metal finishes

Question 1

cellulose and acrylic paint

Answer 1

low cost metals
brush/spray
red oxide primer often used

colour and teture created
barrier against corrosion
provide graphic effects

Question 2

electro-plating

Answer 2

protective layer
hardwearing
enhance aesthetics
on silver, gold, tin or zinc
placed in container with electrolyte solution
direct current applied
product attracts donor metal and product is electroplated

Question 3

dip coating

Answer 3

dipped in tank of polymer powder or molten metal
heat from metal melts polymer powder
air cooled and set evenly
coat hangers
outdoor play equipment
barrier against corrosion

Question 4

powder coating

Answer 4

statically charged
resin sprayed on through airgun
strong attraction between powder and product
baked and melted
protects from corrosion
aesthetics
hardwearing
washing machines, dishwasher, fridgebodies

Question 5

galvanising

Answer 5

protective zinc coating to iron or steel
prevents rusting
most common is hot dip galvanising, in which steel sections are submerged in a bath of molten zinc
car bodies, bikes
cool roll sheet metals

Question 6

sealants

Answer 6

applied with cloth
protects from decay and tarnishing
automative industry against weathering
road salts and insect attack

Question 7

preservatives

Answer 7

temporary or long term protection
moulds and dies for preventing fingertips showing on surfaces

Question 8

anodising

Answer 8

electric current passes through electrolyte solution from part to be treated to the negative cathode
aluminium oxide layer builds up
aluminium products
increase hardness and toughness
provides colour
mobile phones

Question 9

cathodic protection

Answer 9

controls rate of corrosion
protects steel structures buried in soil or water
ship hulls
pipelines
offshore platforms