Review of Pulse Plating; Electrodeposition of Metallic/Alloy Coatings. Includes an Experimental Study of Ni-Cu Multilayer Deposits.

摘要

All metals are actually artificial and unstable materials (except gold and copper, which exists as metals in nature). Often are metals, for reasons of cost, strength and the process manufactured without too much regard to the external appearance and the corrosion resistance. The surface characteristics are then treated in subsequent processes. The main reason with the surface treatment is to improve the appearance and to improve corrosion resistance, hardness, wear resistance and other surface properties. The surface layer has to be thin otherwise the characteristics of the sample are changed. The type of surface treatment is often a matter of cost, the environment it has to withstand and the appearance necessary. Coatings can be applied by several different techniques, for example, hot-dipping, metal spraying, deposition in vacuum (physical vapor deposition (PVD) and chemical vapor deposition (CVD)) and electroplating. The electrodeposition can offer a relatively cheap and a quite industrialized production method.