The passivation film on the surface of 304 stainless steel sheet is a protective oxide layer used to prevent stainless steel from corroding in the environment. The passivation film can be damaged by the following factors:
Mechanical wear: External objects or friction can cause surface wear of the passivation film and reduce its protective effect.
Chemical substances: Contact with corrosive chemicals such as strong acids and alkalis will destroy the passivation film.
High temperature: Long-term exposure to high temperature environment will damage the passivation film and affect its protective effect.
Salt spray: Salt spray in a marine environment or an atmosphere containing salt will accelerate the destruction of the passivation film and cause corrosion.
Electrochemical reaction: The metal surface exists in areas with different potentials, and electrochemical reactions may occur, resulting in damage to the passivation film.
Defects: Defects or uneven thickness of the passivation film itself can also make it vulnerable to damage.
