Analysis of the corrosion resistance of springs

Spring corrosion can be divided into chemical corrosion and electrochemical corrosion according to the type of reaction.

Material and Surface Treatment of Valve Spring

They are the result of changes in the metal atoms on the surface of the spring or electron gain or loss into the ionic state. If the spring surface metal only purely with the surrounding media chemical reaction, and spring corrosion caused by chemical corrosion. For example, the spring oxidation in a particularly dry atmosphere to generate oxide film, and the spring in a non-electrolyte liquid with the liquid or the impurities in the liquid chemical changes, etc., belong to chemical corrosion.

 

If the spring is in contact with an electrolyte solution, the corrosion due to the action of the microcell is called electrochemical corrosion. For example, the spring contact with acidic or salt solutions, such solutions are electrolytes, due to defects on the surface of the spring or impurities, etc., so that the formation of electrodes with different potential differences so that the spring is constantly subject to electrolytic corrosion.

 

Another example is the spring in the humid atmosphere, because the water vapor in the atmosphere condensed into a water film or water beads on the surface of the spring, plus the corrosive gases in the atmosphere (such as industrial exhaust gas sulfur dioxide and hydrogen sulfide or salt spray in the marine atmosphere, etc.) dissolved in the water film or water beads to form electrolytes. In addition to the spring metal impurities or defects that can also form a potential difference between the electrodes, the spring also produces electrolytic corrosion. These are electrochemical corrosion. Spring by chemical corrosion is a small amount, slowly, and electrochemical corrosion is the main, universal. But generally speaking, chemical corrosion and electrochemical corrosion are at the same time.

 

Spring in the manufacture, storage, use and other processes, often suffer from corrosion of the surrounding media. As the spring is working on the elasticity of the role, the spring is corroded after the elasticity will change and lose its function. Therefore, the prevention of spring corrosion can ensure the stability of the spring’s work and extend its service life.

 

Spring corrosion prevention methods generally use a protective layer, according to the nature of the protective layer can be divided into a metal protective layer, chemical protective layer, non-metal protective layer, and temporary protective layer. Stainless steel springs and copper wire springs have a certain degree of corrosion resistance in themselves, so they are generally not anticorrosive treatment.

Hootai Spring will select the raw materials and treat the surface of the spring according to the specific conditions of the spring, the environment of use, and the needs of the customer.

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