【摘要】 为了提高镁合金在腐蚀环境中的耐蚀能力，文中研究了两种无机型缓蚀剂偏钒酸钠（NaVO₃）与磷酸钠（Na₃PO₄）对镁合金AZ91D的缓蚀效果及机理，分析了在质量分数w（NaCl）=3.5%溶液中添加浓度为3 g·L^-1两种缓蚀剂对镁合金AZ91D表面成膜微观组织的影响，并通过浸泡失重实验及电化学测试对其缓蚀行为及机理进行研究。实验结果表明：两种缓蚀剂对镁合金AZ91D均有很好的缓蚀效果，在加入两种缓蚀剂的NaCl溶液中浸泡24 h后自腐蚀电位(E_corr)正移，腐蚀电流密度(I_corr)下降，交流阻抗提升2～3倍，NaVO₃表现出更为优异的缓蚀效果，浸泡失重所得平均腐蚀速率下降约80%。更多还原

【Abstract】 In order to improve the corrosion resistance of Mg alloys in corrosive environment, the paper deals with the corrosion inhibition effect and mechanism of two inorganic inhibitors-sodium metavanadate（NaVO₃） and sodium phosphate（Na₃PO₄）-on AZ91 D magnesium alloy.The effects were analyzed of the two corrosion inhibitors at a concentration of 3 g·L^-1 added in the solution with the mass fraction w（NaCl）=3.5% on the microstructure of the film formed on the surface of AZ91 D Mg alloy.Their corrosion inhibition behavior and mechanism were investigated by immersion weight loss experiment and electrochemical test.The results show that both corrosion inhibitors have excellent corrosion inhibition effect on AZ91 D magnesium alloy.After the alloy was immersed in the NaCl solution with the two corrosion inhibitors for 24 h, the self corrosion potential(E_corr) shifted positively, the corrosion current density(I_corr) decreased, and the AC impedance rose by 2～3 times.NaVO₃ exhibited better corrosion inhibition effect, and the average corrosion rate decreased by 80% after immersion.更多还原