The process of galvanising is used for corrosion prevention. An alloy that is more than the substrate is chosen as the coating. Any break in the coating will protect the substrate by supplying electrons to the exposed substrate, preventing the reaction.

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Photochemistry

Photochemistry is the part of chemistry that studies the various mechanisms of reactions that are triggered by the presence of light energy. It also helps to study the changes involved in a molecule that can undergo the absorption of radiation.