On the Relation between Dealuminization and Anodic Polarization of Aluminium Bronze

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  • アルミニウム青銅の脱アルミニウム腐食と陽極分極曲線の関係について
  • アルミニウム セイドウ ノ ダツアルミニウム フショク ト ヨウキョク ブンキョク キョクセン ノ カンケイ ニ ツイテ

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Abstract

The recent widespread use of aluminium bronze in industry may be attributed to its high mechanical properties and resistance to corrosion. In certain corrosive environments, however, aluminium bronze can suffer a selective corrosion known as dealuminization. This selective corrosion phenomenon results in a loss of aluminium from the alloy. Dealuminization in aluminium bronze is similar in mechanism to the dezincification that occurs in brass. Dealuminization was studied by means of rapid dipping tests and anodic polarization measurements on various Al-Cu alloys, in which the content of Al was not larger than 12%, in solutions of CuSO4(1/2 mol), CH3COONa(1/3 mol), KCl(1/3 mol) and CH3COOH(2/3 mol). The pH value of the above mentioned solution was 3.3. The results obtained were as follows: (1) The anodic current density at −0.05 V(vs. S.C.E.) corresponds to the dealuminization degree of each alloy. (2) Only alpha Al-Cu alloys have high resistivity to the dealuminization in aluminium bronze. (3) The other phases of Al-Cu alloys are more easily dealuminized than the alpha phase. (4) The dealuminization degree of 12%Al-Cu alloys is remarkably influenced by heat treatment.

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