UNIT EIGHT - ANSWER EACH QUESTION 1.  Explain the difference between coating and cladding 2. Describe the two main...

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Mechanical Engineering

UNIT EIGHT - ANSWER EACH QUESTION

1.  Explainthe difference between coating and cladding

2. Describe the two main methods of painting: dipping and spraying(manual, automatic or electrostatic).
a) State the characteristic of each method.
b) Identify materials suitable for each method.

3. Describe the electroplating process.
a) List typical plating materials and give reasons for theiruse.

4. Explain the process of anodizing and state typicalapplications.

5. Classify vapour deposition processes into physical vapourdeposition (PVD) and chemical vapour deposition (CVD).
a) Describe the principle of each process.
b) Identify applications of each process.

6. Recognize the importance of thermal spraying.
a) Explain the principle of thermal spraying.
b) Identify typical thermal spraying processes according to thetechnology used to melt the coating material.:- oxyfuel flame,electric arc and plasma arc.

Answer & Explanation Solved by verified expert
3.9 Ratings (656 Votes)
1 Cladding It is the process of sandwiching the base metal between two thin layers of coating metal by hotrolling the composite to produce a firm bonding The coat metals are usually metals of least reactivity Cu Ni Ag Pt Ti The cladding layer should be very thin and its thickness is only 5 of the total composite metal Example Duraluminium sandwiched between Al sheets and hot rolled to produce Alkad composite which is free from stress corrosion Coating It is a method of deposition of one material on    See Answer
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