Why does stainless steel resist rust?
Quick Answer
Stainless steel resists rust because it contains chromium, which forms a thin protective oxide layer. That layer blocks oxygen and water from reaching the iron inside.
The Full Story
Stainless steel is not rust-proof, but it is much more corrosion-resistant than ordinary steel because it contains at least about 10.5% chromium. The chromium reacts with oxygen to form a microscopic passive film of chromium oxide that protects the surface. If the film is scratched, it can often reform on its own as long as oxygen is present. This invention transformed kitchenware, medical tools and construction, and the modern stainless-steel alloy was developed in the early 20th century.
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