F 03000CH366052103 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Sixth Semester B.Tech Degree Regular and Supplementary Examination July 2021

Course Code: CH366
Course Name: CORROSION ENGINEERING
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) Differentiate activation polarization and concentration polarization with suitable (7)
diagrams.
b) Discuss the direct and indirect economic costs of corrosion. (8)
2 a) A steel rod having a surface area of 31.89 cm’ is dipped in an electrolyte (3)
solution. 0.017 g of steel was lost after an exposure time of 7 hours. Density of

steel is 8.05 g/cm*, Determine the corrosion rate of the sample in ‘mpy’.

b) Explain the effect of velocity and temperature on corrosion. (5)
c) Explain the mechanism of crevice corrosion with appropriate diagrams. (7)
3 ஐ List and explain about three beneficial applications of galvanic corrosion. (3)
b) Compare weld decay and knife-line attack. (6)

c) What is stress corrosion cracking and discuss about the effect of environmental (6)
factors on stress corrosion.
PART छ
Answer any two full questions, each carries 15 marks.
4 a) Explain Tafel extrapolation method. (8)

b) What are coatings, its components and explain flamespraying method of (7)

applying coatings.
5 a) Explain galvanostatic method of corrosion testing. (7)
b) What are inhibitors, different types of inhibitors, and limitations of inhibitors? (8)
6 a) Explain cathodic protection method of corrosion prevention. (7)
b) Explain linear polarisation method of corrosion testing. (8)

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