Achtzehnmorgenweg 3
D-61250 Usingen
Fon: +49 - 6081 - 10 60 - 0
Fax: +49 - 6081 - 10 60 - 60
eMail: info@metakem.de

General

METAKEM is one of the leading suppliers of coated titanium and niobium anodes in a large variety of sizes and forms. The great advantages of METAKEM’s anodes are

• Deliverable in different forms

• Constantly active surface and dimensional stable

• Reduced environmental burden and reduced maintenance

• Excellent throwing uniformity

• Energy savings through well shaped anodes and small anodes/cathodes distances

As base material we are offering 8 standard mesh type metal types A - H, which you will find in the picture 1.

Also available are metal plates, rods, tubes and wires in different sizes and forms.

METAKEM is able to supply anodes in very short times depending on the kind of anode and the delivery destination.

All layers like Platinum and Mixed Oxide are porous, independent of the production method. Furthermore the layers are not homogeneous. Especially the areas of the short angles of mesh metals which will be cover with a thinner layer as elsewhere. Therefore the declared layer thickness is only an indicative average over a large mesh area and is expressed in noble metal/m². The calculated layer thickness cannot be guaranteed everywhere.

Platinised Anodes for the Electroplating Industry

consist of a titanium or niobium base with a platinum layer of 2-5 m. This layer will be deposted in a electrolytic bath.

Platinised anodes should only be used in electrolyts which do not destroy the platinum layer and/or the base metal. That means platinised anodes must not used in baths at very high or very low pH values or in baths with fluoride contents over a certain limit.

The life circle time of platinised anodes is dependent on different factors: Kind and quality of the electrolyt, current density, basis metal, adhesion and porosity of the layer.

In chrome baths the platinum consumption usually varies between 1-6 g per million Ah. The platinum consumption in noble methal bath is higher. Neverthenless because of the low current densities lifetimes of several years will be achieved.

Mixed oxide coated anodes consist of a titanium base activated with a coating of a mix mainly of platinum metal group oxides. Usually ruthenium and iridium are used, either each metal alone or together. The composition of the activating layer is adapted to the specific electrolytical process. Different coatings are chosen for the production of chlorine and for oxygen.

The mixed oxide coating are produced by the pyrolyte depositing a large number of layers, one upon the other, each layer only part of a micron thick. The layer obtained is characterized by a small internal resistance, high loading capacity for the electrical current, a constant anode potential over the anode life and a low wear rate. The consumption of the coating depends on current density, temperature and composition of the electrolyte. Reliable forecasts of longevity are difficult to make. It is recommended to evaluate anode consumption in practical operation or in representative laboratory test.

The iridium-based anode by METAKEM is most suitable for oxygen production and possesses a high longevity even if chlorine is produced. The classical ruthenium/ titanium oxide anode should only be used for chlorine production.

Mixed oxide coated anodes can be used for most applications where platinised titanium is normally used, except for chromium plating baths. Mixed oxide coated anodes do not cover themselves with a lead dioxide layer, which is necessary for the oxidation of Cr(III) to Cr(VI).