ABSTRACT

The effect of different surface treatments on the corrosion resistance of the AA2098 Al–Cu–Li alloy has been investigated. Surface characterization was performed using 3D optical profilometry, energy dispersive X-ray spectroscopy and scanning electron microscopy. The corrosion resistance of the 2098 alloy after the surface treatments was investigated in 0.1 mol L⁻¹ NaCl solution by electrochemical techniques and microscopy. Corrosion results showed that the untreated and the chemically etched surfaces were more active than the mechanically abraded and mechanically polished surfaces owing to differences in the nature of the native oxides formed after the surface treatments. Corrosion rate and mode were also affected by how close the exposed surface was to the mid-thickness region of the AA2098-T351 plate relative to the actual top surface (before polishing). This is associated with the variation in the volume fraction and distribution of the T1 phase as the mid-thickness region of the AA2098-T351 plate is approached.

摘要

研究了不同表面处理对 AA2098 Al-Cu-Li 合金耐腐蚀性能的影响。使用 3D 光学轮廓测量法、能量色散 X 射线光谱法和扫描电子显微镜进行表面表征。2098合金表面处理后的耐腐蚀性能在0.1 mol L ^{-1中进行了研究}通过电化学技术和显微镜观察 NaCl 溶液。腐蚀结果表明，由于表面处理后形成的天然氧化物的性质不同，未经处理和化学蚀刻的表面比机械研磨和机械抛光的表面更活跃。腐蚀速率和模式还受暴露表面与 AA2098-T351 板的中间厚度区域相对于实际顶面（抛光前）的接近程度的影响。这与接近 AA2098-T351 板的中间厚度区域时 T1 相的体积分数和分布的变化有关。