GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018
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Subject Code:2162108 Date:30/11/2018Subject Name:Material Degradation and Prevention
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
MARKS
Q.1 (a) What do you understand by corrosion rate? Describe corrosion rate 03
expression.
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(b) Discuss the importance of study the corrosion behavior of metals and 04
alloys.
(c) Justify the role of proper material selection and design aspects in corrosion 07
protection with suitable examples of each.
Q.2 (a) Discuss the effect of anodic area and pH on corrosion rate. 03
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(b) With suitable example explain how corrosion can be used as an useful 04
process.
(c) Discuss the thermodynamic principle of corrosion and justify the 07
requirement of reference electrode for corrosion study.
OR
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(c) What is galvanic series? Discuss it’s applicability in corrosion studies. 07
Also give limitations of galvanic series.
Q.3 (a) Explain the reason for breakdown of the passive layer in pitting corrosion. 03
(b) Explain mechanism of inter granular corrosion in stainless steel. 04
(c) Discuss causes, mechanism and way-of prevention of crevice corrosion. 07
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OR
Q.3 (a) Give the difference between Physical vapor deposition and chemical vapor 03
deposition.
(b) Draw passivity curve(s-curve) for active-passive metal and discuss it. 04
(c) Write a note on Chemical degradation of non-metallic materials. 07
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Q.4 (a) Prior to coating, metal surface needs cleaning. Comment on it. 03
(b) Explain impressed current cathodic protection method. 04
(c) What do you mean by Piling-Bedworth ratio? Discuss its importance and 07
applications in corrosion study.
OR
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Q.4 (a) Explain the difference between corrosion protection by noble coating and 03
active coating with suitable examples.
(b) Explain sacrificial anode cathodic protection method. 04
(c) With the help of proper examples, explain that how the inhibitors are 07
helpful in corrosion control.
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Q.5 (a) Discuss the role of Plasma in surface engineering. 03
(b) Explain evaporation Physical vapor deposition technique. 04
(c) Explain the Pin on disk method used for wear rate measurement using 07
schematic diagram.
OR
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Q.5 (a) During electroplating, pH of bath is strictly maintained. Give reason. 03
(b) Describe Laser cladding technique for corrosion protection. 04
(c) What do you mean by surface composites? Explain the method of surface 07
modification by Friction stir processing.
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This download link is referred from the post: GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
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