【摘要】 为解决可穿戴设备中镍镀层受到汗液腐蚀而产生镍释放的问题,提出以Al–Mn合金镀层替代镍镀层。采用扫描电镜(SEM)和能谱仪(EDS)分析了Al–Mn合金镀层的微观形貌、成分,测试了它的表面粗糙度、光泽和努氏硬度,通过静态浸泡腐蚀试验和动电位极化曲线测量研究了Al–Mn合金镀层在人工汗液中的耐蚀性。结果表明:电沉积所得Al–Mn合金镀层镜面光亮、平整、致密,与基体结合良好,努氏硬度高于光亮镍镀层。Al–Mn合金镀层在人工汗液中发生全面的均匀腐蚀,耐蚀性为2级。Al–Mn合金镀层在人工汗液中的腐蚀电流密度与光亮镍镀层相近,但腐蚀电位更负,对腐蚀电位较负的基体起牺牲阳极保护作用,可以替代镍镀层用于汗液腐蚀的环境中。更多还原

【Abstract】 In order to deal with the nickel release problem on the surface of smart wearable devices caused by nickel corrosion in artificial sweat, Al–Mn alloy coating was recommended to replace nickel coating. The micromorphology and composition of Al–Mn alloy coating were analyzed using scanning electron microscope(SEM) and energy-dispersive spectrometer(EDS), its roughness, glossiness, and Knoop hardness were tested, and its corrosion resistance in artificial sweat was studied by static immersion testing and potentiodynamic polarization measurement. The results showed that the electroplated Al–Mn alloy coating was mirror-bright, smooth, and compact with strong adhesion to substrate and had a Knoop hardness higher than that of bright nickel coating. Al–Mn alloy coating suffered a uniform general corrosion in artificial sweat with a two-level corrosion resistance. The corrosion current density of Al–Mn alloy coating in artificial sweat was similar to that of bright nickel coating, but its corrosion potential was more negative. Al–Mn alloy coating has a protective effect on the substrates with relatively negative corrosion potentials as a sacrificial anode, and it is an alternative to nickel coating in corrosive sweat environments.更多还原