The MMO titanium anode is a high-performance electrode material based on titanium and coated with mixed metal oxides (such as oxides of precious metals like ruthenium and iridium) on its surface. It is widely used in fields such as electrolysis, cathodic protection, water treatment, and the chlor-alkali industry, and possesses significant advantages such as strong corrosion resistance, long lifespan, and high electrocatalytic efficiency.
1. Core structure and working principle
The MMO titanium anode is composed of two major parts:
Titanium substrate: Typically, commercially pure titanium (such as TA1/TA2 or ASTM B265 Grade 1 titanium) is used, which possesses excellent corrosion resistance and mechanical strength, enabling long-term stable operation in harsh environments.
Mixed metal oxide coating: A conductive layer with high electrocatalytic activity is formed on the surface of a titanium substrate by coating oxides such as RuO₂, IrO₂, and Ta₂O₅ through processes such as thermal decomposition. This coating not only exhibits good conductivity but also remains stable in environments with strong acids, strong alkalis, and high current densities.
This combination of "titanium substrate + precious metal oxide" makes the MMO anode almost non-consumable during the electrolysis process, hence it is referred to as a "dimensionally stable anode" (DSA).
II. Main Types and Application Scenarios
Based on different structures and applications, MMO titanium anodes can be divided into the following categories:
Tubular anode: It is suitable for deep-well cathodic protection systems and commonly used for corrosion protection of underground facilities such as long-distance pipelines and tank bottom plates. Its structure includes a titanium tube anode, coke filler, and a gas conduit, which can effectively solve the "gas blockage" problem and provide a wide protection range.
Plate/mesh anode: It is commonly used in electrolytic cells, wastewater treatment equipment, sodium hypochlorite generators, etc., featuring uniform current distribution and convenient installation.
Ribbon/flexible anode: It can be bent and laid, suitable for cathodic protection in complex pipe networks or areas with damaged coatings, especially in high-resistance soil environments.
Customized structure: We support the production of special forms of anodes, such as filamentous and three-dimensional structures, based on customer equipment space and fluid dynamics requirements, to meet emerging applications such as hydrogen-rich water cups and hydrogen production through electrolysis.
