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在模拟填包料环境的硫酸钙-氢氧化镁饱和溶液中,在AZ41镁合金牺牲阳极直流放电的同时引入交流电干扰。试验发现,引入交流电干扰时采用不同形状的辅助电极,电场分布情况不同,放电试验后镁阳极形貌明显不同。镁阳极工作电位随着交流电干扰的增强而明显正移,有时甚至可能正于铁的开路电位,出现所谓的“极性逆转”现象。从硫酸钠+铁氰化钾+亚铁氰化钾溶液中测试的极化曲线来看,镁阳极上的腐蚀产物具有n-型半导体的导电特征。阳极电流效率随交流电流密度的逐步增大而明显下降。XRD分析表明,有交流电干扰时镁阳极腐蚀产物仍然只有Mg(OH)_2,这与单纯直流放电时的结果一样。
In simulated filling environment of calcium sulfate - magnesium hydroxide saturated solution, AZ41 magnesium alloy sacrificial anode DC discharge at the same time the introduction of AC interference. The test found that the use of different shape auxiliary electrodes when the AC interference is introduced, the electric field distribution is different, the morphology of the magnesium anode after the discharge test is obviously different. The working potential of magnesium anodes shifts significantly positively with the increase of AC interference, sometimes even at the open circuit potential of iron, so-called “polarity reversal” occurs. From the polarization curves of sodium sulfate + potassium ferricyanide + potassium ferrocyanide solution, the corrosion products on the magnesium anode have the n-type conductivity of the semiconductor. The anode current efficiency decreases with the gradual increase of AC current density. XRD analysis shows that there is still only Mg (OH) 2 in the corrosion products of magnesium anode with AC interference, which is the same as that of pure DC discharge.