Precautions if you using sacrificial anodes

The application environment has a great influence on the performance of sacrificial anodes. For example, zinc anodes cannot be used in environments where the ambient temperature is higher than 49 degrees Celsius; aluminum anodes cannot be used in environments where the chloride ion content is lower than 12% of the chloride ion content in seawater, that is, the soil environment. Aluminum anodes cannot be used; the capacitance of magnesium anodes is affected by the surface current density. When the output current of magnesium anodes is small and the surface current density is low, the current efficiency will be much lower than 50%. Therefore, it is not the more anodes installed. , the longer the service life. The service life of magnesium anodes is difficult to exceed 20 years, the current efficiency of zinc anodes is not affected by its output current density, and the service life can be many years.
The main reason for the failure of sacrificial anode cathodic protection is the production of a non-conductive hard shell on the anode surface, which limits the current output of the anode. In fact, the main reason for this problem is that the soil resistivity of the anode is too high or the filler is not applied properly, the current density of the anode surface is very low, and the corrosion products cannot be removed. Therefore, when designing a sacrificial anode cathodic protection system, in addition to strictly controlling the anode composition, it is necessary to select an anode bed location with low soil resistivity and add appropriate fillers.