PreQ ESD - 2.21 Metal finishes

Preparing for a finish

Using a emery cloth , metal polish or a buffing machine to remove any grime and get a matt finish

Painting

The surface should be thoroughly degreased using white spirit. A special primer coat for metal can then be applied

Enamel gloss

paint that is less likely to flake off

Hammarite

does not require a primer coat, except on aluminium, and can be painted over rust

Lacquering

A varnish that is made of cellulose gum that gives a clear protective coat

Plastic coating

tough and waterproof finish that comes in a range of colours

How to apply a plastic coating

The product to be coated is heated in an oven, or by a blow torch, to a temperature between 200°C and 400°C. It is then plunged into a fluidised bath of polyethylene powder for a few seconds.

Fluidising

blowing cold air through the polye powder so that the powder bubbles like boiling water

Enamelling

using powdered coloured glass, which is melted, flows over the surface and then bonds to it. It is normally used as a decorative finish on copper for items of jewellery

Vitreous enamel

coating that is used for casing of washing machines and refrigerators

Anodising

used on aluminium and is a method of producing a dense, clear oxide layer that resists corrosion. The layer can be dyed with coloured inks.

Electroplating

using a process called electrolysis to coat one metal with a thin layer of another metal