Anode Systems
by Drymat
The latest version of Standard 3355 of 03/2017, which applies to our dehumidification procedure, prescribes the use of anodes that meet the requirements regarding cathodic corrosion protection.
The highest quality with respect to the longevity of the anodes is required in bridge construction. Here, only titanium with an appropriate noble-metal activation coating is used.
We therefore use titanium with an iridium or platinum activation coating for anodes, cathodes, all screw connections as well as cables.
According to the literature from Lida, the life expectancy of such an anode at a current density of 110 mA/m² is greater than 100 years. According to Standard 3355, the current density in our application is limited to 5–8 mA/m², which makes the service life is correspondingly high.
By using a built-in resistor, an optimal power output can be ensured. This resistor prevents major alterations of the current output and enables a higher average current density than in case of large anodes having no series resistor.
Several anodes can be connected to a single supply cable, which greatly simplifies the installation procedures. A titanium screw goes through the cable insulation and thus easily forms a reliable fastening. The wire therefore does not have to be stripped but just placed into the anode head. Owing to a torque tool, the screw connection is established with a precision of 1.2 NM. By using a micro-mesh, the electrical conductance between the primary anode and the certified mortar is greatly improved.
By using the same materials for cables, screw contacts, anodes and cathodes, such things as stress corrosion, formation of copper sulphate and failure of the system are de facto excluded.
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