MMO coated titanium anodes (Mixed Metal Oxide coated titanium), which are titanium substrates coated with a layer of precious metal oxide catalysts. It is also called Titanium MMO Anode, Titanium Mixed Metal Oxide Anode, or DSA (Dimensionally Stable Anode).
Base Material (Titanium Substrate)
Titanium Grade: Gr1 and Gr2 materials are commonly used as substrates for making titanium MMO anodes
● Grade 1: Excellent corrosion resistance, primarily used in less mechanically demanding applications.
● Grade 2: Most common grade, offering good strength and corrosion resistance for most applications.
Coating
Composition of Coating
The MMO coating is typically composed of iridium oxide (IrO₂), ruthenium oxide (RuO₂), tantalum oxide (Ta₂O₅), and/or platinum. The coating improves conductivity, corrosion resistance, and overall lifespan.
Coating Thickness
Typically ranges from 2 µm to 10 µm, although thicker coatings may be used for specific applications (up to 50 µm for extreme conditions).
Coating Method
The coatings are usually applied using thermal decomposition or electrochemical deposition methods to ensure uniformity and adhesion.
Specification
| Item | Specification |
|---|---|
| Titanium substrate | Grade 1 / Grade 2 titanium |
| Shape | Titanium mesh, plate, rod, tube, basket |
| Coating | RuO₂-IrO₂, IrO₂-Ta₂O₅, Pt-based MMO |
| Coating thickness | Usually 1–10 μm (customized) |
| Operating temperature | Generally ≤80°C (depending on coating system) |
| Current density | Approx. 100–5000 A/m² (application dependent) |
| Service life | 3–20 years depending on environment |
| Working media | Seawater, brine, acidic/alkaline electrolytes |
Electrochemical Properties
● Electrolyte Compatibility: MMO titanium is highly resistant to aggressive electrolytes like:
Chlorine (in chlor-alkali processes)
Sodium hydroxide (in caustic processes)
Sulfuric acid (in various electrolytic processes)
Seawater (in marine applications)
● Electrode Potential: MMO anodes typically have an overvoltage of 0.2-0.4 V for chlorine and oxygen evolution reactions.
● Current Density: MMO anodes can operate at high current densities, typically 1000-5000 A/m², depending on the specific application.
Performance and Efficiency
Corrosion Resistance
MMO titanium has exceptional resistance to corrosion in highly acidic and saline environments, making it ideal for electrochemical applications like chlorine production and water treatment.
Stability and Lifespan
The lifetime of MMO-coated titanium anodes is typically 5-10 years, depending on operating conditions, coating quality, and electrolyte type.
Energy Efficiency
MMO titanium anodes offer high energy efficiency, typically having a lower voltage drop than other types of anodes (e.g., graphite, lead), which translates to reduced power consumption in electrolysis processes.
Advantages of MMO Titanium
High corrosion resistance
Titanium substrate remains stable in harsh chemical environments.
Long service life
Compared with graphite or lead-based anodes, MMO titanium anodes have much longer operating life.
High current efficiency
The MMO coating provides excellent catalytic performance.
Low energy consumption
Lower electrode potential reduces power consumption.
Lightweight and strong
Titanium offers high strength-to-weight ratio and good mechanical stability.
Description
Smoothness
The surface finish of titanium MMO anode electrodes can vary, with some applications requiring a smooth, polished surface, while others may use expanded metal or mesh forms to increase the surface area and enhance electrolysis efficiency.
Porosity
For certain applications (e.g., electroplating or electrowinning), the titanium mesh may be expanded to increase surface area and improve performance.
Environmental Impact
● Non-Toxic: titanium MMO anode is generally considered safe and environmentally friendly, as it does not release harmful byproducts into the environment during electrolysis or electrochemical processes.
Applications
1) Electrochemical Industry
Chlor-alkali production
Sodium hypochlorite generation
Electrolysis systems
Water electrolysis
2) Water Treatment
Wastewater electro-oxidation
Drinking water disinfection
Seawater desalination systems
Electrochemical oxidation equipment
3) Cathodic Protection
Offshore platforms
Ships and marine structures
Pipelines
Storage tanks
4) Metal Electrowinning
Copper electrowinning
Zinc electrowinning
Nickel electrowinning
Precious metal recovery
5) Swimming Pool & Marine Systems
Salt chlorination systems
Seawater electrolysis
If customers require titanium MMO anode they are welcome to contact our sales team directly for further information, quotations, or technical support by sending an email to sale@cntitaniumtop.com, and our team will respond promptly to assist with their requirements.
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