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研究Al-Me(Me:Mg,Zn,Bi,Sn,Pb,In,Ga)二元合金在25℃ 4 mol/L NaOH碱性介质中的析氢腐蚀速率、自腐蚀电位、恒电流极化电极电位.结果表明:在25℃ 4 mol/L NaOH碱性介质中,纯铝中加入Zn或In的Al-Me二元合金析氢腐蚀速率增大,自腐蚀电位负移;加入Bi或Ga的Al-Me二元合金析氢速率影响不大,自腐蚀电位负移;添加Mg,Sn或Pb的Al-Me二元合金析氢速率降低,自腐蚀电位正移.当以100 mA/cm2的电流密度进行恒电流极化时,Mg,Zn,Bi,In能使Al-Me二元合金电极电位稍有负移,Sn,Pb,Ga能使Al-Me二元合金电极电位大幅度负移.
The hydrogen evolution rate, self-corrosion potential, galvanostatic electrode of Al-Me (Me: Mg, Zn, Bi, Sn, Pb, In, Ga) binary alloy in alkaline solution of 4 mol / L NaOH at 25 ℃ were studied. The results showed that the hydrogen evolution rate and the self-corrosion potential of Al-Me binary alloys with addition of Zn or In in pure aluminum increased with the addition of Al or Bi and Al in the alkaline medium of 4 mol / L NaOH at 25 ℃. -Me binary alloy has little effect on the hydrogen evolution rate, and the self-corrosion potential shifts negatively; the hydrogen evolution rate of Al-Me binary alloy with addition of Mg, Sn or Pb decreases and the self-corrosion potential moves forward.When the current density is 100 mA / cm2 In galvanostatic polarization, the potential of Al-Me binary alloy electrode is slightly negative shifted by Mg, Zn, Bi and In, while the potential of Al-Me binary alloy electrode is greatly negative shifted by Sn, Pb and Ga.