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用失重法、收集氢气、电子探针合金成分分析和腐蚀形貌观察等方法,研究了AZ63和AZ41镁合金及纯镁在水中的析氢行为.结果表明:在淡水中镁阳极处于活性溶解状态;淡水中镁阳极上的析氢速度与电流密度呈线性关系,这与在0.5MOL/LNACL+MG(OH)2(PH＝10.2)溶液中的情况类似,但负差异效应常数小于纯镁在0.5MOL/LNACL+MG(OH)2溶液中的数值;析氢不是镁阳极电流效率不高的唯一原因,阳极溶解过程中发生颗粒状脱落是其中的又一原因.“,”Hydrogen evolution on three sacrifical magnesium anodes AZ63, AZ41 and pure magnesium in freshwater has been studied by means of weight loss, hydrogen collection, electron probe analysis and morpho-logical observation. The results show that all the three magnesium anodes in fresh water are in active stateand the velocity of hydrogen evolution is linearly dependent on current density Their negative differentialeffect coefficients in fresh water are less than that for magnesium in 0.5mol/L NaCl+Mg(OH)2(pH10.2)solution. Hence the hydrogen evolution is not the only reason for the low current efficiency of magnesiumanodes. The fall of magnesium grains may be the another important canse.