【摘要】 分析了极化时镁合金表面腐蚀电偶对阳极行为.极化使镁合金腐蚀电对阴极(Mg17Al12)相阳极化是镁合金产生负差数效应的原因.阳极化结果是原阴极β(Mg17Al12)相表面Mg发生溶解,增高了β相表面Al含量,提高了β相的腐蚀电位;上述两种作用增大了Mg的溶出量,导致负差数效应.更多还原

【Abstract】 By analyzing the corrosion behaviour anode in galvanic couple of the magnesium in the state of polarization,a conclusion is drawn that the NDE of magnesium alloys is caused by the anodized cathode(β phase) in galvanic couple during polarization.Polarization leads to a rise of magnesium dissolution on the surface of β phase which increases both the corrosion potential of cathode(β phase) and the Al concentration,resulting in the increase of magnesium dissolution which conduces the NDE of magnesium alloys.更多还原