Why corrosion always happen layer by layer
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Answer:
because of diffusion process..
Explanation:
because oxygen gas and a water reacts with a metals to form a new chemical on a surface of the metal called oxides...
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Corrosion is the process in which metals are eaten up gradually by the action of air, moisture or a chemical on their surface. So, when the reaction occurs on the surface of the metals, the topmost layer becomes exposed to corrosion and finally wears off. Then the next layer becomes prone to corrosion. It gradually weakens the metal. Thus, corrosion occurs layer by layer
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