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Marine Corrosion and Protection

Description: This quiz covers the fundamental concepts of marine corrosion and the various methods employed to protect marine structures from corrosion.
Number of Questions: 15
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Tags: marine corrosion corrosion protection marine engineering
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Which of the following factors is NOT a major contributor to marine corrosion?

  1. High salinity levels in seawater

  2. Presence of dissolved oxygen in seawater

  3. High temperatures in marine environments

  4. Biofouling on marine structures


Correct Option: C
Explanation:

High temperatures are generally not a major contributor to marine corrosion. The primary factors influencing marine corrosion are the presence of dissolved oxygen, salinity levels, and biofouling.

What is the primary mechanism responsible for the corrosion of metals in seawater?

  1. Galvanic corrosion

  2. Pitting corrosion

  3. Crevice corrosion

  4. Stress corrosion cracking


Correct Option: A
Explanation:

Galvanic corrosion is the primary mechanism responsible for the corrosion of metals in seawater. It occurs when two dissimilar metals are in electrical contact in the presence of an electrolyte, such as seawater.

Which of the following metals is most resistant to marine corrosion?

  1. Carbon steel

  2. Stainless steel

  3. Aluminum

  4. Copper


Correct Option: B
Explanation:

Stainless steel is more resistant to marine corrosion compared to carbon steel, aluminum, and copper due to the presence of chromium in its alloy composition.

What is the purpose of cathodic protection in marine corrosion control?

  1. To remove corrosion products from metal surfaces

  2. To apply a protective coating on metal surfaces

  3. To create a sacrificial anode that corrodes instead of the protected metal

  4. To increase the thickness of the metal structure


Correct Option: C
Explanation:

Cathodic protection involves connecting a sacrificial anode to the metal structure to be protected. The anode corrodes preferentially, thereby protecting the structure from corrosion.

Which of the following is NOT a common type of coating used for marine corrosion protection?

  1. Epoxy coatings

  2. Polyurethane coatings

  3. Zinc coatings

  4. Ceramic coatings


Correct Option: D
Explanation:

Ceramic coatings are not commonly used for marine corrosion protection due to their high cost and limited flexibility.

What is the primary function of impressed current cathodic protection systems?

  1. To generate an electric current that flows from the anode to the protected structure

  2. To create a sacrificial anode that corrodes instead of the protected structure

  3. To apply a protective coating on the metal surface

  4. To remove corrosion products from metal surfaces


Correct Option: A
Explanation:

Impressed current cathodic protection systems generate an electric current that flows from the anode to the protected structure, thereby protecting it from corrosion.

Which of the following is NOT a common method for preventing biofouling on marine structures?

  1. Applying antifouling coatings

  2. Regular cleaning and maintenance

  3. Using copper-based alloys

  4. Increasing the water flow around the structure


Correct Option: D
Explanation:

Increasing the water flow around the structure is not a common method for preventing biofouling. Antifouling coatings, regular cleaning, and the use of copper-based alloys are more effective methods.

What is the role of sacrificial anodes in galvanic cathodic protection systems?

  1. To generate an electric current that flows from the anode to the protected structure

  2. To create a barrier between the protected structure and the corrosive environment

  3. To corrode preferentially, thereby protecting the structure from corrosion

  4. To remove corrosion products from metal surfaces


Correct Option: C
Explanation:

Sacrificial anodes in galvanic cathodic protection systems corrode preferentially, releasing electrons that flow to the protected structure and prevent its corrosion.

Which of the following is NOT a common material used for sacrificial anodes in marine cathodic protection systems?

  1. Zinc

  2. Aluminum

  3. Magnesium

  4. Copper


Correct Option: D
Explanation:

Copper is not commonly used as a sacrificial anode in marine cathodic protection systems due to its relatively high cost and lower reactivity compared to other materials like zinc, aluminum, and magnesium.

What is the primary purpose of using inhibitors in marine corrosion control?

  1. To remove corrosion products from metal surfaces

  2. To create a barrier between the metal surface and the corrosive environment

  3. To increase the thickness of the metal structure

  4. To generate an electric current that flows from the anode to the protected structure


Correct Option: B
Explanation:

Inhibitors are used in marine corrosion control to create a barrier between the metal surface and the corrosive environment, thereby reducing the rate of corrosion.

Which of the following is NOT a common type of inhibitor used in marine corrosion control?

  1. Organic inhibitors

  2. Inorganic inhibitors

  3. Metallic inhibitors

  4. Biocidal inhibitors


Correct Option: D
Explanation:

Biocidal inhibitors are not commonly used in marine corrosion control. Organic inhibitors, inorganic inhibitors, and metallic inhibitors are more commonly employed.

What is the primary function of impressed current cathodic protection systems?

  1. To generate an electric current that flows from the anode to the protected structure

  2. To create a sacrificial anode that corrodes instead of the protected structure

  3. To apply a protective coating on the metal surface

  4. To remove corrosion products from metal surfaces


Correct Option: A
Explanation:

Impressed current cathodic protection systems generate an electric current that flows from the anode to the protected structure, thereby protecting it from corrosion.

Which of the following is NOT a common material used for anodes in impressed current cathodic protection systems?

  1. Platinum

  2. Graphite

  3. Zinc

  4. Steel


Correct Option: D
Explanation:

Steel is not commonly used as an anode material in impressed current cathodic protection systems due to its relatively low corrosion resistance.

What is the primary purpose of using biocides in marine corrosion control?

  1. To remove corrosion products from metal surfaces

  2. To create a barrier between the metal surface and the corrosive environment

  3. To kill or inhibit the growth of microorganisms on metal surfaces

  4. To increase the thickness of the metal structure


Correct Option: C
Explanation:

Biocides are used in marine corrosion control to kill or inhibit the growth of microorganisms on metal surfaces, thereby reducing the rate of biofouling and associated corrosion.

Which of the following is NOT a common type of biocide used in marine corrosion control?

  1. Chlorine

  2. Bromine

  3. Copper

  4. Zinc


Correct Option: D
Explanation:

Zinc is not commonly used as a biocide in marine corrosion control. Chlorine, bromine, and copper are more commonly employed.

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