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Corrosion Engineering Multiple-Choice Questions (MCQs)

What is Corrosion Engineering?

Corrosion engineering is an engineering or a subject that is taught in various branches of engineering such as chemical, civil, petroleum, mechanical, metallurgical, and mining engineering. Corrosion engineering focuses on the study of natural laws and physical resources to design and implement materials, structures, devices, systems, and procedures to manage corrosion.

Corrosion Engineering Topics

Corrosion engineering covers the topics such as stress corrosion cracking, crevice corrosion, electrochemistry, galvanic corrosion, metallurgy, electroplating, general corrosion, fracture mechanics, selective leaching, electrochemical corrosion, and many more.

Corrosion Engineering MCQs with Answers

Explore and practice the top 50 multiple-choice questions with answers on corrosion engineering. These corrosion engineering MCQs are written for beginners as well as advanced that are helpful to learn, test, and enhance the knowledge of corrosion engineering.

List of Corrosion Engineering MCQs

1. Which type of corrosion takes place evenly throughout a material's whole surface?

1. Galvanic corrosion
2. Intergranular corrosion
3. Pitting corrosion
4. Uniform corrosion

Answer: D) Uniform corrosion

Explanation:

Uniform corrosion is a type of corrosion that takes place evenly throughout a material's whole surface.

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2. When two distinct metals or alloys come into touch with each other in the presence of an electrolyte, which of the following is corrosion?

1. Galvanic corrosion
2. Intergranular corrosion
3. Pitting corrosion
4. Soil corrosion

Answer: A) Galvanic corrosion

Explanation:

When two distinct metals or alloys come into touch with each other in the presence of an electrolyte, galvanic corrosion occurs.

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3. Which of the following is not true about corrosion?

1. Corrosion is only restricted to metallic materials
2. Corrosion is an electrochemical reaction
3. Material selection is essential in corrosion prevention
4. Environmental factors have a considerable influence on corrosion

Answer: A) Corrosion is only restricted to metallic materials.

Explanation:

Corrosion affects not just metallic items but also all building materials.

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4. Metal corrosion can be accelerated by the presence of oxygen in the atmosphere?

1. True
2. False

Answer: A) True

Explanation:

Metal corrosion can be accelerated by the presence of oxygen in the atmosphere.

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5. Which of the following corrosion can occur in the absence of oxygen?

1. Galvanic corrosion
2. Intergranular corrosion
3. Pitting corrosion
4. Uniform corrosion

Answer: B) Intergranular corrosion

Explanation:

In the absence of oxygen, intergranular corrosion can develop.

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6. In most situations, ____ metals corrode easily due to their low corrosion resistance.

1. Active metals
2. Passive metals
3. Nobel metals

Answer: A) Active metals

Explanation:

In most situations, active metals corrode easily due to their low corrosion resistance.

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7. Which of the following metals can create a protective oxide layer on their surface, acting as a barrier against further corrosion?

1. Active metals
2. Passive metals
3. Nobel metals

Answer: B) Passive metals

Explanation:

Passive metals can create a protective oxide layer on their surface, acting as a barrier against further corrosion.

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8. Which of the following is not true about noble metals?

1. Nobel metals have a low electron-loss propensity
2. In the presence of most corrosive substances, Nobel metals become unstable
3. Noble metals have the greatest corrosion resistance
4. They are very inert and corrosion-resistant

Answer: B) In the presence of most corrosive substances, Nobel metals become unstable.

Explanation:

Nobel metals are resistant to the majority of corrosive chemicals.

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9. High temperatures ____ the rusting process.

1. Increasing
2. Decrease
3. No effect

Answer: A) Increasing

Explanation:

High temperatures hasten the rusting process.

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10. Smooth surfaces are more corrosion-resistant than rough surfaces?

1. True
2. False

Answer: A) True

Explanation:

True, Smooth surfaces are more corrosion-resistant than rough surfaces.

