Effect of microstructure on corrosion resistance of pipelines steels buried in alkaline soil

In this work, we tried to examine the effect of microstructure of low carbon pipeline steels on their behaviour to corrosion when they are buried in alkaline soil. In this environment, the corrosion rate of these steels depends on a number of different parameters. Perhaps the most significant of these parameters, namely, is the formation, evolution and nature of the corrosion products, which are deposited on the metal surface. The laboratory experiments realised from electrochemical measurements and characterisation of corrosion products have shown that the microstructure influences the properties of the corrosion layers, such as morphology, proportion of the various chemical compounds, adherence of the film and the protective properties. The results obtained are striking, not only there was a difference in certain properties of corrosion layers, but also protective power is strongly affected.