why iron oxide do not act as a protective layer like magnesium oxide?
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Answer:
Because, When the protective oxide film is removed, engineering alloys are highly reactive in aqueous environments, not unlike sodium in water (whose oxide/hydroxide, NaOH, is highly soluble and therefore non-protective.
Similar to above reaction, iron oxide gets rust or brown coating on exposure to moisture air, so it itself is not safe
, therefore it is not used for protective layers.
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Explanation:
iron oxide donot react as a protecting layer because when iron and oxygen make bond then the process of rusting happens which destroy not protects.
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