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11. Which of the following is True about anode in corrosion engineering terms?

1. The anode is the electrode or metal surface where reduction happens during corrosion
2. The anode is the metal surface or electrode where oxidation occurs during corrosion

Answer: B) The anode is the metal surface or electrode where oxidation occurs during corrosion.

Explanation:

The anode is the metal surface or electrode where oxidation occurs during corrosion.

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12. The creation of a thin, protective oxide coating on the surface of a metal that offers resistance to subsequent corrosion is known as ____.

1. Pickling
2. Electropolishing
3. Plating
4. Passivation

Answer: D) Passivation

Explanation:

The creation of a thin, protective oxide coating on the surface of a metal that offers resistance to subsequent corrosion is known as passivation.

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13. What is the abbreviation of MIC?

1. Micro-integrated corrosion
2. Micro-infected corrosion
3. Microbiologically influenced corrosion
4. Microorganism-infected corrosion

Answer: C) Microbiologically influenced corrosion

Explanation:

The full form of MIC is microbiologically influenced corrosion.

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14. Which of the following type of bonds happen as electrons travel from one atom to another, resulting in the production of positive and negative ions?

1. Metallic bond
2. Covalent bond
3. Hydrogen bond
4. Ionic bond

Answer: D) Ionic bond

Explanation:

Ionic bonds happen as electrons travel from one atom to another, resulting in the production of positive and negative ions.

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15. ____ bonds develop when two atoms share electron pairs.

1. Metallic bond
2. Covalent bond
3. Hydrogen bond
4. Van der Waals force bond

Answer: B) Covalent bond

Explanation:

Covalent bonds develop when two atoms share electron pairs.

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16. In comparison to covalent or ionic bonding, hydrogen bonds are ____.

1. Comparatively strong
2. Comparatively weak
3. Same

Answer: B) Comparatively weak

Explanation:

In comparison to covalent or ionic bonding, hydrogen bonds are comparatively weak.

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17. What kinds of bonds are present in ceramics and polymers?

1. Metallic bond
2. Covalent bond
3. Hydrogen bond
4. Van der Waals force bond

Answer: B) Covalent bond

Explanation:

Covalent bonds are present in ceramics and polymers.

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18. Which of the following has a high corrosion resistance?

1. Homogeneous Alloy
2. Heterogenous Alloy

Answer: A) Homogeneous Alloy

Explanation:

Homogeneous alloys have high corrosion resistance.

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19. A metal can undergo ____ corrosion if submerged in a corrosive liquid or environment.

1. General attack corrosion
2. Atmospheric corrosion
3. High-temperature corrosion
4. Immersion corrosion

Answer: D) Immersion corrosion

Explanation:

A metal can undergo immersion corrosion if submerged in a corrosive liquid or environment.

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20. Which of the following metal is resistant to corrosion?

1. Titanium
2. Zinc
3. Magnesium
4. Iron

Answer: A) Titanium

Explanation:

Titanium is a metal that is highly resistant to corrosion.

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21. Which of the following is True about fatigue crack?

1. A fatigue crack is a crack that forms in a material as a result of constant stress
2. A fatigue crack is a crack that forms in a material as a result of non-repetitive cyclic loading
3. A fatigue crack is a crack that forms in a material as a result of repetitive cyclic loading
4. A fatigue crack is a crack that forms in a material as a result of repetitive non-cyclic cyclic loading

Answer: C) A fatigue crack is a crack that forms in a material as a result of repetitive cyclic loading.

Explanation:

A fatigue crack is a crack that forms in a material as a result of repetitive cyclic loading.

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22. Which graph depicts the connection between an applied potential or current density and the corrosion rate that results?

1. Polarization Curve
2. Pourbaix Diagram
3. Corrosion Rate vs. Time
4. Corrosion Rate vs. Velocity

Answer: A) Polarization Curve

Explanation:

A polarisation curve is a graph that depicts the connection between an applied potential or current density and the corrosion rate that results.

