采用电化学方法研究了预充氢对690合金在25,50,70 C下弱碱性溶液中电化学行为的影响.结果表明,预充氢使得690合金在碳酸氢钠溶液中的自腐蚀电位负移、电化学阻抗降低,尽管不影响阳极极化曲线的形状,但增大了阳极极化曲线中一次过钝化电位之前的阳极电流密度.此外,预充氢使镍在碳酸氢钠溶液中的阳极极化曲线出现新的阳极电流峰,增大了阳极极化曲线中过钝化电位之前的电流密度,并降低了电化学阻抗.氢对金属或合金电化学行为的作用与电极反应类型、速率控制步骤以及表面膜的稳定性有关.
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