- Protection against corrosion
- Complies with the VGP and VIDA regulations
- Environmentally friendly
How anodes work
Corrosion is an important issue regarding the maintenance of a vessel. The anodes protect submerged metal structures in vessels from galvanic corrosion. This form of corrosion occurs when two different metals in a conductive liquid (such as water) come close together. Anodes will make sure that the liner and housing parts don’t corrode.
Anode blocks are mostly made out of aluminium, but zinc or magnesium are other options. The traditional zinc anodes contain percentages of highly toxic cadmium, a heavy metal whose use and disposal are becoming increasingly restricted and regulated. Therefore, vessels have to change from zinc to aluminium or magnesium anodes according to the VGP/VIDA regulations. Magnesium can damage the paint layers as well due to the high potential difference. The choice between materials depends on where your vessel operates; aluminium anodes are suitable for salt water and magnesium anodes for fresh water.
According to the VGP/VIDA regulations, vessels have to change from zinc to metals (aluminium or magnesium) that are less toxic to the extent technologically feasible and economically practicable and achievable. If zinc is used after the first dry docking after 19 December 2013, then the reasons why aluminum was not selected need to be properly documented. Ship owners are advised to select aluminum or magnesium anodes where this is possible. If you need to comply with the VGP/VIDA directives, we provide environmentally friendly aluminium anodes at request.
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Jan Willem Bongers