What is the principle of stainless steel not rusting
Stainless steel refers to steel that is resistant to weak corrosive media such as air, steam, and water, and chemically corrosive media such as acids, alkalis, and salts. It is made of iron-chromium alloy mixed with other trace elements. Because of its good metal properties and corrosion resistance than other metals, the made utensils are beautiful and durable. Whether stainless steel is easy to rust, the content of chromium is the key. my country stipulates that the minimum chromium content in stainless steel should not be less than 12%. The stainless steel component contains a high proportion of chromium, so under normal circumstances (neutral and alkaline) its surface is always in a passivated state, that is to say, it is protected by a tightly structured protective film, so it will not rust. If the chromium content is low, that is, inferior stainless steel, its surface cannot form a sufficiently tight passivation film to protect it. This kind of stainless steel will still rust. Another situation is that stainless steel encounters highly reactive substances (such as salt in daily life) and contains high chlorine or fluoride ions. Even high-quality stainless steel with high chromium content will destroy the passivation film on its surface. , So that the surface of the stainless steel is in an active state. At this time, the stainless steel will not only rust, but also dissolve heavy metal ions that are harmful to the body.
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