Abstract
Water pipe corrosion inflicts big health problems and financial damages to societies. Temperature, pH, type, and dosage of oxidants, and DO are some of the key factors that affect water pipe corrosion. The aim of this research is to assess the impacts of temperature (15 and 25oC), dosage of potassium permanganate (0, 1 and 2 mg/L) and sodium hypochlorite (0, 0.5 and 1 mg/L) on corrosion of steel pipes. To measure the corrosion of steel specimens, OCP, EIS and potentiodynamic polarization tests were conducted. The results showed a direct relationship between temperature and corrosion rate. A 10-degree raise in the temperature, caused a 25% increase in corrosion current density (CCD). Adding sodium hypochlorite to the solution, decreases CCD by around 50%. Moreover, potassium permanganate proved to have a positive impact on reducing CCD by up to 21%. The results demonstrate that simultaneous usage of NaClO and KMnO4 for water disinfection can have beneficial impact on corrosion of steel pipes. Finally, our analysis suggests that when combined with KMnO4, lower dosage of NaClO significantly increases polarization resistance. The findings of this research highlight the impact of disinfectants on steel water pipes corrosion in different temperatures and supports water infrastructure decision-makers in more effective rehabilitation and maintenance of water pipes. Further, our results inform decision-makers for a more effective infrastructure design and resilience planning to random failures caused by corrosion.
Highlights
Water is a critical infrastructure and the quality of water is key for the well-being of the society (Forde et al, 2019)
Our analysis of the effect of NaClO on corrosion of ST52 steel specimen revealed that larger values of this substance results in more polarization resistance (Figure 3) and less negative potential (Figure 4)
A we observed a major decline in corrosion current density (4053%) and a significant rise in charge transfer resistance (Table 4)
Summary
Water is a critical infrastructure and the quality of water is key for the well-being of the society (Forde et al, 2019). Quick Response Code treatment plants face operational challenges, sustained provision of water may be interrupted. These challenges could be water treatment infrastructure aging, pipeline corrosion, poor monitoring, and maintenance issues that could jeopardize the well-being of consumers (Lee and Schwab, 2005; Ohwo, 2016). Corrosion of water treatment plants’ facilities and structures is a major concern for operators and managers This phenomenon endangers human health, causes colossal financial damages, lowers water quality, reduces carrying capacity of pipes and leads to a faster rate of structural failure (St. Clair and Sinha, 2012; Taghipour et al, 2012; Liu and Kleiner, 2013; Beimeng et al, 2015; Jin et al, 2017; Sakran, et al, 2019; Ighalo et al, 2020). Several factors contribute to corrosion of steel pipes including dissolved Oxygen (DO) (Wasim et al, 2018; Shams et al, 2019), pH (Tang et al, 2018; Abbasi et al, 2020), and hydrodynamic conditions of water (Madasamy et al, 2018; Liu et al, 2020)
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