INSOLUBLE ANODE TECHNOLOGY
ECSwiss provides you with insoluble anodes; they consist of a metal “valve” substrate, of the titanium, niobium or tantalum type, coated with an electro-catalytic layer. There are two types of coating:
Based on platinum,
Based on mixed metal oxides, commonly called MMO.
For economic considerations, titanium is generally preferred.
These two categories of titanium anodes make it possible to achieve high current densities up to 1500 A / m2, defined according to the desired lifetime, the nature and the conductivity of the electrolyte. This property is all the more interesting as it is coupled to a low electrode overvoltage.
Likewise, the “malleability” of the titanium substrate makes it possible to make custom anodes and to carry out sizing as close as possible to the customer specifications.
TiMMO anodes were first recommended as a replacement for graphite and lead anodes in the 1960s. They have since proven effective in many other applications requiring on-site production of chlorine or oxygen in more or less aggressive electrolytes (from pH 1-2 to pH 12).
In comparison with so-called soluble or semi-soluble anodes such as zinc, magnesium, graphite, or even ferro-silicon anodes, the flow of current is ensured by electronic transfer at the surface of the anode and therefore does not rely on the dissolution of the anode material.
The titanium anode therefore remains stable over time and does not constitute a consumable in electrolytic cells (constant inter-electrode space) or in cathodic protection installations.
This characteristic gives them a significant environmental advantage nowadays where the regulations on pollutant releases are more and more strict. As the titanium anodes are stable, there is no metallic dissolution in the medium concerned, therefore no residual pollution.
Platinum titanium anodes are more resistant to basic PH but more sensitive to acidic pH as well as to residual ripples in the supply and will be replaced by TiMMO anodes when the case allows.
Insoluble titanium anodes offer:
High resistance to corrosion
A large scale of current densities
Excellent dimensional stability
A long service life
Respect for the environment
An economic gain in a global vision of installation
ECSwiss remains available to study all your requests.