Elucidating different selective corrosion behavior of two typical marine aluminum bronze alloys from the perspective of constituent phases

The selective corrosion behavior of two typical marine aluminum bronze alloys (i.e., NAB and MAB) were investigated comparatively. The characteristics of each constituent phase in NAB and MAB including composition, morphology, distribution and work function were analyzed, and their roles in the micro-corrosion behavior were elucidated. MAB exhibits de-alloying corrosion, whereas NAB shows localized selective phase corrosion. The crucial factor causing different selective corrosion behavior is the morphology and distribution of constituent phases. The results reveal correlations between selective corrosion behavior and microstructure and provide insights into improving corrosion resistance of aluminum bronze alloys on the concept of microstructure tailoring.