Corrosion Behavior of Low Carbon Steel Exposed to Different Soils

Abstract:

In this work the corrosion process of X52 pipeline steel in three different Mexican soils was studied. Sandy, clay and marshy soils were studied in function of moisture content. The results were related to the different stages (dry and rainy) that underground pipelines suffer during the season of the year. The electrochemical evaluations were carried out at different periods of time. The soils evaluated have different water retention and each soil has a moisture value in which the corrosion process is more active. However, this value for the marshy soil only belongs to the maximum value of moisture. The analysis of results, suggested that the corrosion phenomenon is different for each soil. The electrochemical results shown that, there was a moisture value on each type of soil that it accelerates the corrosion phenomenon. So, there is moisture content where the corrosion rate is maximum (12.7, 31.4 and 53.1 wt% H₂O, for the sandy, clay and marshy soils, respectively), obtaining values of 0.256, 0.294 and 0.383 mm/year. Furthermore, this paper propose the use of the electrochemical techniques as a complementary tool for the analysis of the cathodic protection in underground pipelines at different stages of season of the year, due to the voltage variations in different types of soils and different moisture content.

• Periodical: Materials Science Forum (Volume 793)
• Pages: 169-179
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.793.169
• Online since: May 2014
• Authors: Luis M. Quej-Aké*, J. Marín-Cruz, Ricardo Galván-Martínez, Antonio Contreras-Cuevas
• Keywords: Corrosion, Electrochemical Impedance Spectroscopy (EIS), Moisture, Pipeline, Soil

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