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2. Magnesium battery - Wikipedia

   en.wikipedia.org/wiki/Magnesium_battery

   The magnesium–air battery is a primary cell, but has the potential to be 'refuelable' by replacement of the anode and electrolyte. Some primary magnesium batteries find use as land-based backup systems as well as undersea power sources, using seawater as the electrolyte. [5] The Mark 44 torpedo uses a water-activated magnesium battery.

3. Sacrificial metal - Wikipedia

   en.wikipedia.org/wiki/Sacrificial_metal

   Sacrificial metals are widely used to prevent other metals from corroding: for example in galvanised steel. [3] Many steel objects are coated with a layer of zinc, which is more electronegative than iron, and thus oxidises in preference to the iron, preventing the iron from rusting. [4]

4. Galvanic anode - Wikipedia

   en.wikipedia.org/wiki/Galvanic_anode

   A galvanic anode, or sacrificial anode, is the main component of a galvanic cathodic protection system used to protect buried or submerged metal structures from corrosion. They are made from a metal alloy with a more "active" voltage (more negative reduction potential / more positive oxidation potential ) than the metal of the structure.

5. Cathodic protection - Wikipedia

   en.wikipedia.org/wiki/Cathodic_protection

   Over time the galvanic anode continues to corrode, consuming the anode material until eventually it must be replaced. Galvanic or sacrificial anodes are made in various shapes and sizes using alloys of zinc, magnesium, and aluminum. ASTM International publishes standards on the composition and manufacturing of galvanic anodes. [10] [11] [12]

6. Half-cell - Wikipedia

   en.wikipedia.org/wiki/Half-cell

   The typical anode reaction involves a metal atom in the electrode being dissolved and transported as a positive ion across the double layer, causing the electrolyte to acquire a net positive charge while the electrode acquires a net negative charge.

7. Electrode - Wikipedia

   en.wikipedia.org/wiki/Electrode

   In a vacuum tube or a semiconductor having polarity (diodes, electrolytic capacitors) the anode is the positive (+) electrode and the cathode the negative (−). The electrons enter the device through the cathode and exit the device through the anode. Many devices have other electrodes to control operation, e.g., base, gate, control grid.