IV B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 ELECTRO METALLURGY AND CORROSION Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) What is Hauffe’s valency rule? Explain.
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(b) ‘Addition of Nickel decreases the oxidation rate of pure chromium’. Explain the valid reasons.
(c) An Electrode potential in a silver half cell is 0.78 V .Calculate the concentration of Ag+ ions in the Electrolyte. [5+6+5]
(b) Discuss the following
or
2. (a) How are conductors classified? Define molor conductivity and discuss the factors affecting conductivity of electrolytes. i. Current density ii. Limiting current density iii. Cathode current efficiency.
[8+8]
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3. (a) Discuss the recovery of copper by electrowinning process.
(b) Explain the importance of hydrogen over voltage in aqueous electrolysis [8+8] 4. Discuss and explain the following: (a) Atmospheric corrosion
(b) Intergranular corrosion
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(c) Underground corrosion. (d) Stress corrosion.
[4 × 4]
5. (a) What do you understand by the term ‘ corrosion’ ? Explain the mechanism of corrosion in detail. [9+7]
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(b) Explain why does the mechanism generally occur at the ‘Anode’
6. Write short notes on the following (a) Use of noble metals as protective coatings.
(b) Design to avoid formation of galvanic cell (c) Season cracking [4 × 4]
(d) Surface protection by paints.
7. (a) Explain the effect of cathodic- Anodic area ratio on galvanic corrosion.
1
Code No: 17087
NR
Set No - 1
(b) Enlist the factors and explain which can cause increased rate of anode corrosion in galvanic cells. [7+9] 8. Discuss the following methods of anodizing treatments. (a) BENGOUGH [Chromic acid process] [8+8]
in
(b) ALUMILITE [Sulphuric acid process]
Aj
nt
uW
or
ld .
?????
2
Code No: 17087
NR
Set No - 2
1. (a) Discuss the recovery of copper by electrowinning process.
in
IV B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 ELECTRO METALLURGY AND CORROSION Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
(b) Explain the importance of hydrogen over voltage in aqueous electrolysis [8+8] 2. (a) Explain the effect of cathodic- Anodic area ratio on galvanic corrosion.
(b) Enlist the factors and explain which can cause increased rate of anode corrosion in galvanic cells. [7+9]
4. Discuss the following methods of anodizing treatments. (a) BENGOUGH [Chromic acid process] (b) ALUMILITE [Sulphuric acid process]
[8+8]
5. (a) How are conductors classified? Define molor conductivity and discuss the factors affecting conductivity of electrolytes.
nt
(b) Discuss the following
i. Current density ii. Limiting current density iii. Cathode current efficiency.
[8+8]
Aj
6. Write short notes on the following (a) Use of noble metals as protective coatings.
(b) Design to avoid formation of galvanic cell (c) Season cracking [4 × 4]
(d) Surface protection by paints.
7. (a) What do you understand by the term ‘ corrosion’ ? Explain the mechanism of corrosion in detail. (b) Explain why does the mechanism generally occur at the ‘Anode’ 3
[9+7]
Code No: 17087
NR
Set No - 2
8. (a) What is Hauffe’s valency rule? Explain. (b) ‘Addition of Nickel decreases the oxidation rate of pure chromium’. Explain the valid reasons.
in
(c) An Electrode potential in a silver half cell is 0.78 V .Calculate the concentration of Ag+ ions in the Electrolyte. [5+6+5]
Aj
nt
uW
or
ld .
?????
4
Code No: 17087
NR
Set No - 3
1. (a) Discuss the recovery of copper by electrowinning process.
in
IV B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 ELECTRO METALLURGY AND CORROSION Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
(b) Explain the importance of hydrogen over voltage in aqueous electrolysis [8+8] 2. (a) Explain the effect of cathodic- Anodic area ratio on galvanic corrosion.
(b) Enlist the factors and explain which can cause increased rate of anode corrosion in galvanic cells. [7+9]
or
3. (a) What do you understand by the term ‘ corrosion’ ? Explain the mechanism of corrosion in detail. (b) Explain why does the mechanism generally occur at the ‘Anode’ 4. Write short notes on the following
[9+7]
(a) Use of noble metals as protective coatings.
uW
(b) Design to avoid formation of galvanic cell (c) Season cracking
(d) Surface protection by paints.
[4 × 4]
5. (a) What is Hauffe’s valency rule? Explain. (b) ‘Addition of Nickel decreases the oxidation rate of pure chromium’. Explain the valid reasons.
nt
(c) An Electrode potential in a silver half cell is 0.78 V .Calculate the concentration of Ag+ ions in the Electrolyte. [5+6+5]
6. Discuss and explain the following: (a) Atmospheric corrosion
7. (a) How are conductors classified? Define molor conductivity and discuss the factors affecting conductivity of electrolytes. (b) Discuss the following i. Current density ii. Limiting current density 5
Code No: 17087
NR
Set No - 3
iii. Cathode current efficiency.
[8+8]
8. Discuss the following methods of anodizing treatments. (a) BENGOUGH [Chromic acid process] [8+8]
in
(b) ALUMILITE [Sulphuric acid process]
Aj
nt
uW
or
ld .
?????
6
Code No: 17087
NR
Set No - 4
in
IV B.Tech I Semester Supplimentary Examinations,Nov/Dec 2009 ELECTRO METALLURGY AND CORROSION Metallurgy And Material Technology Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Explain the effect of cathodic- Anodic area ratio on galvanic corrosion.
2. (a) What is Hauffe’s valency rule? Explain.
ld .
(b) Enlist the factors and explain which can cause increased rate of anode corrosion in galvanic cells. [7+9]
(b) ‘Addition of Nickel decreases the oxidation rate of pure chromium’. Explain the valid reasons.
or
(c) An Electrode potential in a silver half cell is 0.78 V .Calculate the concentration of Ag+ ions in the Electrolyte. [5+6+5]
3. (a) What do you understand by the term ‘ corrosion’ ? Explain the mechanism of corrosion in detail.
uW
(b) Explain why does the mechanism generally occur at the ‘Anode’
[9+7]
4. Discuss the following methods of anodizing treatments. (a) BENGOUGH [Chromic acid process] (b) ALUMILITE [Sulphuric acid process]
[8+8]
5. (a) Discuss the recovery of copper by electrowinning process. (b) Explain the importance of hydrogen over voltage in aqueous electrolysis [8+8]
nt
6. Write short notes on the following
(a) Use of noble metals as protective coatings.
(b) Design to avoid formation of galvanic cell (c) Season cracking
[4 × 4]
Aj
(d) Surface protection by paints.
7. (a) How are conductors classified? Define molor conductivity and discuss the factors affecting conductivity of electrolytes. (b) Discuss the following i. Current density ii. Limiting current density iii. Cathode current efficiency.
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