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Anodes with mixed metal oxide (MMO) coating mostly consist of the base material titanium onto which precious metal oxides of the platinum metals group with other valve metals are applied. Usually iridium mixed oxide coatings are used for chloride-free electrolytes, whereas ruthenium or iridium/ruthenium mixed oxide coatings are used for the production of chlorine and hypochlorite.
In case of special wear caused by high current density or current reversal, additional metallic or ceramic intermediate layers can be applied.
MMO anodes are characterised by the following features:
- Flexible, application-specific design
- Production of complex shape anodes possible
- Easy handling, low maintenance
- Energy saving potential
- Current reversal operation possible
- Low weight (in particular expanded metal anodes)
- Long lifetime even at very high current density
- Dimensional stabiliity
- Recoating possible
