Question

Part A

Cathodic protection of iron involves using another more reactive metal as a sacrificial anode. Classify each of the following metals by whether they would or would not act as a sacrificial anode to iron.

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Ag

Mg

Cu

Pb

Sn

Zn

Au

Will act as sacrificial anode for iron

Will not act as sacrificial anode for iron

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Part B

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?

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gold

aluminum

tin

1. The old coating was likely made of .

2. would be a good choice for repairing the fracture.

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