Engineering Chemistry – II - Corrosion - Unit 2 - Questions

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Corrosion
1. Define the term corrosion and differentiate it from erosion
2. Discuss the different types of corrosion that we commonly come across.
3. Discuss the importance of design and material selection in controlling
corrosion.
4. State two conditions for electrochemical corrosion to occur
5. Indicate the principles of cathodic protection?
6. Discuss about the use of inhibitors in corrosion control?
7. What is cathodic protection? Under what conditions is this protection
more useful?
8. Explain with suitable examples the corrosion due to differential aeration
and dry corrosion?
9. Explain the two important factors that influence the corrosion of metals?
10. Mention the theories of corrosion and explain any one of them in detail.
11. What are the differences between EMF and Galvanic Series?
12. List the discrepancies of EMF series
13. What is meant by electrochemical corrosion?
14. What is the mechanism by which rusting occurs?
15. Distinguish between wet and dry corrosion
16. A copper equipment should not possess a steel component. Why?
17. State Pilling Bedworth rule.
18. How does the corrosion product influence further corrosion.
19. What are the factors that influence corrosion?
20. How is the metallic surface prepared by various methods before
electroplating?
21. Explain why magnesium corrodes faster when it is in contact with
copper than when it is in contact with iron.
22. How is Ni plating done by electroless plating?
23. Explain the control of corrosion by the use of sacrificial anodes and by
impressed current cathodic protection.
24. Mention any two differences between electroplating and electroless
plating.
25. Bolt and nut made of the same metal is preferred in practice. Why?
26. What is cathodic protection?
27. Discuss the mechanism of electrochemical corrosion.
28. What is paint? What are the constituents and functions of paints?
29. Write in detail about the galvanic corrosion and differential aeration
corrosion.
30. What are corrosion inhibitors? Classify different types of inhibitors with
examples.
31. Describe briefly the important parameters involved in electroplating.
32. What is corrosion? What is rust?
33. Why does corrosion of water filled steel tanks occur below water line?
34. Discuss the mechanism of chemical and electrochemical corrosion.
35. Write a note on pitting corrosion, stress corrosion and cathodic
protection.
36. What is a sacrificial anode? Give two examples.
37. Define corrosion and explain the various factors influencing corrosion of
a metal.
38. What is pitting corrosion?
39. Write a brief note on Differential aeration corrosion.
40. Discuss how the nature of the metal influences the rate of corrosion.
41. Explain the process of electroplating with a suitable example. Mention
the uses of electroplating.
42. Explain electrochemical theory of corrosion with suitable example.
43. What are the conditions for electrochemical corrosion?
44. How is pilling Bedworth ratio related to the protective capacity of an
oxide layer?
45. What is a sacrificial anode? How does it protect a submerged pipeline?
46. What is electro less plating? Explain electro less plating of nickel with
relevant equations and mention its advantages over electroplating.
47. What are the factors affecting electroplating?
48. Explain electroplating of Gold with a neat flow chart.
49. What are the important constituents of paint? Explain the function of
each.
50. What is meant by throwing power of the plating bath?
51. What are the disadvantages of electro less plating?
52. What are the limitations of electro plating?
53. What is the relation between %P and property of electro less plated
substrate.
54. What are the applications of electro less plating?
55. How can galvanic corrosion be prevented?
56. If the SVR of Ni, Cr, and W are 1.6, 2.0 and 3.6 respectively, arrange
them in descending order of activity.
57. What type of corrosion will occur on a piece of iron covered with dust?
58. Why does any impure metal corrode faster than pure metal under
identical conditions?
59. What are the draw backs of cathodic protection?
60. Will a piece of steel covered with ice undergo corrosion? Why?
 

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