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利用磁控溅射技术制备了晶粒尺寸为300nm～400 nm的GW102K(Mg-10Gd-2Y-0.5Zr)微晶薄膜.通过动电位极化曲线和电化学阻抗谱(EIS)研究微晶薄膜在0.2 mol/L Na_2SO_4水溶液中的腐蚀行为.极化曲线结果表明,微晶化加速GW102K靶材合金的阴极过程,而抑制其阳极过程.EIS结果表明,微晶化降低GW102K靶材合金在自腐蚀电位下的转移电阻和腐蚀产物膜电阻,从而降低其耐蚀性.微晶化提供大量的晶粒边界,氢原子通过晶粒边界快速扩散,生成氢化物,从而加速GW102K靶材合金的阴极反应速率.此外,微晶化促进金属的阳极溶解,使微晶薄膜表面形成大量均匀的腐蚀产物,从而抑制金属的进一步溶解.
The GW102K (Mg-10Gd-2Y-0.5Zr) microcrystalline thin films with grain size of 300nm ~ 400nm were prepared by magnetron sputtering.The microcrystalline films were characterized by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) In 0.2 mol / L Na_2SO_4 aqueous solution.The results of polarization curves show that microcrystallization accelerates the cathode process of GW102K target alloy and inhibits the anodic process.EIS results show that the microcrystallization reduces the GW102K target alloy in the self Corrosion potential corrosion resistance and corrosion resistance of the film, thereby reducing the corrosion resistance.Microcrystallization to provide a large number of grain boundaries, hydrogen atoms through the grain boundary rapid diffusion to generate hydride, thereby accelerating the cathode of the GW102K target alloy In addition, microcrystallization promotes the dissolution of the metal anode, the surface of the microcrystalline thin film to form a large number of uniform corrosion products, thereby inhibiting the further dissolution of the metal.