Influence of Chemical Properties of Soil on the Corrosion Morphology of Carbon Steel Pipes

Abstract

Corrosive soils are responsible for the deterioration of buried underground utilities such as buried steel pipes. Frequent pipe failures are reported due to corrosive soil globally. Although soil's corrosion phenomenon has been understood and identified long time ago, pipe failures due to corrosive soil are uncontrollable and unavoidable despite the use of protective coatings and techniques such as cathodic protection. Therefore, it is essential to review the causes of soil's corrosivity for the protection of steel pipes. This chapter demonstrates the influence of varying moisture and chloride contents of soils on the corrosion of coated and uncoated steel pipes. Carbon steel specimens (coated and uncoated) were buried in soils of 20, 40, 60, and 80 wt.% moisture content, respectively, while the chloride concentration introduced in soil was 0, 5, and 10 wt.%, respectively. Through the analysis of experiments, it is revealed that the corrosion rate of pipes buried in soil increases with increase in moisture content up to critical moisture and chloride values. The influence of soil's moisture and chloride on the corrosion products formed on steel pipes was investigated and comprehensively explained in this chapter. Authors believe that the knowledge presented in this chapter can be applied to other structures or utilities buried in corrosive soils.

Evaluation of the Influence of the Combination of pH, Chloride, and Sulfate on the Corrosion Behavior of Pipeline Steel in Soil Using Response Surface Methodology

“…Meanwhile, from the minimum value of chloride concentration to the maximum value of sulfate concentration, the corrosion current density increased from 4.2 to more than 9 , which indicates quite a large influence. Several other studies have investigated this behavior and agree with these results [ 31 , 32 , 33 ].…”

Relationship Between Soil Engineering Properties and Corrosion Rate in Andesitic Volcanic Soils, West Lampung, Sumatra, Indonesia

“…Marusic et al (2018) stated that corrosion in soils resembles atmospheric corrosion with corrosion rates usually higher and depending on the soil type [22]. In the next research, Wasim and Shoaib (2019) revealed that varying moisture and chloride contents can cause corrosion problems [35]. Accordingly, Liu et al (2019) argue that the corrosion is accelerated with the increasing soil thickness due to more water contained in the soil [20].…”

Tropical Volcanic Residual Soil

“…Another thing that is concerned about is the corrosion process of steel. Veleva et al [84]; Norhazilan et al [85]; Noor and Al-Moubaraki [86]; Lim et al [87]; Wasim and Shoaib [88]; Liu et al [89] revealed that soil composed of silt and clay will have the highest level of corrosion compared to soil composed of rough grains (gravel to sand), this is related to the water content, the corrosion process will be high in soils with high water content. Iqbal et al [29] stated that the properties of soil engineering (plasticity index, water content, and clay content) impact the corrosion process of steel.…”