Are stainless steel kitchenware really rusty?
Provide you with free commercial stainless steel kitchenware, commercial stainless steel kitchenware, canteen commercial stainless steel kitchenware and other related information release and information display, so stay tuned! Real stainless steel products should be able to be used for hundreds of years without rusting. But we can see corrosion of stainless steel or rust in the market, but generally speaking, the rate of corrosion is very slow. In this experiment, two pieces of stainless steel and ordinary carbon steel weighing 20 grams were placed in dilute nitric acid and boiled for one day and one night. As a result, ordinary steel corroded severely, leaving only 13.6 grams of weight, while the weight of stainless steel was 19.8 grams. It is precisely because stainless steel is not easy to rust, so many corrosion-resistant equipment in chemical plants are made of stainless steel. Stainless steel is easy to rust, and the chromium content is the key. China stipulates that the low content of chromium in stainless steel shall not be less than 12%. Stainless steel parts contain a high proportion of chromium, so under normal circumstances (neutral and alkaline) their surface is always in a passivated state, that is to say, it is protected by a tightly structured protective film, and it will not rust. If the chromium content is low, that is, the quality of the stainless steel is inferior, and the surface cannot produce a dense enough passivation film to protect it, which will still rust the stainless steel. Another situation is that stainless steel has highly active substances (such as salt of life, etc.), containing high chlorine or fluoride ions. Stainless steel will rust, not only the dissolved heavy metal ions are harmful to the human body.
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