The Selection of Finishes for Communication Equipment

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Abstract
The factors governing the selection of a finish are discussed and the properties of the available material are considered in relation to them. The constructional materials are steel, copper alloys, and aluminium alloys, and treatments to give protection while retaining other properties include electroplating, metal spraying, chemical treatment and organic finishing. Special consideration is given to the relative merits of zinc and cadmium coatings for the protection of small parts, the uses of silver, rhodium and gold for contacts and other electrical applications, and requirements for soldering and spot-welding. Modern trends are discussed with mention of printed circuits, miniaturisation with the increased hazard from whisker growth and magnetic drums as memory devices.

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