Which type of corrosion cell causes iron or steel to corrode (and create rust) when a...

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Mechanical Engineering

Which type of corrosion cell causes iron or steel to corrode(and create rust) when a droplet of water is in contact with thesurface? Question 10 options: a) Composition (dissimilar metals)cell b) Stress cell c) Concentration cell

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The type of corrosion cell that causes iron or steel to corrode (and create rust) when a droplet of water is in contact with the surface is Concentration cell.

The corrosion of iron or steel is an electrochemical process. When droplet of water comes in contact with the surface , the surface tends to become voltaic cell and starts to oxidise. Concentration cell involving oxygen can initiate pitting through generation of cathodic and anodic areas. Differential aeration (oxygen concentration cell) and ion concentration (salt concentration) cells create dissimilar polarities (anodic and cathodic areas). The above question is an example for this .

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