发现一些管状铝合金通过机械变形弯曲成U形时更容易在弯曲表面发生腐蚀。建立了管状铝合金的水平和弯曲表面的显微组织与腐蚀的关系。通过对含0.08%及0.22%Mn的两种铝合金弯管弯曲部分的显微组织的观察,及在酸性盐水(SWAAT)中的腐蚀形貌及微观电化学反应的研究,发现高Mn铝管在弯曲表面较易发生点蚀,有较低的击穿电压及较高的阴极电流密度。SEM及TEM观察发现此现象的产生与高Mn铝管弯曲处弥散的粒径小于100nm的富含Mn的合金二次相有关。 It was found that some of the tubular aluminum alloys were more prone to corrosion on curved surfaces when they were bent into a U-shape by mechanical deformation. The relationship between the microstructure and corrosion of the horizontal and curved surfaces of the tubular aluminum alloy was established. By observing the microstructure of the bent parts of two kinds of aluminum alloy with 0.08% and 0.22% Mn and the corrosion morphology and the micro-electrochemical reaction in the acidic brine (SWAAT), it was found that the high Mn aluminum tube Pitting is more likely to occur on curved surfaces with lower breakdown voltage and higher cathode current density. SEM and TEM observations found that the occurrence of this phenomenon was related to the Mn-rich secondary phase of Mn alloy dispersed in the bend of high-Mn aluminum tube.