Stainless steel does not get rust. Why?

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Solution

Stainless steel or threaded steel bar is an alloy that contain metals,chromium & nickel. In Chromium, it should contain at least 10% of the steel alloy for stainless steel to be rust resistant.So, when the chromium is in contact with water, air, and acids, a thin layer of oxide forms to stop further corrosion. Aluminum becomes rust resistant after a short exposure to air creates a thin oxide layer.

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