银币表面非晶氧化铝抗变色保护层

Anti-tarnishing Amorphous Alumina Films on Silver Coins

采用反应磁控溅射技术在银币表面沉积非晶氧化铝抗变色膜。采用掠入射X-射线衍射(GXRD)、X-射线光电子谱(XPS)和原子力显微镜(AFM)对薄膜结构和形貌进行了研究。沉积了氧化铝膜的银币在0.5 mol/L NaCl+10 mmol/L Na2S混合溶液中的自腐蚀电位升高,腐蚀电流密度降低。在H2S蒸汽环境中的加速实验结果表明,表面沉积了氧化铝膜的银币具有优异的抗变色性能。

Amorphous alumina films were deposited on silver coin surfaces by reactive magnetron sputtering to improve the anti-tarnishing property of silver.Glance angle X-ray diffraction（GXRD）,X-ray photoelectron spectoscopy（XPS） and atomic force microscopy（AFM） were used to analyze the chemical state and surface morphology of alumina films.The corrosion potential of silver coins covered with amorphous alumina was increased,and corrosion current density was decreased in 0.5 mol/L NaCl＋10 mmol/L Na2S mixing solution.The accelerated test in H2S vapor showed that the alumina film had excellent anti-tarnishing properties.