51313-02107-What You Need to Know About MMO Coated ...
51313-02107-What You Need to Know About MMO Coated ...
The excellent stability of mixed metal oxide (MMO) coated titanium anodes have been used for almost 30 years. MMO coated titanium anodes are utilized in various environments such as seawater, brackish water, fresh water, carbon backfill, and concrete. However, many structure owners and CP engineers specify the sizes of MMO coated titanium anodes without a full understanding of their characteristics, limitations, and evaluation methods.
MMO coatings used for cathodic protection are mainly categorized into three types: iridium oxide (IrO2-x), ruthenium oxide (RuO2-x), and their mixtures. Additional materials used include titanium oxide (TiO2-x) and tantalum oxide (Ta2O5). As MMO coated anodes discharge CP current, the coating is gradually consumed. The consumption rates of MMO coatings vary based on their chemical compositions and the environment.
Typically, iridium oxide-based MMO coatings are used for oxygen evolution, whereas ruthenium oxide coatings are used for chlorine gas evolution. Recent advancements by NACE have led to modified accelerated anode life test methods using acid solutions (H2SO4, NaSO4, etc.). In particular, ruthenium coating experiences higher consumption rates under strong acid conditions, which is crucial to consider for realistic anode performance. An iridium MMO coated anode can generally provide a longer life compared to a ruthenium MMO coated anode of the same thickness in similar environments. While iridium is more costly than ruthenium, it is usually preferred when chlorine evolution is a concern.
This article will delve into the characteristics, limitations, and evaluation methods of various MMO coatings. Additionally, it will discuss the distributions of iridium and ruthenium in commercially available MMO coatings.
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MMO Titanium Anode Material for Cathodic Protection
Overview of MMO Titanium Anode Products
There are generally four MMO titanium anode products for cathodic protection: MMO titanium tubular anode, MMO titanium ribbon anode, mmo titanium mesh belt anode, and MMO flexible cable anode. This article will introduce these four types of titanium anodes in detail.
For any questions and needs, please contact us:
anber@bjhighstar.com
MMO Titanium Tubular Anode
MMO tubular anode is a kind of auxiliary anode in an impressed current cathodic protection system. It forms a cathodic protection system together with potentiostat, test pile, reference electrode, etc. It can be welded and connected to a cable, and installed in single or multiple configurations to form an anode string.
Coating System: Ruthenium/Iridium Metal Mixed Oxides
Application Areas:
- Horizontal ground beds
- Condensate tanks, heat exchangers, water treatment equipment
- Underground and ground storage tanks
- Corrosion protection of ships, roads, bridges, and buildings
The titanium anode tube, known for its light weight, long service life, and cost-effectiveness, is suitable for various environments such as soil, fresh water, saline water, and seawater. The coating type, thickness, and anode size can be customized based on required current density, environment, and design life.
Note: For more details on the MMO Anode Manufacturing Process, visit this MMO Anode Manufacturing Process.
MMO Titanium Strip Anode
Product Name: MMO Titanium Strip Anode
Specifications:
Width 6.35mm Thickness 0.635mm or Width 12.7mm Thick 0.9mm (customizable based on customer needs)
Material Composition: Titanium-based coated electrodes, welding parts
Use Environment:
- Sandy soils
- Chlorine and oxygen evolution environments
- Reinforced concrete structures
Applications: Used for external wall protection of storage tanks, these anodes can be laid directly in wet or salty sand without carbon-based filling materials. They offer excellent stability and long service life up to 50 years.
MMO Titanium Mesh Belt Anode
Product Name: MMO Titanium Mesh Belt Anode
Specifications: 0.635×6.35mm, 12.7×0.9mm (customizable)
Material Composition: Titanium-based coated electrodes, welding parts
Use Environment:
- Sandy soil
- Chlorine and oxygen evolution environments
- Tank bottoms and reinforced concrete structures
The MMO titanium anode strip produced by HS Metal demonstrates low loss rates in various cathodic protection environments and has high chemical stability, even under acidic conditions. Its service life can exceed 50 years.
MMO Flexible Cable Anode
Specifications:
Flexible cable anodes are available in diameters of 1.5mm or 3.0mm for titanium wire anodes, with a combined external diameter of 38mm. Custom lengths are available up to 1000 meters.
The flexible anodes offer uniform potential distribution, simplified construction, and high reliability, making them suitable for complex pipeline networks, high resistivity environments, and cathodic protection of buried pipelines.
For further details or to discuss your requirements, contact us:
anber@bjhighstar.com
Our experienced sales team is available to assist you in finding the best mmo titanium anode options that suit your needs.
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