Powder Coating and Anodizing

Q.

Why steel is used in railway tracks? Why not other metals?

Q.

Which of the following can be used to prevent rusting of iron?

1. Painting

2. Galvanising

3. Chrome plating

4. All of the given options are correct.

Q.

……….is a process of forming a thick oxide layer on the …… of metal. This oxide layer is ….. and prevents the metal from further …….

Q. The iron articles coated with powder coating method are:

1. durable
2. hard
3. soft
4. attractive

Q. Define anodizing. How is it done?

Q. Electrostatic spray deposition is the process involved in .

1. anodizing
2. powder coating
3. sintering

Q. Which of the following methods can be used to prevent rusting?

1. Apply a coat of paint or grease
2. Deposit a layer of a metal like chromium or zinc on iron
3. Both of the above
4. None of the above

Q.

The process of coating zinc on iron to prevent corrosion is known as _______ .

1. Peptization

2. Galvanization

3. Rusting

4. Precipitation

Q. is a process used to form a layer of on the surface of metals.

1. Anodizing
2. Powder coating
3. oxides
4. hydrogen

Q. What are the advantages of powder coating?
[2 mark]

Q.

Match the Columns

Column 1	Column 2
Weak electrolyte	Bathroom Fitting
Tin	Ornaments
Silver	Water caps
Gold	Knives
Chromium	Tin cans
Nickel	${\mathrm{CH}}_3\mathrm{COOH}$

Q. What is anodising? Briefly explain anodising. [2 marks]

Q. Which of the following methods cannot be employed in order to prevent rusting?

1. Covering the metal surface by paint
2. Covering the metal surface by powder coating
3. Allowing the metal surface to interact with moisture
4. Covering the metal surface by anodizing

Q. Anodizing is done by ________.

1. spraying
2. electrolysis
3. kneading
4. sintering

Q. Stainless steel contains iron and :

1. Zn
2. Cu
3. Al
4. Cr

Q. Identify the advantages of powder coating over paint.

1. Hard
2. Durable
3. Attractive
4. Eco-friendly
5. Economic
6. Soft
7. Peelable
8. Costly