate and Coating System

Substrate Grade: TA1 (Gr1) or TA2 (Gr2) industrial pure titanium. Both grades offer excellent corrosion resistance. Gr1 has better plasticity and is suitable for mesh structures. Gr2 has slightly higher strength and is ideal for larger plate-shaped anodes.

Coating Composition: A mixed precious metal oxide layer of iridium oxide (IrO₂) + ruthenium oxide (RuO₂). This combination provides both high oxygen evolution potential and low chlorine evolution potential, maintaining stable electrocatalytic activity even at low salt concentrations (0.3%~0.5%). It also significantly outperforms single-layer coatings in resistance to polarization corrosion.

Application Process: Multi-step procedure including sand blasting → acid washing → brush coating → thermal oxidation decomposition. This creates a metallurgical bond between the oxide coating and the titanium substrate, ensuring a dense, highly adhesive coating with a controllable thickness range of 8~20μm.

2. Key Performance Specifications

Parameter	Typical Range	Design Significance
Coating Thickness	8~20μm	Balance between durability and adhesion
Operating Life	10,000–18,000 hours	Equivalent to 3.4–6.2 years at 8h/day operation
Current Density	≤300 A/m²	Prevents accelerated coating consumption
Warranty	5 years	Based on real-world accelerated life testing
Salt Concentration	0.3%~0.5%	Optimal range for chlorine generation
Coating Area	Double sides	Maximizes active surface area

Customizable Shape: Available as plate or mesh. The mesh structure is preferred for swimming pool circulation systems due to its higher specific surface area and lower flow resistance. Dimensions are fully customizable according to customer drawings or requirements.

 

3. Electrolytic Sterilization Mechanism

When swimming pool water containing sodium chloride (0.3%~0.5%) passes through the titanium anode mesh under a DC electric field, the following reactions occur:

Anode: 2Cl⁻ → Cl₂ + 2e⁻. The generated chlorine immediately hydrolyzes to form hypochlorous acid (HClO)

Cathode: 2H₂O + 2e⁻ → H₂ + 2OH⁻, helping to stabilize pH

Hypochlorous acid is a broad-spectrum biocide. It rapidly inactivates the following typical waterborne pathogens:

Bacillus subtilis (resistance indicator)

Pseudomonas aeruginosa (common opportunistic pathogen in pools)

Vibrio cholerae, Salmonella typhi

Shigella species, Salmonella species, Escherichia coli

Additionally, the electric field treatment helps prevent scale deposition, breaks down existing old scale, and reduces the frequency of chemical cleaning.

4. Applications and Customization

This titanium anode mesh is suitable not only for standard swimming pools but also for:

Domestic water disinfection in high-rise building water tanks

Hot spring water circulation systems (sulfide concentration must be monitored)

Algae and bacteria control in small-to-medium landscape water bodies

Customization process: The customer provides required dimensions (length × width × thickness) and connection method (monopolar or bipolar). The manufacturer calculates the anode area and spacing based on the current density ≤300A/m².

5. Manufacturing Process Reference

Taking professional titanium anode manufacturers in the Baoji area (e.g., Di Noer Technology Co., Ltd.) as an example, production strictly follows these steps:

Sand blasting – Removes surface oxide scale and creates uniform roughness

Acid washing – Activates the titanium substrate and improves wettability

Brush coating – Precisely controls the amount applied per layer

Thermal oxidation – Each layer is baked at approximately 450–550°C

Repeat coating – Until the target thickness (8–20μm) is reached

Before shipment, each anode undergoes accelerated life testing at 300A/m² to ensure continuous operation without failure in simulated swimming pool water (30°C, 0.4% NaCl).

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Summary

When selecting a titanium anode mesh for swimming pool disinfection, pay close attention to the following:

Substrate grade (Gr1 or Gr2)

Coating composition (IrO₂ + RuO₂)

Coating thickness (≥8μm)

Maximum allowable current density (≥300A/m²)

A mesh-shaped anode produced via the brush coating and thermal oxidation process offers both long operating life and high sterilization efficiency. It is a preferred solution for electrolytic disinfection systems in small-to-medium swimming pools.

 

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