Electrochemical protection of the tube bundle in circulating water heat exchangers
Thread Content
The magnesium anode installed in the figure below protects the water cooler tube bundle (where water flows inside the tubes) from water corrosion. It mainly provides comprehensive protection for the water cooler tube bundle, which already has an anti-corrosion coating, to prevent corrosion. Generally, after several years of use following anti-corrosion treatment, the protective coating on the tube bundle becomes damaged; as a result, there are large cathodes and small anodes, which makes the tube bundle more prone to damage. Therefore, using this method can extend the service life of the tube bundle. However, it is not recommended to use this method on pipes without a protective coating.
A few actual photos related to sacrificial anodes are provided for reference. Two of them are for those that have undergone coating anti-corrosion treatment; these are the images taken after 4 years. Tube bundle coating for corrosion protection + sacrificial anode – the effect is very significant. Circulating water side. The views of expert Wang Wei are consistent with our actual experience in use.
Thank you to the original poster for sharing this. I also would like to ask why cathodic protection is not recommended for heat exchangers that lack a coating
In the last picture of the heat exchanger tube bundle, it can be seen that there is a coating on it; is that the condition after it was disassembled four years later? It’s too clean