Document Type : Original Article
wasit university, science college
Geology department, college of science, wasit university
Department of Chemistry, College of Science, Wasit University, Wasit , Iraq
Two methods of weight loss and polarization were studied, where the corrosion of buried underground pipes in clay soil and its effect on the thickness of the clay layer as well as introducing gases such as nitrogen, air and carbon dioxide to the soil were studied. The rate of corrosion of pipeline steel in soil with 6% CO2/N2 The thickness layer of soil affects the speed of corrosion, with a 4 mm layer soil thick representing the greatest rate.The soil layer's contradictory blocking and moisture-retaining capabilities impede steel corrosion. Because more water is trapped in shallow soil layers such as 4 and 6 mm, corrosion rises. The inhibitory effect of layer of soil on corrosive species diffusion becomes more prominent when layer of soil thickness is raised to 12 mm and 14 mm. As a result, the steel's corrosion rate is lowered. Steel degrades quickly in soil layers holding 6% CO2/N2. Weight-loss experiments and potentiodynamic polarization measurements show a relationship between corrosion rate and soil layer thickness. According to weight-loss studies, steel corrosion rates in soil with varying thicknesses and gassing conditions are generally less than 0.046 mm/y.