How are stainless steel extension springs generally anti-corrosive?

How are stainless steel extension springs generally anti-corrosive?



​Stainless steel extension springs are one of the spring varieties. Generally, stainless steel extension springs are manufactured according to the principle of tension application. It is a coil spring that can accept axial tension. Stainless steel extension springs generally need to be made of round cross-section materials. When the load is not accepted, the rings of stainless steel extension springs are generally tight and there is no gap between them.

Springs are generally made by winding spring wire, because they are simple to manufacture, low in price, easy to detect and install, so they are widely used. They are generally of equal pitch and mostly circular in cross section. They can be used in many occasions, such as production installation, experiment, repair, etc. This spring is commonly used in medical breathing equipment, motion control, medical mobile equipment, crafts, home care equipment, shock absorption, pump springs, mechanical and electronic protective hardware, fluid control valves, actuators, switch equipment, etc. one.

Since stainless steel extension springs are all made of metal, it is generally necessary to pay attention to damage and avoid fatigue during use. For example, during the use of automotive stainless steel extension springs, they must suffer from the corrosion of harmful gases and work under corrosion fatigue conditions. Local corrosion damage on the surface of the steel wire constitutes a stress concentration, which will gradually expand the corrosion fatigue cracks. Oxidation treatment can generally make the shell hook spring have anti-corrosion properties.
  
The hook spring can form a dense oxide film on the surface of the steel wire after the relevant oxidation treatment, so as to avoid the corrosive effect of the gunpowder gas. Oxidation treatment can reduce the friction effect of the hook spring. During shooting, the hook spring repeatedly spreads and compresses in the spring chamber, and at the same time it forms friction with the spring chamber and generates frictional heat. This is also one of the reasons for the early failure of the shell hook spring.

Therefore, after the hook spring is oxidized, the small pores of the oxide film can generally store oil, so it has a lubricating effect on the stainless steel extension springs; the thermal conductivity of the oxide film is much lower than that of the hook spring steel wire. The good thermal protection effect is also helpful to avoid the early failure of the hook spring.