Abstract Hydrogen evolution and dissolution of Aluminium (Al) have been investigated at different anodic potentials in de-oxygenated 3.5 % NaCl electrolyte to afford new insights into its negative difference effect (NDE). Innovatory to previous reports, the instantaneous concentration of dissolved Al3+ ions was detected using a novel in-situ electrochemical ICP-OES technique and a dissolution stoichiometry of n = 3 was observed, thereby precluding the Al intermediate ion mechanism. The effects of the local pH and the surface film’s breakdown area on the hydrogen evolution rate were investigated quantitatively, which suggests that the NDE of Al results from the combined effects of these two factors.

中文翻译：

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使用原位电化学 ICP-OES 对铝腐蚀负差异效应的新见解

摘要 在脱氧的 3.5% NaCl 电解液中，研究了不同阳极电位下铝 (Al) 的析氢和溶解，以提供对其负差效应 (NDE) 的新见解。与之前的报道相比，采用新型原位电化学 ICP-OES 技术检测溶解的 Al3+ 离子的瞬时浓度，并观察到 ​​n = 3 的溶解化学计量，从而排除了 Al 中间离子机制。定量研究了局部 pH 值和表面膜的击穿面积对析氢速率的影响，这表明 Al 的 NDE 是这两个因素的综合作用的结果。