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研究钨酸钠对AZ61镁合金在3.5%NaC l腐蚀介质中的缓蚀作用.电化学阻抗谱(EIS)、Tafel极化曲线、扫描电子显微镜(SEM)等测试表明,钨酸钠缓蚀剂可有效抑制镁合金在NaC l介质中的腐蚀,当钨酸钠浓度为0.01 mol.L-1可达到较好的缓蚀效果,缓蚀效率达75.5%.钨酸钠可参与镁合金表面膜的形成,使表面膜更致密,从而抑制镁合金的腐蚀;其缓蚀作用属于阳极抑制型缓蚀机理.
The corrosion inhibition effect of sodium tungstate on AZ61 magnesium alloy in 3.5% NaC l corrosive medium was studied.The electrochemical impedance spectroscopy (EIS), Tafel polarization curve and scanning electron microscope (SEM) showed that sodium tungstate corrosion inhibitor Can effectively inhibit the corrosion of magnesium alloy in NaC l medium, when sodium tungstate concentration of 0.01 mol.L-1 can achieve better corrosion inhibition, corrosion inhibition efficiency of 75.5%. Sodium tungstate can participate in the magnesium alloy surface film The formation of the surface film more dense, thereby inhibiting the corrosion of magnesium alloy; its inhibition is anodic inhibition inhibition mechanism.