Corrosion and Rust

What is the major flaw of steel?

• It is expensive

• It is weak

• It is difficult to work with

• It rusts

Why do metals corrode?

• They are chemically unstable

• They are exposed to oxygen

• They contain salts or acids

• They are in contact with water and oxygen

Tags

NGSS.HS-ESS2-5

What is the natural state of metals?

• Oxides

• Pure form

• Alloys

• Minerals

What is the main cause of corrosion in metals?

• Oxygen

• Water

• Salts

• Acids

Tags

NGSS.HS-ESS2-5

Why do metals corrode more quickly on the coast?

• Higher oxygen levels

• Higher salt content in the air

• Higher humidity

• Higher acid levels

Tags

NGSS.HS-PS1-5

How can corrosion be slowed down?

• Storing metals in a dry atmosphere

• Applying a protective coating

• Reducing oxygen levels

• Increasing salt content

Tags

NGSS.HS-ESS3-4

NGSS.HS-ETS1-3

What happens to the metal when it rusts?

• It becomes stronger

• It becomes softer

• It becomes brittle

• It becomes more ductile

What is the main difference between rust and other oxides?

• Rust forms a protective barrier

• Rust is impermeable

• Rust is stronger than other oxides

• Rust is not a natural state of metals

What is the purpose of barrier coatings on metals?

• To enhance the appearance

• To prevent corrosion

• To increase the strength

• To reduce the cost

Which metal is commonly used for galvanizing?

• Zinc

• Chromium

• Aluminum

• Copper