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23. Which of the following conditions must exist for electrochemical corrosion to take place?

1. The presence of an electrolyte, which might be a liquid or a wet environment, is required for electrochemical corrosion
2. Corrosion is characterized by the creation of an electrochemical cell composed of an anode, a cathode, and an electrolyte
3. Both

Answer: C) Both

Explanation:

Following conditions must exist for electrochemical corrosion to take place:

• The presence of an electrolyte, which might be a liquid or a wet environment, is required for electrochemical corrosion
• Corrosion is characterized by the creation of an electrochemical cell composed of an anode, a cathode, and an electrolyte

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24. Corrosion inhibitors tend to be ____ effective at lower temperatures.

1. More
2. Less

Answer: A) More

Explanation:

Corrosion inhibitors tend to be more effective at lower temperatures.

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25. Which of the following statement is true about Corrosion caused by differential aeration?

1. Corrosion caused by differential aeration happens when the nitrogen concentration varies over the metal surface
2. Corrosion caused by differential aeration happens when the hydrogen concentration varies over the metal surface
3. Corrosion caused by differential aeration happens when the oxygen concentration varies over the metal surface

Answer: C) Corrosion caused by differential aeration happens when the oxygen concentration varies over the metal surface.

Explanation:

Corrosion caused by differential aeration happens when the oxygen concentration varies over the metal surface.

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26. Which of the following type of corrosion is an example of Corrosion caused by differential aeration?

1. Pitting corrosion
2. Galvanic corrosion
3. Uniform corrosion
4. Intergranular corrosion

Answer: A) Pitting corrosion

Explanation:

Pitting corrosion is a type of corrosion which is example of Corrosion caused by differential aeration.

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27. What is the other name for dry corrosion?

1. Uniform corrosion
2. Atmospheric corrosion
3. Crevice corrosion
4. Differential corrosion

Answer: B) Atmospheric corrosion

Explanation:

The other name for dry corrosion is Atmospheric corrosion or oxidation.

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28. Which of the following is a slow process?

1. Dry corrosion
2. Wet corrosion

Answer: A) Dry corrosion

Explanation:

Dry corrosion is a time-consuming process.

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29. Mainly how many types of corrosion inhibitors are there?

1. 5
2. 6
3. 2
4. 3

Answer: D) 3

Explanation:

Mainly there are three types of corrosion inhibitors:

• Anodic
• Cathodic
• Mixed

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30. Chromates, nitrates, and molybdates are examples of which type of inhibitors?

1. Anodic
2. Cathodic
3. Mixed

Answer: A) Anodic

Explanation:

Chromates, nitrates, and molybdates are examples of anodic inhibitors.

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31. The ____ series is a classification of metals and semimetals based on their nobility.

1. Electrochemical series
2. Galvanic series

Answer: B) Galvanic series

Explanation:

The galvanic series is a classification of metals and semimetals based on their nobility.

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32. In which series, do metals have a fixed position?

1. Electrochemical series
2. Galvanic series

Answer: A) Electrochemical series

Explanation:

Unlike the galvanic series, in the electrochemical series, the position of a metal is fixed regardless of the environment.

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33. Are thermoplastics resistant to corrosion?

1. Yes
2. No

Answer: A) Yes

Explanation:

Yes, thermoplastic is highly resistant to corrosion.

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34. What is the chemical formula of high-density polyethylene (HDPE)?

1. (CH2) n
2. (C3H6)n
3. (C2H3Cl)n
4. (CH2F2)n

Answer: A) (CH2) n

Explanation:

The chemical formula for high-density polyethylene (HDPE) is (CH2) n.

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35. What is the chemical formula of Polypropylene (PP)?

1. (CH2) n
2. (C3H6)n
3. (C2H3Cl)n
4. (CH2F2)n

Answer: B) (C3H6)n

Explanation:

The chemical formula for Polypropylene (PP) is (C3H6)n.

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36. Which of the following is not true about Thermosetting materials?

