The use of cathodic protection by galvanic anode is an effective and long used method to fight against corrosion of metal structures immersed at sea (e. g. ships, docks on piles, offshore platforms…). The oxidation of these anodes, often composed of zinc or aluminium, causes the release and diffusion of metal elements in the form of ions or oxyhydroxides. With the development of ORE, the question of the effects of anode degradation has reappeared in civil society and been relayed by government departments, so it is important to be able to provide scientifically substantiated answers to this question.