Corrosion of springs can be divided into chemical corrosion and electrochemical corrosion according to the type of reaction.
They are all the result of the change of metal atoms on the surface of the spring or the gain and loss of electrons into an ion state. If the metal on the surface of the spring only chemically reacts with the surrounding medium, and the spring causes corrosion, it is called chemical corrosion. For example, the spring is oxidized in a particularly dry atmosphere to form an oxide film, and the spring chemically changes with the liquid or impurities in the liquid in a non-electrolyte liquid, which belongs to chemical corrosion.
If the spring is in contact with the electrolyte solution, the corrosion caused by the action of the microbattery is called electrochemical corrosion. For example, the spring is in contact with an acidic or salt solution. These solutions are electrolytes. Due to defects or impurities on the surface of the spring, electrodes with different potential differences are formed, so that the spring is constantly subjected to electrolytic corrosion.
For another example, the spring is in a humid atmosphere, because the water vapor in the atmosphere condenses into a water film or water beads on the surface of the spring, plus corrosive gases in the atmosphere (such as sulfur dioxide and hydrogen sulfide in industrial exhaust gas or in the marine atmosphere) Salt spray, etc.) dissolved in water film or water droplets to form an electrolyte. In addition, impurities or defects of the spring metal can form electrodes with different potential differences, and the spring also produces electrolytic corrosion. These are all electrochemical corrosion. The chemical corrosion of the spring is small and slow, while the electrochemical corrosion is the main and common. But generally speaking, chemical corrosion and electrochemical corrosion exist at the same time.
Springs are often subject to corrosion by surrounding media during manufacturing, storage, and use. Because the spring works by the elastic force when it works, the elastic force will change and lose its function after the spring is corroded. Therefore, preventing the corrosion of the spring can ensure the stable operation of the spring and prolong its service life.
The anti-corrosion method of spring generally adopts protective layer. According to the nature of protective layer, it can be divided into: metal protective layer, chemical protective layer, non-metallic protective layer and temporary protective layer. Stainless steel springs and copper wire springs have a certain anti-corrosion capacity, so they are generally not anti-corrosive.
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