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Corrosion and Protection

Description: Corrosion and Protection Quiz
Number of Questions: 15
Created by:
Tags: corrosion protection materials science
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What is the primary cause of corrosion?

  1. Oxidation

  2. Reduction

  3. Electrolysis

  4. Mechanical damage

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Correct Option: A
Explanation:

Corrosion is primarily caused by the oxidation of metals, which occurs when they react with oxygen in the presence of moisture.

Which of the following metals is most resistant to corrosion?

  1. Iron

  2. Steel

  3. Copper

  4. Aluminum

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Correct Option: D
Explanation:

Aluminum is most resistant to corrosion due to the formation of a protective oxide layer on its surface.

What is the most common type of corrosion?

  1. Uniform corrosion

  2. Pitting corrosion

  3. Crevice corrosion

  4. Galvanic corrosion

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Correct Option: A
Explanation:

Uniform corrosion is the most common type of corrosion, where the metal surface corrodes evenly.

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

  1. Painting

  2. Galvanization

  3. Cathodic protection

  4. All of the above

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Correct Option: D
Explanation:

Painting, galvanization, and cathodic protection are all common methods of protecting metals from corrosion.

What is the principle behind cathodic protection?

  1. Applying a sacrificial anode to the metal surface

  2. Applying a protective coating to the metal surface

  3. Increasing the pH of the surrounding environment

  4. Decreasing the temperature of the surrounding environment

Show answer
Correct Option: A
Explanation:

Cathodic protection involves applying a sacrificial anode to the metal surface, which corrodes instead of the metal.

Which of the following is a common sacrificial anode material?

  1. Zinc

  2. Magnesium

  3. Aluminum

  4. Copper

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Correct Option: A
Explanation:

Zinc is a common sacrificial anode material due to its high electrochemical potential.

What is the primary mechanism of pitting corrosion?

  1. Localized breakdown of the protective oxide layer

  2. Uniform attack of the metal surface

  3. Crevice formation between two metal surfaces

  4. Galvanic interaction between two dissimilar metals

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Correct Option: A
Explanation:

Pitting corrosion is caused by the localized breakdown of the protective oxide layer on the metal surface.

Which of the following factors can contribute to pitting corrosion?

  1. High chloride concentration

  2. Low pH

  3. Presence of crevices

  4. All of the above

Show answer
Correct Option: D
Explanation:

High chloride concentration, low pH, and the presence of crevices can all contribute to pitting corrosion.

What is crevice corrosion?

  1. Corrosion that occurs in the narrow gap between two metal surfaces

  2. Corrosion that occurs on the surface of a metal exposed to a corrosive environment

  3. Corrosion that occurs due to the galvanic interaction between two dissimilar metals

  4. Corrosion that occurs due to the breakdown of the protective oxide layer

Show answer
Correct Option: A
Explanation:

Crevice corrosion occurs in the narrow gap between two metal surfaces, where oxygen and moisture can become trapped and cause localized corrosion.

Which of the following is a common method of preventing crevice corrosion?

  1. Using sealants or gaskets to fill the gaps between metal surfaces

  2. Increasing the pH of the surrounding environment

  3. Applying a protective coating to the metal surfaces

  4. All of the above

Show answer
Correct Option: D
Explanation:

Using sealants or gaskets, increasing the pH, and applying protective coatings can all help prevent crevice corrosion.

What is galvanic corrosion?

  1. Corrosion that occurs when two dissimilar metals are in electrical contact

  2. Corrosion that occurs due to the breakdown of the protective oxide layer

  3. Corrosion that occurs in the narrow gap between two metal surfaces

  4. Corrosion that occurs on the surface of a metal exposed to a corrosive environment

Show answer
Correct Option: A
Explanation:

Galvanic corrosion occurs when two dissimilar metals are in electrical contact, causing one metal to corrode more rapidly than the other.

Which of the following factors can affect the rate of galvanic corrosion?

  1. The difference in electrochemical potential between the two metals

  2. The surface area of the two metals in contact

  3. The conductivity of the electrolyte

  4. All of the above

Show answer
Correct Option: D
Explanation:

The difference in electrochemical potential, the surface area of the metals in contact, and the conductivity of the electrolyte can all affect the rate of galvanic corrosion.

What is the primary method of preventing galvanic corrosion?

  1. Using dissimilar metals with similar electrochemical potentials

  2. Isolating the two metals from each other

  3. Applying a protective coating to the metals

  4. All of the above

Show answer
Correct Option: D
Explanation:

Using dissimilar metals with similar electrochemical potentials, isolating the metals from each other, and applying protective coatings can all help prevent galvanic corrosion.

What is the purpose of corrosion inhibitors?

  1. To slow down the rate of corrosion

  2. To prevent corrosion from occurring

  3. To remove corrosion products from metal surfaces

  4. To improve the appearance of metal surfaces

Show answer
Correct Option: A
Explanation:

Corrosion inhibitors are chemicals that are added to corrosive environments to slow down the rate of corrosion.

Which of the following is a common type of corrosion inhibitor?

  1. Anodic inhibitors

  2. Cathodic inhibitors

  3. Mixed inhibitors

  4. All of the above

Show answer
Correct Option: D
Explanation:

Anodic inhibitors, cathodic inhibitors, and mixed inhibitors are all common types of corrosion inhibitors.

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