T Level Corrosion Quiz

Corrosion is an example of:

• Oxidation

• Reduction

• Electrolysis

• Erosion

Which of the following factors does not govern the rusting of iron?

• Presence of air

• Presence of moisture

• Presence of electrolytes in water

• Presence of impurities of more electropositive metals in iron

In galvanic corrosion:

• More metal gets corroded

• Less noble metal gets corroded

• The metal having a higher standard reduction potential gets corroded

• The metal placed lower in the electrochemical series get corroded

The localised formation of holes in the surface of a metal is called:

• Waterline corrosion

• Pitting corrosion

• Concentration cell corrosion

• Wet corrosion

What is the cause of crevice corrosion?

• A difference in the ion concentration of the surrounding air

• A difference in the ion concentration between two areas of metal

• A reduction in the ion concentration in one metal in relation to another

• An increase in the gap between two metals in close proximity to one another

Which of the following is not a method of corrosion prevention?

• Metal alloy

• Temperature control

• Chemical inhibitor

• Protective coating

Which of the following metals is most likely to undergo galvanic corrosion when paired with copper?

• Gold

• Aluminum

• Silver

• Platinum

Answer explanation

Current (ions) will flow from negative to positive taking small amounts of material with it.

NOTE: the precious metals are positive (most Noble) and therefore don't corrode!

What is the primary chemical process involved in the rusting of iron?

• Neutralization

• Hydrolysis

• Reduction

• Oxidation

Which of the following is a common method to protect metals from corrosion?

• Galvanization

• All of the above

• Electroplating

• Painting

• Powder Coating

Which of the following metals is least likely to corrode in a marine environment?

• Iron

• Aluminum

• Copper

• Stainless Steel