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为了改善AZ31镁合金在3.5wt%NaCl溶液中的抗腐蚀和活化性能,通过浸泡、电化学阻抗谱、恒电流和动电位极化扫描试验研究了偏钒酸铵及固溶退火处理对AZ31镁合金自腐蚀和电化学性能的影响。结果表明:偏钒酸铵能抑制AZ31镁合金的腐蚀,当0.5%偏钒酸铵加入到3.5wt%NaCl溶液时,合金的缓蚀率高(65.7%),自腐蚀电流小,为0.0033 mA/cm2。在-1.0 V下合金的电流密度高达30.0 mA/cm2,开路电位Eocp和活化电位Eact分别为-1.60 V和-1.35V。AZ31镁合金经350℃固溶4、8、16和24h,与铸态合金相比,其放电电位和耐蚀性有所降低。可是,随固溶时间延长,合金元素固溶度增大,结果导致合金放电性能和耐蚀性能提高。
In order to improve the anti-corrosion and activation properties of AZ31 magnesium alloy in 3.5wt% NaCl solution, the effects of ammonium metavanadate and solution annealing on the growth of AZ31 magnesium were studied by immersion, electrochemical impedance spectroscopy, galvanostatic and potentiodynamic polarization scanning experiments. Alloy corrosion and electrochemical properties of the impact. The results showed that ammonium metavanadate could inhibit the corrosion of AZ31 magnesium alloy. When 0.5% ammonium metavanadate was added to 3.5wt% NaCl solution, the corrosion inhibition rate of the alloy was high (65.7%) and the self-corrosion current was 0.0033 mA / cm2. The current density of the alloy at -1.0 V is as high as 30.0 mA / cm2, and the open circuit potential Eocp and the activation potential Eact are -1.60 V and -1.35 V, respectively. AZ31 magnesium alloy solid solution at 350 ℃ 4,8,16 and 24h, compared with cast alloy, the discharge potential and corrosion resistance decreased. However, as the solution time increases, the solid solubility of alloying elements increases, resulting in improved discharge performance and corrosion resistance of the alloy.