Finishes

Question 1

finishes

Answer 1

are added to a products surface after production to improve its functionality and/or aesthetic.

Question 2

why use a finish?

Answer 2

stop corrosion
prevent decay
stop UV light degradation
defend against attack (insects/fungi)
improved hygiene
make a product tougher
to insulate
decorate
colour
make a product smooth

Question 3

types of wood finish

Answer 3

penetrating finish
surface finish

Question 4

penetrating finish

Answer 4

infiltrates wood pores and fibres for a beautiful decorative finish
- Danish oil
- linseed oil
- stain
- pressure coated

Question 5

surface finishes for wood

Answer 5

leaves a hard, protective film over the top of the wood to create a buffer between the wood and anything it contacts.
- wax
- polyurethane
- lacquer
- oil based paint

Question 6

types of metal finish

Answer 6

bluing
galvanising
oil based paint
anodising
lacquer
powder coating
plastic coating

Question 7

bluing

Answer 7

a passivation process in which steel id partially protected against rust using a black oxide coating.
(named after the blue-black appearance of the resulting protective finish.
- quick, cheap, effective
- mainly done on steel
- 300oc

Question 8

galvanising

Answer 8

process of applying a protective zinc coating to steel or iron, to prevent rusting.
- 450oc molten zinc
- 30o dipping angle
- 70-85 microns thick
- costs more

Question 9

oil based paint

Answer 9

• requires a primer (stick and smooth) then a top coat.
• spray on
• chips, exposing metal underneath

Question 10

anodising

Answer 10

an electrolytic process for producing thick oxide coatings, usually on aluminium and its alloys.
- coating within the pores of the metal.
- hardwearing/hard to scratch
- doesn’t add sufficient depth to the surface.
- prevents oxidation
- electrolytic anodising discovered in 1911

Question 11

barrier layer

Answer 11

1st layer of aluminium, its compact. little pores on the surface holds colour.

Question 12

hydration sealing

Answer 12

100oc steam

Question 13

impregnation sealing

Answer 13

deionised water
mineral salts
25-30oc

Question 14

lacquer

Answer 14

brass and other materials are easy to protect with a durable clear lacquer coating. sprayed on

Question 15

powder coating

Answer 15

• electrostatic
• goes on smoother
• cost effective

Question 16

plastic coating

Answer 16

metal heated and placed in an aerated powder polymer. hot dip

Question 17

abrasives (for plastic)

Answer 17

used to remove blemishes or marks before polish is applied and the plastic is buffed to a good finish.
- emery cloth
- silicon carbide
- steel wool

Question 18

vinyl transfers

Answer 18

applied to give plastic decoration/branding

Question 19

plastic final finish

Answer 19

many plastic goods are produced with their final finish, unlike wood/metal. can be moulded to have a certain texture or finish.