MMO Disc Anode
Application area; Cathodic protection of ocean hulls
Specifications:diameter 25/60/100/150mm,and customized requirements.
Product performance:seawater/500-600A / m2 /20 years.
Freshwater and soil at 100A / m2
Coating system: IrO2/Ta2O5 mixed metal oxide & Platinum
Accelerated Life Test Standard: NACE TM0108-2008
Product Introduction
MMO disc anodes are manufactured using a titanium disc substrate conforming to ASTM B265 Grade 1 or Grade 2, coated with Mixed Metal Oxide (MMO) or Platinum-based catalytic coatings. The MMO coating typically consists of IrO₂/Ta₂O₅ mixed metal oxides, which provide excellent electrocatalytic activity and long-term stability.
These anodes are designed for efficient direct current transfer through a highly conductive catalytic layer, enabling high current output with low consumption rate and excellent electrochemical performance.
They were originally developed for demanding cathodic protection applications in dams, navigation locks, and marine environments, where long service life and stable current distribution are critical.
Working Principle
The titanium substrate is naturally passivated by a stable oxide layer, while the MMO coating provides the active electrochemical surface. This combination ensures:
Low anode consumption rate
Dimensionally stable performance over time
High and uniform current distribution
With optional sealing spacers or gasket systems, disc anodes can also be installed on:
Internal pipe surfaces
Storage tanks
Curved or confined structures
Key Features
Excellent corrosion resistance
Stable electrocatalytic activity
High current efficiency
Long service life
Uniform current distribution
Suitable for harsh marine and soil environments
Specifications
Disc Model | Diameter (mm) | Current Rating (A) |
φ25 | 25 | 0.3 |
φ60 | 60 | 1.7 |
φ100 | 100 | 4.7 |
φ150 | 150 | 10.6 |
Note: Values are for reference only. Actual performance depends on site conditions.
Application Areas
Cathodic protection of ship hulls
Offshore marine structures
Navigation locks and dams
Water storage tanks and vessels
Buried or submerged steel structures
Industrial pipelines and infrastructure
Coating System
IrO₂ / Ta₂O₅ mixed metal oxide coating
Optional platinum-based coating systems
Accelerated Life Test Standard
Standard: NACE TM0108-2008
Test medium: 1 mol/L H₂SO₄
Current density: 10,000 A/m²
Accelerated lifetime: > 73 days (minimum requirement met/exceeded)
Maximum Current Density
Environment | Max Current Density (A/m²) |
Seawater | 600 |
Brackish water | 300 |
Fresh water | 100 |
Manufacturing Process
Raw material → Shearing → Machining → Welding → Blasting → Pickling → Coating → Inspection → Packaging
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