Hi there, Can anyone tell me if this is right. If I were to have an aluminium boat and I want to give the hull cathodic protection what metal would I use. I said that I would use a more active less noble metal such as zinc. by placing the zinc it becomes the sacrifial anode and the hull is the cathode and we all know that the anodes corrode. is this the right idea or am i wrong. As well two metals not to use would be silver and copper. is this right. Thanks for the advice!!!