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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Na2SnO3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/(cm2•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。

Modern testing techniques such as TEM, SEM, EDAX, Tafel curves, E-T curves and hydrogen collection test have been applied to analyze the effect of rolling temperature on the microstructure, electrochemical and anti-corrosion properties of Al-Mg-Sn-Bi-Ga-In alloy anode in alkaline solution (80℃, Na2SnO3+5 mol/L NaOH). The results show that when controlling the pass deformation at 40\%, with the increase of rolling temperature, the microstructure of Al alloy anode undergoes a process from disordered dislocations cell structure, subgrain structure to dynamic recrystallized structure. When the rolling temperature is 420℃, the Al alloy anode has the most negative electrode potential of about -1.48 V(vs•Hg/HgO) and the lowest hydrogen evolution rate of 0.1716 mL•cm-2•min-1 due to the uniform distribution of active elements and decrease of segregation phases in alloy. The optimum comprehensive performance of Al alloy anode has been obtained.

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