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When steel is heated to red Hot condition, there is layer of Black coating formed. This coating is taped away and then heated. Why and how is this black coating formed.

When steel is heated to red Hot condition, there is layer of Black coating formed.  This coating is taped away and then heated.  Why and how is this black coating formed.

Grade:12th pass

1 Answers

Vikas TU
14149 Points
4 years ago
Black oxide or darkening is a transformation covering for ferrous materials, stainless steel, copper and copper based compounds, zinc, powdered metals, and silver weld. It is utilized to include mellow consumption resistance, for appearance and to limit light reflection. To accomplish maximal erosion resistance the dark oxide must be impregnated with oil or wax. One of its points of interest over different coatings is its negligible development.

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