The two trolleys shown above have been manufactured from different materials and have been finished in different ways.
Fluidisation (plastic coating)
The red trolley on the right is made from tubular steel and has been plastic coated in polythene, PVC or cellulose acetate butyrate. The steel has been dipped into plastic to protect it from corrosion. Common examples of other (fluidised) products are refrigerator shelves, screwdrivers, shopping trolleys, metal furniture, dish draining board baskets etc.
The steel has been heated and dipped into a tank of fluid thermoplastic powder.
Self-finishing
The trolley on the left has been made from lightweight aluminium. Aluminium is a non-ferrous metal pure metal and does not corrode when used out side. No finish is required.
Paint
The base of this trolley is made from steel and has been painted to protect it from corrosion. The base has been primed, undercoated and a number of top coats have been applied. The finish may be applied using a brush or spray painted. |
Electroplating
Parts of the above jack plane have been electroplated. A thin coating of metal is deposited upon another metal using an electroplating bath. The new surface looks more attractive and protects the steel underneath from corrosion, friction and chemical attack.
In this case chrome plating has been used to protect the steel. Cutlery and some cheaper forms of jewellery may be coated. |
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