1. Chemical resistance is excellent in thermosetting materials
2. Thermosets are not resistant to heat
3. Electrical insulation is provided by thermosetting polymers
4. Thermosetting materials are resistant to impact

Answer: B) Thermosets are not resistant to heat.

Explanation:

Thermosets are resistant to heat.

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37. Does Thermosetting materials offer adhesive characteristics?

1. Yes
2. No

Answer: A) Yes

Explanation:

Thermosetting materials offer excellent adhesive characteristics.

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38. Which of the following is an example of Thermosetting materials?

1. Phenolic resins
2. Melamine resins
3. Epoxy resins
4. All of the above

Answer: D) All of the above

Explanation:

Phenolic resins, Melamine resins, and Epoxy resins are examples of Thermosetting materials.

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39. Higher sulphuric acid concentrations can ____ corrosion rates.

1. Increase
2. Decrease

Answer: A) Increase

Explanation:

Higher sulphuric acid concentrations can increase corrosion rates.

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40. Which is widely employed as a sacrificial anode in applications involving water-immersed steel structures, such as pipelines?

1. Aluminium
2. Titanium
3. Iron
4. Zinc

Answer: D) Zinc

Explanation:

In applications requiring steel structures submerged in water, such as pipelines, zinc is typically employed as a sacrificial anode.

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41. Metals having higher negative potentials are corroded ____.

1. Faster
2. Slower
3. No effect

Answer: A) Faster

Explanation:

Metals having higher negative potentials, such as zinc or magnesium, are more active and corrode faster.

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42. Alloying elements can ____ corrosion resistance.

1. Worsen
2. Improve

Answer: B) Improve

Explanation:

By generating protective surface coatings, alloying elements can improve corrosion resistance.

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43. Electroless plating is also known as ____.

1. Auto-generated plating
2. Principle integrating plating
3. Electron less plating
4. Autocatalytic plating

Answer: D) Autocatalytic plating

Explanation:

Electroless plating is also known as Autocatalytic plating.

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44. An external electrical current is not required for ____ plating.

1. Electroplating
2. Electroless plating

Answer: B) Electroless plating

Explanation:

An external electrical current is not required for electroless plating.

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45. Which allows for more control over the dispersion of metal ions?

1. Electroplating
2. Electroless plating

Answer: A) Electroplating

Explanation:

An external electrical Explanation: Electroplating allows for more control over the dispersion of metal ions.

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46. Which of the following aid in the management of paint viscosity, ensuring appropriate application and reducing sagging or leaking?

1. Deformers
2. Thickeners
3. Rheology modifiers
4. Wetting agents

Answer: B) Thickeners

Explanation:

Thickeners aid in the management of paint viscosity, ensuring appropriate application and reducing sagging or leaking.

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47. Which of the following has the slower deposition rate?

1. Electroless plating
2. Electroplating
3. None

Answer: A) Electroless plating

Explanation:

Electroless plating has a slower deposition rate than electroplating.

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48. What type of corrosion will occur in a situation where a steel pipe has been buried underground in corrosive soil?

1. Soil corrosion
2. Pitting corrosion
3. Uniform corrosion
4. Immersion corrosion

Answer: A) Soil corrosion

Explanation:

A steel pipe that has been buried underground in corrosive soil, in this situation soil corrosion will occur.

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49. Which type of Corrosion occurs when oxygen and moisture are present, causing localized attack?

1. Soil corrosion
2. Pitting corrosion
3. Uniform corrosion
4. Immersion corrosion

Answer: B) Pitting corrosion

Explanation:

Corrosion that occurs when oxygen and moisture are present, causing localized attack is Pitting corrosion.

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50. What is the chemical name of rust?

1. Hydrated Ferro oxide
2. Hydrated ferric oxide
3. Hydrated ferrous oxide

Answer: B) Hydrated ferric oxide

Explanation:

The chemical name of rust is Hydrated ferric oxide.

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