Corrosion and Control: Important part-B questions

IMPORTANT PART B QUESTIONS

1. What is chemical corrosion? Explain the mechanism of oxidation corrosion.

2. Explain chemical corrosion. Also explain the intensity of corrosion varying with the nature of oxide layer formation over metal.

3. Explain the various types of corrosion.

4. Differentiate between Chemical and electrochemical corrosion. Mention any four factors that affect electrochemical corrosion.

5. State and explain pilling‒bedworth rule.

6. Discuss the mechanism of electrochemical corrosion,

7. (i) Describe the mechanism of electrochemical corrosion by hydrogen evolution and oxygen absorption.

(ii) Why steel screws in a brass marine hardware corrode? Explain.

8. When does the electrochemical corrosion occur? Describe the mechanism of electrochemical corrosion.

9. How is Galvanic corrosion occur?

10. Discuss the mechanism of chemical and electrochemical corrosion.

11. Explain the principle of electrochemical corrosion with suitable example.

12. Explain water‒line corrosion.

13. What should be the nature of corrosion product to prevent further corrosion?

14. Deposition of oil or dust on metal surfaces for a long period is undesirable. Give reasons.

15. Mention the possible means of rendering a metal cathodic to protect it from corrosion.

16. Describe the mechanism of differential aeration corrosion taking pitting as example.

17. Write a note on pitting corrosion and cathodic protection.

18. Define corrosion and explain the various factors influencing corrosion of a metal.

19. What are factors, influencing chemical and electrochemical corrosion.

20. Explain the factors connected with metal that effect corrosion.

21. Explain the control of corrosion by the use of sacrificial anodes and by impressed current cathodic protection.

22. What is cathodic protection? Explain the sacrificial anode and impressed current techniques for the prevention of corrosion.

23. Describe corrosion control through impressed current method.

24. How is corrosion prevented in shiphulls and transmission line towers. Explain.

25. Write a brief note on

(i) Cathodic protection by sacrificial anode

(ii) Differential aeration corrosion.

26. Explain differential aeration corrosion with an example.

27. What is differential aeration corrosion? Write its mechanism. Give any illustrations that show differential corrosion.

28. Describe the sacrificial anode methods of corrosion control.

29. Explain differential aeration corrosion and galvanic corrosion with suitable illustrations.

30. What is galvanic series? Explain the applications of it.

31. What is paint? What are the consistents and functions of paints?

32. Write detailed notes on pigments.

33. What are the constituents present in paint, varnish and lacquer? Mention their special qualities and uses?

34. Describe the mechanisms of drying of an oil paint.

35. Write briefly on types of varnish and their utility.

36. Write notes on lacquers.

37. Explain the various constituents and functions of enamels.