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Corrosion Mechanism and Electrochemical Theory

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Corrosion Mechanism and Electrochemical Theory

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Questions and Answers

What is the term for the corrosion that occurs when there is a difference in oxygen availability between two areas of a metal?

Stress corrosion

Differential aeration corrosion (correct)

Galvanic corrosion

Electrochemical corrosion

What is the primary reason for the formation of small anodic areas and large cathodic areas, leading to severe corrosion?

Insufficient concentration of inhibitor substances (correct)

Higher pH of the medium

Inherent tendency of the metal to form protective films

Nature of the metal and surface state

Which of the following materials is self-protected against corrosion?

Copper

Iron

Aluminum (correct)

Zinc

What is the process of converting the surface of aluminum into a decorative, durable, and corrosion-resistant finish called?

Anodizing Signup and view all the answers

Why should copper bolts not be used in contact with aluminum?

To prevent galvanic corrosion Signup and view all the answers

What is the reason why ships sailing in water corrode below the water line?

Due to the difference in oxygen availability Signup and view all the answers

What is the primary reason for corrosion in the metal portion below the water line in a water storage tank?

Lower oxygen concentration Signup and view all the answers

What is the term for the type of corrosion that occurs when impurities are deposited on the metal surface, inducing pitting corrosion?

Pitting corrosion by impurity deposition Signup and view all the answers

In stressed corrosion, what is the role of the stressed portion of the metal?

It becomes an anode and undergoes corrosion Signup and view all the answers

What is the common feature of both pitting corrosion and differential aeration corrosion?

Formation of an oxygen concentration cell Signup and view all the answers

Which type of corrosion is most destructive?

Pitting corrosion Signup and view all the answers

What is the primary factor that influences the rate of corrosion in pitting corrosion?

Ratio of anodic to cathodic areas Signup and view all the answers

What is the primary reason for corrosion in metals?

Extraction of metals from ores requires energy, making them unstable Signup and view all the answers

Which of the following is an example of metallic corrosion?

Rusting of iron Signup and view all the answers

Why does India lose a significant amount of money annually due to corrosion?

Due to the destruction of infrastructure and assets Signup and view all the answers

What is the result of the corrosion process?

Transformation of pure metal into its undesired metallic compound Signup and view all the answers

What is thestable state of metals in nature?

Ore Signup and view all the answers

What is the reverse process of metallurgy?

Metallic corrosion Signup and view all the answers