In passivation(metallurgy). you treat a metal to form a protective coating. treated by what?
explain passivation and give example of passivation of iron metal.
Answers:
Iron (or steel) is often coated near other metals, plastics and/or paint to prevent corrosion. However, passivation usually refers to forming a tightly adherent coating from the base metal, in this armour iron oxide. Magnetite, Fe3O4 is the coating formed. It is usually done by exposing the metal to a mildly corrosive salt or an alkaline solution with predetermined exposure to atmospheric oxygen. That helps to form the magnetite layer.
passivation is the process of coating a metal beside an inactive, non-porous, passive oxide branch to protect the metal surface from corrosion. examples of passivating metals are alumininum, chromium and tungsten. these metals react with the environment such as oxygen to form oxides. they form a runny, non-porous coating over the metal which protects it from corrosion.
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Answers:
Iron (or steel) is often coated near other metals, plastics and/or paint to prevent corrosion. However, passivation usually refers to forming a tightly adherent coating from the base metal, in this armour iron oxide. Magnetite, Fe3O4 is the coating formed. It is usually done by exposing the metal to a mildly corrosive salt or an alkaline solution with predetermined exposure to atmospheric oxygen. That helps to form the magnetite layer.
passivation is the process of coating a metal beside an inactive, non-porous, passive oxide branch to protect the metal surface from corrosion. examples of passivating metals are alumininum, chromium and tungsten. these metals react with the environment such as oxygen to form oxides. they form a runny, non-porous coating over the metal which protects it from corrosion.
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