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Stainless steel mesh under what circumstances will rust?

Stainless steel mesh is formed on its surface by the thin layer of fine stable and robust chromium-rich oxide film (protective film), to prevent the continued penetration of oxygen atoms, to oxidation, corrosion resistance capacity is obtained. Once there is some reason, this film was continuously destroyed, air, or oxygen atoms in the liquid will continue to penetrate the iron atom or a metal segregations continuously, the formation of loose iron oxide, the metal surface will be continuously corrosion. The table Mask damaged many forms, more common in everyday life the following categories:
A stainless steel surface accumulating the dust containing other metals or heterogeneous metal particles attachments, in the humid air, fixtures and stainless steel condensate between the two together into a micro-cell, causing the electrochemical reaction , the protective film is damaged, call it that electrochemical corrosion.
2 stainless steel surface adhesion of organic juice (such as vegetables, soup, sputum, etc.), in a case of water oxygen to form organic acids, acids long is the corrosion of the metal surface.
3 stainless steel surface adhesion containing acid, alkali, salts (such as wall decoration alkaline, lime splash), causing localized corrosion.
4 in the contamination of the air (such as rich in sulfides, carbon dioxide, nitrogen oxide atmosphere), the case of condensation water to form sulfuric acid, nitric acid, acetic acid solution point, cause chemical corrosion.
These conditions can cause damage to the stainless steel surface protective film to cause corrosion. Therefore, in order to ensure permanent shiny metal surface, is not corrosion, we must apply on the surface to make cleaning and passivation treatment.