Stainless steel passivation treatment

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We often think that stainless steel does not rust, but the truth is that it can still rust. So how can we prevent stainless steel from rusting, or at least delay the onset of rusting? I would like to ask everyone to share their opinions. In my personal opinion, stainless steel rusts because its chemical ions come into contact with water molecules in the air, which causes its molecules to disperse; since its natural environment is disrupted, it rusts. As for how to prevent rusting, there are various methods available. The most common one is, of course, applying paint to the metal surface to create a protective layer against rust. Another method is to use anti-rust oils as a barrier to prevent rusting. However, this traditional approach to affecting the appearance is no longer suitable for our requirements regarding products, so other methods of rust prevention have been adopted. So what I would like to share with you today is a chemical rust prevention method that involves applying a passivating film to the surface of metals; this film is colorless and transparent, and it is also a edible chemical solution. So why can it exert such an effect? The principle is quite simple: by soaking the metal in a solution, the molecular ions of the metal combine with the substances in that solution, forming a protective layer on its surface. This is what I mean by a passivation layer. This rust-prevention method is not only simple and easy to implement, but it also results in an attractive appearance; moreover, it meets food safety standards, allowing customers to use it with confidence and making it more popular in the market. What do you think?