Effect of Isothermal Transformation on Dealuminization of Eutectoid Aluminium Bronze

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  • 共析アルミニウム青銅の脱アルミニウム腐食におよぼす恒温変態の影響
  • キョウセキ アルミニウム セイドウ ノ ダツアルミニウム フショク ニ オヨボス コウオン ヘンタイ ノ エイキョウ

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Abstract

As a reason for the widespread use of aluminium bronze in industrial engineering may be cited its high mechanical and excellent corrosion resisting properties. In certain corrosive environments, however, aluminium bronze can suffer a selective corrosion known as dealuminization. Dealuminization in aluminium bronzes is similar in mechanism to the dezincification that occurs in brasses. It is generally known that all phases in aluminium bronze except α phase are susceptible to dealuminization. The effect of isothermal transformation on dealuminization of a eutectoid aluminium bronzes was studied by means of rapid dipping corrosion tests and anodic polarization measurements with a potentiostat in several kinds of solutions. The results obtained were as follows: (1) Dealuminization increased with advance of isothermal transformation, and remarkable increase of dealuminization was observed in alloy in which precipitation of pearlite was detectable. (2) Effect of the isothermal transformation on dealuminization was most evident in acidic aqueous solution.

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