Assessment

What is corrosion?

• A process that converts metal into plastic

• The formation of a metal alloy

• The gradual destruction of metal due to chemical reactions

• The process of metal melting at high temperatures

Which of the following metals is not prone to corrosion?

• Steel

• Zinc
  

• Aluminum

• Titanium

What is the term for the process of removing rust from metal surfaces?

• Oxidation

• Passivation

• Galvanization

• Reduction

True or False: Coating a metal surface can prevent corrosion completely.

Answer explanation

False. While putting a protective layer on a metal surface can help stop corrosion, it doesn't guarantee that it won't happen at all. If the protective layer gets damaged or worn out, corrosion can still happen in the exposed areas.

True or False: Corrosion is always visible on the surface of a metal.

• True. Corrosion can occur when metals are exposed to various environmental factors, including water.

• True. Corrosion is usually seen on the outside of a metal. It can make the metal change color, create holes, or form rust or other signs of corrosion..

• False. Corrosion can occur beneath the surface of a metal, leading to hidden or hidden corrosion.

• Both. because it can occur on both sides.

How does the presence of saltwater affect the rate of corrosion?

• It slows down corrosion.

• It speeds up corrosion.

• It prevents corrosion completely.

• It has no effect on corrosion.

Answer explanation

The presence of saltwater can significantly increase the rate of corrosion. This is because saltwater contains dissolved salts, primarily sodium chloride (NaCl), which acts as an electrolyte.

How can we protect metal objects from corrosion?

• Keeping them dry

• Using sacrificial anodes (Metals)

• Applying a protective coating

• All of the above

Which metal is commonly used to make cans for storing food to prevent corrosion?

• Aluminum

• Copper

• Iron

• Gold

Why is the corrosion of iron and other metals a problem?

• a) It makes the metal surface look dull and unattractive.
  

• It weakens the metal structure, leading to potential failures.

• It reduces the electrical conductivity of the metal.

• All of the above.

How does corrosion impact the lifespan of metal structures?

• It has no effect on the lifespan.

• It significantly extends the lifespan.

• It reduces the lifespan.
  

• It depends on the protective measures taken.