The present invention relates to a copper alloy composition comprising copper as a main component and aluminum, zinc, manganese, and silver or tin added thereto. The copper alloy composition does not discolor in the atmosphere or in salt water and cleaning solution, It has excellent weatherability and corrosion resistance and seawater corrosion resistance that can be maintained, as well as excellent strength and workability.;Therefore, the copper alloy of the present invention can be usefully used for a ship screw, a heat exchanger part of a seawater desalination plant, a valve train, an automobile part, a hydraulic machine part, an indoor structure, a decorative article or a kitchen utensil.
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