MMO (Mixed Metal Oxide) Titanium is a type of titanium used in electrochemical applications, particularly as an anode material in electrolysis processes. The titanium substrate is coated with a mixture of metal oxides, such as iridium, ruthenium, and tantalum, which significantly improve its electrical conductivity, corrosion resistance, and overall performance.
Base Material (Titanium Substrate)
Titanium Grade: Common grades for MMO titanium include Grade 1, Grade 2, and Grade 5 titanium.
● 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.
● Grade 5 (Ti-6Al-4V): High-strength titanium alloy for demanding mechanical applications, but less commonly used for MMO coating.
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.
Dimensions
Electrode Surface Area: MMO titanium anodes are available in a variety of sizes, from small laboratory-scale plates (e.g., 10-50 cm²) to large industrial plates (e.g., 1-2 meters in length and up to several square meters of electrode surface area).
Thickness of Titanium Substrate: Typically ranges from 1 mm to 5 mm, depending on the application.
Electrode Shape: MMO titanium can be manufactured in different forms, such as:
● Plates
● Meshes
● Rods
● Tubes
● Expanded metals
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.
Durability and Operational Parameters
● Temperature Range: MMO titanium anodes can operate in temperatures ranging from 0°C to 100°C, though some high-performance coatings can withstand higher temperatures (up to 200°C or more in specialized applications).
● Pressure: MMO titanium anodes can typically withstand pressures up to 30 bar, depending on the design and coatings.
Description
Smoothness
The surface finish of the MMO titanium 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: MMO titanium is generally considered safe and environmentally friendly, as it does not release harmful byproducts into the environment during electrolysis or electrochemical processes.
Applications
● Electrolysis: MMO titanium anodes are commonly used in industrial electrolyzers, including:
Chlor-alkali electrolysis (chlorine production)
Water electrolysis (hydrogen production)
Electrochemical cells for wastewater treatment
Electrowinning and electrorefining of metals
● Electroplating: Used in electroplating applications for depositing various metals onto substrates.
● Cathodic Protection: MMO-coated titanium is sometimes used in cathodic protection systems to prevent corrosion of metal structures in seawater and underground environments.
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