Paper contains some aspects regarding soil resistivity around underground gas pipelines. The main factors that affect pipelines durability, resulted in this work are shown.

Paper contains some aspects regarding the corrosion behavior of stainless steel type AISI 316L in hair shampoo medium. The electrochemical parameters by potentiodynamic methods at different temperatures and also corrosion rate by gravimetric methods for stainless steel type 316L with passive layer and without passive stratum were established. The medium and temperature influence above corrosion rate are shown in the work

Austenitic stainless steels tribological behavior could be improved by thermal treatments. Gases nitriding and plasma nitriding treatments applied on AISI 316 and AISI 304 reduce friction coefficients and wear. The aim of the work was to confirm the advantage of plasma nitriding treatment in rising friction couples durability made of austenitic stainless steels.

Sliding bearings in three cone bits are lubricated in heavy conditions. To improve tribological behavior, samples of bearings materials were made with implants of antifriction materials with different rapport between implant and free base material in the presence of different greases. Antifriction material has a greater dilatation coefficient than base material. If the implant dimension is too small, the solid lubricant capability to cover the base

Zr/ZrCN multilayers, with bilayer periods ranging from 4.4 to 70 nm, were deposited on C45 and M2 steels and Si substrates by the cathodic arc technique, in a CH4 +N2 atmosphere. The elemental and phase composition, modulation periodicity, texture, surface morphology, residual stress, hardness, adhesion, friction and wear behavior were investigated as a function of bilayer period and C/N ratio using AES, RBS, XRR, XRD and AFM techniques, surface