Dealuminization of Aluminum Bronze

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Abstract
Though rarer than dezincification in brass, dealuminization can occur in aluminum bronze, and such attack can constitute a failure hazard. A case of a dealuminization failure in a cylinder valve is cited. This failure was attributable to selective corrosion of the aluminum-rich phase in an aluminum silicon bronze having a duplex structure. In the process of selecting a more suitable material for the cylinder valves, dealuminization studies were carried out on samples of single and two phase aluminum bronzes which were exposed to aqueous hydrofluoric acid, the corrosive agent to which the valve failures were affixed. Alpha aluminum bronze suffered no harmful attack; the duplex aluminum bronze, regardless of its heat treated structure, suffered a selective dealuminization attack which caused a severe loss in ductility.

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