在分析测试我国现役舰船海水管路系统中铝青铜管的基础上，探讨了铝青铜管在使用过程中的脱合金腐蚀机制。结果表明，铝青铜发生脱铝腐蚀，脱铝优先发生在α相与未分解的共析组织的界面处，然后向共析组织内部发展，并沿着亚稳的共析组织以选择性溶解的形式不断向合金内部扩展，形成疏松多孔的结构，使合金强度大降低。α相几乎不发生脱铝腐蚀
The dealloying mechanism of material in service was discussed on the basis of analyzing the structural morphologies of aluminum bronze tube used in sea water pipe line system.The microstructure and morphologies of aluminum bronze before and after being corroded were examined by optical microscope and SEM.The compositions of corroded aresa were analyzed by EDS and the phases before and after cossosion were determined by XRD.The results revealed that dealuminizationcorrosio was obseived in aluminum bronze tube, and the phenomenon preferentially occurred at the interface of α-phase and metastable β-phase.This set up a path for the selective attack to follow β-phase matrix and eventually penetrated the tube.The α-phase showed a minor tendency to dealiminize.
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