| MIXED METAL OXIDE [MMO] ANODE COATING
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MMO [Mixed Metal Oxide] Coating has been designed for use in all cathodic protection applications. It consists of IrO2 / Ta2O5, suitable for use in soils, carbonaceous backfill, fresh and brackish water, seawater and concrete. Mixed metal oxide coating is generally accepted by the cathodic protection industry to be satisfactory for both chlorine and oxygen evolving electrolytes.
Production of a quality product is fundamental in every step of the manufacturing process. Strict quality control procedures are followed throughout the coating process to nsure proper coating adhesion and loading. Based on accelerated life testing conducted by an independent laboratory, Ti's MMO coating has proven superior to other mixed metal oxide coatings currently being used. A copy of this test report is available upon request.
MMO coating is produced by applying solutions containing the precursor materials to the specially treated titanium substrate. It is then thermally treated at elevated temperature to convert the precursor materials to their oxides. This paint - stove process is repeated many times until the desired total loading of the MMO coating is obtained. The process achieves very good adhesion properties between the coating and the substrate through mechanical and chemical bonding.
MMO coating greatly prolongs the life of the anode (low wear rate) and provide excellent chemical corrosion resistance such as acid condition. The standard outputs are as below. However, MMO loading may be adjusted to suit a particular current density or design life.
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| Electrolyte |
Maximum Current Density |
Anode Life |
| Carbonaceous Backfill |
50 A/m2 |
20 years |
| Calcined Petroleum Coke |
100 A/m2 |
20 years |
| Fresh Water |
100 A/m2 |
20 years |
| Brackish Water |
300 A/m2 |
20 years |
| Sea Water |
600 A/m2 |
20 years |
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