Unit 5 - Practice Quiz

1 Which of the following best defines corrosion?

2 According to the Pilling-Bedworth rule, a metal oxide layer is protective if the volume of the oxide is:

3 Which mechanism is responsible for dry corrosion?

4 In electrochemical corrosion, the part of the metal undergoing corrosion acts as the:

5 During electrochemical corrosion in an acidic environment, the cathodic reaction results in:

6 The formation of rust on iron in a neutral aqueous environment is primarily driven by which cathodic mechanism?

7 The chemical formula for rust is generally represented as:

8 In a Galvanic cell formed by Copper and Zinc, which metal corrodes?

9 Which of the following conditions is necessary for Galvanic corrosion to occur?

10 In a concentration cell, corrosion occurs at the part of the metal exposed to:

11 Which principle explains differential aeration corrosion?

12 A metal rod is half-immersed in water. Where is the corrosion most likely to occur?

13 Which type of corrosion is characterized by the formation of deep, localized holes or cavities?

14 Why is pitting corrosion considered more dangerous than uniform corrosion?

15 Intergranular corrosion typically occurs at:

16 Weld decay in stainless steel is a specific form of:

17 Soil corrosion is primarily influenced by which property of the soil?

18 Which factor regarding the nature of the metal tends to increase the rate of corrosion?

19 What happens when the anodic area is much smaller than the cathodic area?

20 How does an increase in temperature generally affect the rate of corrosion?

21 If the corrosion product (oxide layer) is volatile (e.g., ), the corrosion:

22 Passivity refers to the phenomenon where a metal:

23 Which of the following is an example of cathodic protection?

24 In sacrificial anodic protection of an underground iron pipeline, which metal is commonly used as the anode?

25 The method of Impressed Current Cathodic Protection involves:

26 Anodic inhibitors work by:

27 Which of the following is a Ceramic coating?

28 The primary advantage of ceramic coatings is their ability to withstand:

29 Electroplating is the process of:

30 In the electroplating process, the article to be plated is made the:

31 The electrolyte used in electroplating must contain:

32 What is Galvanization?

33 What is Tinning?

34 Why is Tinning preferred for food containers over Galvanizing?

35 In a tinned iron container, if the coating is scratched, the iron corrodes rapidly because:

36 Caustic embrittlement is a type of corrosion primarily found in:

37 The phenomenon where a metal cracks under the combined action of tensile stress and a corrosive environment is called:

38 Season cracking of brass is caused by:

39 Which of the following creates a crevice corrosion site?

40 To prevent galvanic corrosion in a design using dissimilar metals, one should:

41 In Microbiological Corrosion, anaerobic bacteria like Desulfovibrio desulfuricans promote corrosion by:

42 Corrosion fatigue is the failure of metal due to:

43 Which cleaning process typically precedes electroplating to remove grease and oil?

44 What is the function of Pickling in metal finishing?

45 In the context of the Pilling-Bedworth rule, if the ratio is significantly greater than 2, what happens?

46 Which metal is typically used as a coating in anodizing?

47 The tendency of a metal to undergo corrosion can be predicted by:

48 In Water-line corrosion, the cathodic reaction occurs at:

49 Which of the following represents a proper design to minimize corrosion?

50 During Differential Aeration Corrosion, the electron flow in the metal is from: