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采用透射电镜、扫描电镜、能谱分析、Tafel曲线、计时-电位法(E-T曲线)和析氢测量等现代分析测试方法研究了不同轧制温度的Al-Mg-Sn-Bi-Ga-In铝合金阳极的显微组织变化及其在80℃,添加Na_2SnO_3缓蚀剂的5 mol/L NaOH电解液中的电化学性能和耐腐蚀性能。结果表明:当控制道次变形量为40%时,随着轧制温度的升高,铝合金阳极的显微组织经历了从位错胞状组织、亚晶组织到动态再结晶组织的转变过程。在轧制温度为420℃进行轧制时,合金中Sn和In等活性元素分布均匀,偏析相减少,铝合金阳极电极电位负移至-1.48V(vs·Hg/HgO)左右,析氢腐蚀速率也降为0.1716 mL/(cm~2·min),说明该轧制工艺条件下,铝合金阳极电化学综合性能较好。
The Al-Mg-Sn-Bi-Ga-In aluminum alloys with different rolling temperatures were investigated by using modern analytical methods such as transmission electron microscopy, scanning electron microscopy, energy dispersive spectroscopy, Tafel curve, time-potential curve (ET curve) The change of the microstructure of the anode and its electrochemical performance and corrosion resistance in a 5 mol / L NaOH electrolyte with addition of Na_2SnO_3 inhibitor at 80 ℃. The results show that the microstructure of anodic aluminum alloy undergoes the transition from dislocation cellular structure to subgrain microstructure to dynamic recrystallization microstructure with the increase of rolling temperature when the control pass deformation is 40%. When the rolling temperature is 420 ℃, the active elements such as Sn and In in the alloy are uniformly distributed and the segregation phase decreases. The potential of the anode of the aluminum alloy is negative shifted to -1.48V (vs · Hg / HgO), and the hydrogen evolution rate Also reduced to 0.1716 mL / (cm ~ 2 · min), indicating that under the conditions of the rolling process, the electrochemical performance of aluminum alloy anode is better.