What does torx oval head screw passivation mean?

Much stainless steel torx oval head screw will be passivated, so what is the screw passivation process?

Passivation is an active metal or alloy in which the chemical activity is greatly reduced and becomes a noble metal state, called passivation. If the corrosion product of the metal due to the action of the medium has a dense structure, a film is formed, which is often invisible and closely covers the surface of the metal, which changes the surface state of the metal and makes the electrode potential of the metal. It changes greatly in the positive direction and becomes a passive state of corrosion resistance. This film is called a passivation film.

The torx oval head screw passivation treatment we usually say is a method of converting the metal surface into a state that is not easily oxidized and retarding the corrosion rate of the metal.

Torx oval head screw passivation can also be a spontaneous process, such as the formation of a hard-to-dissolve compound on the surface of a metal, an oxide film. In the industry, a passivating agent, mainly an oxidizing agent, is used to passivate the metal to form a protective film.

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