熔盐膜电解渗涂采用微型电解池,有利于克服熔盐浴电解渗涂的某些缺点。熔盐膜盐铝有三种类型:阳极不可溶;阳极可以提供铝;无电解渗铝。熔盐中的歧化反应3AlCl AlCl_3+2Al实际上是电极反应的后置转换反应,在渗涂过程中起提供铝原子的作用。 熔盐膜是一种由液、固两组成的分散体系,对流受到限制,传质仅依靠扩散和电迁移。电解过程受浓差控制,电极易极化,有利于多元共渗。已实现Al～Cr、Al-Si、Al-Mn、Al-Ce、Al-Y共渗。
The modified metalliding cell from molten salt film consists of three parts namely, cathode, anode and salt film. The sample is cathode, the graphite powder or metal powder is anode, and the salt film is composed of Al_2O_3 powder, salt and an inorganic adhesion agent. They are all fixed in a stainless steel container. Metal!iding was then processed in a furnace. In this way the electrolytic cell can he made smaller, so that some disadvantageous aspects of ordinary metalliding from fused salt bath can be overcome. There are three types of aluminium impregation by the present technique: (a)the anode is not soluble, (b)the anode can supply aluminium, (e)electroless. The disproportionatio reaction: 3AlCl AlCl_3+2Al went after the electrode reaction supplies aluminium atoms. The film is a dispersal system composed of solid and liquid phases. The mass transport in the film depends on diffusion and ionic mobility. Cathodi polarization makes codeposition easier. Coatings of Al, Al-Cr, Al-Si, Al-Mn, Al-Ce and Al-Y have been attainedby this method.
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