Mixed Metal Oxides (MMO) Coated Tubular Anode String-IMPRESSED CURRENT ANODES-YUXI Corrosion Control

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Mixed Metal Oxides (MMO) Coated Tubular Anode String

This anode string is comprised of electrical cable threaded through multiple MMO tubular anodes. The MMO tubular anode is generally titanium tubes coated by an electrocatalytic film of noble metal oxides. The mixed metal oxide coating, with industrially proven lifetime characteristics, ensures an even current distribution along the anodes length. As a highly conductive anode with extremely low consumption rate, the anode string remains dimensionally constant throughout the design life. They are widely used in deep wells to protect the underground pipe among other steel structures. For improved current output of MMO tubular anodes, coke breeze is commonly used in anode beds, or the anodes are prepackaged in canisters containing carbonaceous backfill ready for installation.

PRODUCT INTRODUCTION
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Quality Substrate Material

Our tubular anode is manufactured from high-tensile seamless titanium tube, which meets ASTM B338 Grade 1 standards.

Element	Grade I	Grade II
Iron (Fe)	0.20% max.	0.30% max.
Carbon (C)	0.08% max.	0.08% max.
Nitrogen (N)	0.03% max.	0.03% max.
Hydrogen (H)	0.015% max.	0.015% max.
Oxygen (O)	0.18% max.	0.25% max.
Single Impurity (Each)	0.10% max.	0.10% max.
Other Impurities (Total)	0.40% max.	0.40% max.
Titanium (Ti)	Remainder	Remainder

Noble Metal Oxide Coating

The Ir–Ta (IrO2/Ta2O5) mixed metal oxide catalyst sintered to the surface of titanium substrate demonstrates high chemical stability when subject to high current density. We can produce anodes with differing coating thickness and noble metal oxide ratios upon request. Strict quality control procedures are followed throughout the coating process to ensure appropriate coating thickness and adhesion. Based upon accelerated life testing, conducted by an independent laboratory, our MMO coating has been proven to have an increased life expectancy when compared with other similar products on the market.

◉ Ir–Ta Mixed Metal Oxide Catalyst

The iridium-tantalum mixed metal oxide catalyst is recommended for use in soil or fresh water, where there is either no
chloride ions or low chloride ions present.

Technical Measurement	Performance
Coating Element	IrO₂, Ta₂O₅
Coating Thickness	5~10 μm
Coating Uniformity	85% min.
Working Environment	Fine sand, Coke Breeze, Freshwater

◉ Ir–Ru Mixed Metal Oxide Catalyst

The iridium-ruthenium mixed metal oxide catalyst can be used in seawater, brackish water, mud, concrete and any other severe environment conditions including high acidity or in the presence of chlorine or oxygen.

Technical Measurement	Performance
Coating Element	IrO₂, RuO₂
Coating Thickness	5~10 μm
Coating Uniformity	85% min.
Working Environment	Mud, Concrete, Seawater

* We can produce anodes with different nobel metal oxide ratios and differing coating thickness as specific required.

Low Electrical Resistance

The anode has an extremely low consumption rate, measured in milligrams per ampere-year. The dimensions remain nearly unchanged throughout the design life of the anode, providing a consistently low resistance.

Wide Cable Selection

PVDF, HMWPE, HALAR, XLPE, PVC or KYNAR are all optional. We recommend dual-insulated cable(such as PVDF/HMWPE) for use in ground beds with high chloride concentration. While HMWPE is an economical choice for shallow vertical and horizontal surface beds with no chlorides.

MMO Tubular Anodes Datasheet

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