If the spring is in contact with an electrolyte solution, the corrosion caused by the action of the microbattery is called electrochemical corrosion. For example, if the spring is in contact with an acidic or salt solution, these solutions are all electrolytes. Due to defects or impurities on the surface of the spring, electrodes with different potential differences are formed, causing the spring to be constantly corroded by electrolysis. Another example is that the spring is in a humid atmosphere. Because the water vapor in the atmosphere condenses into a water film or water droplets on the surface of the spring, and the corrosive gas in the atmosphere dissolves in the water film or water droplets to form an electrolyte. In addition, impurities or defects in the spring metal can also form electrodes with different potential differences, and the spring also undergoes electrolytic corrosion. These are all electrochemical corrosion.