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The surface engineering, as interdisciplinary technical science is a relative new concept which appeared in high developed countries as a result of the processing of the metallic materials with distinct properties and as a result of spectacular development of the thermal treatments. The obtaining of the thin layers by electric spark presents some advantages as: high adherence of the layers, permits deposition of all materials which have electrical conductivity, but there are some disadvantages as: residual stress in layer and large roughness.