Contact with acidic or saline solutions, which are electrolytes. Due to defects or impurities on the surface of the spring, electrodes with different potential differences are formed, resulting in continuous electrolytic corrosion of the spring. Another example is the spring in the humid atmosphere, because the atmospheric water vapor on the surface of the spring condensed water film or water droplets, plus corrosive gases in the atmosphere (such as industrial waste gas in sulfur dioxide and hydrogen sulfide or ocean air salt fog, etc.) dissolved in the water film or droplets in the formation of electrolyte.

In addition, the impurities or defects of the spring metal can also form electrodes with different potential differences. In the process of manufacturing, storage and use, they will often suffer from the corrosion of the surrounding media. Because the spring depends on the spring force when working, the spring force will change and lose its function after being corroded. So to prevent the corrosion of the spring can ensure the stability of the work of the spring, and extend its service life.