What makes a steel stainless?

The addition of Chromium and Nickel to the iron creates a significant percentage of Chromium and Nickel items at the surface.These atoms form tenacious oxides that mask the surface and prevent oxidation of the iron. The process known as passivation for stainless steel, is a common means of improving this protective oxide layer through the use of oxidizing acids.The corrosion resistance of stainless steel depends on the Chromium. 

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