18 Questions
What is the term for the corrosion that occurs when there is a difference in oxygen availability between two areas of a metal?
Differential aeration 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
Which of the following materials is self-protected against corrosion?
Aluminum
What is the process of converting the surface of aluminum into a decorative, durable, and corrosion-resistant finish called?
Anodizing
Why should copper bolts not be used in contact with aluminum?
To prevent galvanic corrosion
What is the reason why ships sailing in water corrode below the water line?
Due to the difference in oxygen availability
What is the primary reason for corrosion in the metal portion below the water line in a water storage tank?
Lower oxygen concentration
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
In stressed corrosion, what is the role of the stressed portion of the metal?
It becomes an anode and undergoes corrosion
What is the common feature of both pitting corrosion and differential aeration corrosion?
Formation of an oxygen concentration cell
Which type of corrosion is most destructive?
Pitting corrosion
What is the primary factor that influences the rate of corrosion in pitting corrosion?
Ratio of anodic to cathodic areas
What is the primary reason for corrosion in metals?
Extraction of metals from ores requires energy, making them unstable
Which of the following is an example of metallic corrosion?
Rusting of iron
Why does India lose a significant amount of money annually due to corrosion?
Due to the destruction of infrastructure and assets
What is the result of the corrosion process?
Transformation of pure metal into its undesired metallic compound
What is thestable state of metals in nature?
Ore
What is the reverse process of metallurgy?
Metallic corrosion
Test your understanding of corrosion mechanisms, including wet corrosion of iron and the electrochemical theory. Explore the concepts of anodic and cathodic areas, and how they affect corrosion. This quiz is based on the 2022-23 syllabus from the Department of Chemistry, RIT.
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