低温熔融盐电镀铝的研究

Low Temperature Electroplating Aluminum in Molten Salt

低温熔融盐电镀我国发展较晚,在低碳钢上开展得更迟。为此,采用熔融盐电镀法对Q235钢在AlCl_3-NaCl-KCl熔融盐中电镀铝的可能性以及电镀工艺对电镀铝层组织形态的影响进行了研究。结果表明,Q235钢在熔融盐中可以进行电镀铝。经X射线衍射分析表明,镀层的相结构为单相铝。镀层的厚度随电流密度的增大和电镀时间的延长而增加,与电镀时间的平方根成线性关系。镀铝层由许多分布均匀的铝颗粒组成,电流密度低时,铝颗粒呈片状;电流密度高时,铝颗粒呈球状。同时,对电镀铝层的形成机理也进行了初步探讨。

Development of low temperature molten salt electroplating technology is quite later in China, especially for mild steel. Therefore the possibility of aluminum electroplating on Q235 steel in AlCl_3 - NaCl-KCl molten salt and the effect of electroplating process parameters on structure and morphology of plating were studied. Results show that aluminum electroplating on Q235 steel is obtained from the molten salt. The structure of plating is a single-phase aluminum by means of XRD analysis. The thickness of plating increases with the increase of current density and electroplating time, and is linear with t^(1/2). The plating is composed of a number of aluminum grains. At low current density, the appearance of aluminum grains was flake-like; and at higher current density, the appearance of aluminum grains is spheroid-like. Moreover, The reaction mechanism was presented preliminarily.