Corrosion of Metals

The video discusses the corrosion of different metals when exposed to the environment over time. It explains why gold remains in the best condition, while iron corrodes the most due to its reactivity. The concept of corrosion is defined, highlighting the formation of oxides. The video further explores why aluminum, despite being reactive, forms a protective oxide layer that prevents further corrosion. It introduces galvanizing as a method to protect iron by coating it with zinc, which forms a protective layer. Other methods like painting or using less reactive metals are also mentioned.

Which metal is expected to be in the best condition after years of exposure to the elements?

• Copper

• Iron

• Gold

• Aluminum

What is the term used specifically for the corrosion of iron?

• Tarnishing

• Erosion

• Oxidation

• Rusting

Why does aluminum not corrode as much as iron despite being more reactive?

• It is coated with another metal

• It is less exposed to air

• It is not reactive with water

• It forms a protective oxide layer

What is the process called when iron is coated with zinc to prevent corrosion?

• Galvanizing

• Painting

• Electroplating

• Anodizing

Which of the following is NOT a method to prevent corrosion on a bike?

• Exposing to salt water

• Covering with a thin layer of gold

• Greasing the chain

• Painting the frame