Question

An old iron beam was coated with an unknown metal. there is a crack on the coating and it is observed that the iron is rusting at the fracture. the beam is in a structure that experiences high stress, resulting in frequent fractures to the coating. what was the old metal coating likely made of and what metal you would use to repair the fractures to avoid further corrosion?

Answer 1

Based on the given description above about the metal that is being used for fractures, the old metal coating that was used before was made of TIN, and now, the metal that is used to repair fractures in order to avoid further corrosion is ALUMINUM. Hope this answer helps.

Answer 2

A good metal that can be used to prevent the corrosion of iron is  aluminum.

We have to note that one of the methods of preventing corrosion is to coat a metal with a metal that is higher than it in the electrochemical series. In that way the metal is protected from corrosion.

Hence, iron is protected from corrosion  by coating it with metals above it in the electrochemical series. A good metal that can be used to prevent the corrosion of iron is  aluminum.

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