3.11 Finishes

What is the importance of finishes?

To enhance visual appeal and protect surfaces from damage, decay, and wear.

Types of metal finishes

Galvanising, anodising, electroplating, painting, oil/grease, polish, plastic dip coating, powder coating

Galvanising - how, why and example

chemical process coats base with zinc to prevent corrosion. Iron - hinges, nails

Anodising - material, how and why, example

aluminium, via electrolysis to increase corrosion resistance. eg: cookware

Electroplating

iron, chemically applied to add another layer of metal on top to prevent corrosion. Used in engine parts

Paint

prevents corrosion and enhances visual appeal. Used in post boxes

Oil/grease

protective layer prevents corrosion and reduces friction. Used in machinery

Polish

Via buffing machine or by hand using cloth. Adds shine, used for brass legs

Plastic dip coating

Metal is dipped into thermoplastic coating, removed and left to cool. Used in handles

Powder coating

Powder is applied via electrostatic spray gun and then product is heated so the powder melts. Enhances visual appeal and adds strength. Used in washing machines

Wood finishes

wax polish, french polish, varnish, oil, paint

Plastic finish

Buffing compound - used for injected moulded plastics to remove rough edges

Self finishing materials

built in finish

special finish

protective finish

surface finish

surfaces that enhences appereance