The work is framed in the research category connected with, the improvement et bearing of some couple from the industry of machine construction by applying of some methods of modifying of the quality of superficial layer. This domain allows the use of some materials for constructing mechanical devices (parts) without having in their whole special properties being obtained from those spheares which have an important functional role. Some theoretical contributions are given for optimize the process of plating connected with the use of techniques of data – data mining which could be used to extract valuable information and knowledge from massive volume of data, so that the optimal parameters con be used in applying a process of plating from metallic pulverize through electro erosion.