Problem 1:
a) Zinc is often used as a coating on steel reinforcement. Explain two ways in which the zinc coating can protect the reinforcement. What would happen if the coating was nicked.
b) Compare the effectiveness of the zinc coating with a typical epoxy coating on reinforcement. How does the epoxy coating protect reinforcement and what happens if the coating is nicked.
Problem 2:
Rank the following materials based on their ability to act as a sacrificial anode on iron. Should any of the materials not be used?
Potassium
Aluminum
Zinc
Lead
Platinum