DEFINITION OF AN ANODE. âAn ingot of sacrificial metal attached to the underwater hull of a narrowboat or canal boat which corrodes due to electrolysis more readily than the hull and propeller. Magnesium anodes are used for boats in fresh water.Aluminium anodes are used for boats in brackish water.nodes will offer protection based on the Noble Series of metals. The theory is that by attaching a piece of metal to the hull that is more reactive than the hull itself then this piece of metal will corrode first. For our inland waters we use sacrificial magnesium anodes for protection.
Pure water is an insulator, since it doesn't contain any charged particles to act as conductors. However, water is an excellent solvent for charged particles like salts, so it's unheard of to find pure water in nature.
Most commonly, a special type of conductivity, called specific conductivity, is used. Conductivity Technology. Conductivity and salinity are both measured by an electric probe on the data logger. This probe measures how much electrical current moves through the water. Salinity is then calculated from this value. Conductivity is determined by measuring how easily an electrical current flows between two metal plates.