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镁合金表面预处理对电沉积锌镀层界面形成与镀层生长的影响

, PP. 307-311

Keywords: 镁合金,电镀锌,计时电流法,形核

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Abstract:

采用SEM、EDXS、XPS及电化学测试方法对镁合金表面镀锌电沉积过程中的界面反应及镀层生长规律进行研究.结果表明,采用前处理方法后,镁合金表面膜的成分由Mg(OH)2/Mg(OH)HCO3转变为MgF2+Zn,有效地抑制了镁在电镀液中的腐蚀,促进了锌在电极表面的形核与生长,获得的锌镀层与基体结合力优良.采用计时电流法对锌镀层电结晶的研究发现低过电位下电极表面经历了两次形核过程,镀层沉积物颗粒显得致密,而高过电位下电极表面只经历了一次形核过程,镀层沉积物颗粒变得松散.

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