Corrosion of Steel Quantitative Effect of Dissolved Oxygen and carbon Dioxide

A comprehensive model for predicting CO2 corrosion rate in oil and gas production and transportation systems

“…Some believe that addition of CO 2 to air-saturated water depresses the rate of rusting of iron [73], or normal levels of CO 2 have no effect on the corrosion rate of steel in O 2 -saturated water [74], while some others believe that CO 2 can play an active role in the corrosion of steel [68,72,75]. This work can provide results to reconcile this conflict from a fundamental perspective.…”

“…Fig. 7 shows two sets of experimental data that are available allowing for the model validation [68,72]. The O 2 partial pressures are 0, 0.034, 0.068 and 0.2 atm.…”

“…In the calculation, an SF of 0.067 was used to obtain the best fit to all the experimental data from different sources. The information in the literature [68,72] is insufficient to determine the SF which otherwise could be used here. The predicted results fall well between the experimental data from the two references [68,72].…”

“…Comparison of model results with experimental data at 60 • C from two sources (solid symbols[68], open symbols[72]). The boundary layer thickness is 0.35 mm and SF = 0.067.…”

Flow-Assisted Corrosion in Coal Seam Gas Infrastructure

“…Thomas and Davies (Thomas & Davies, 1977) reported that bicarbonate ions reduces the passive -active (Flade) potential for ferric oxides, while increasing the passive-active transition potential for magnetite with increasing HCO 3 -concentration when the concentration is greater than 10 -2 M. However, some researchers argued that a stable-film formation (passivity) can be achieved when a sufficient amount of bicarbonate is present (Abdulrahman, Ismail, & Hussain, 2011;Lu, Huang, Huang, & Yang, 2006;Xue & Cheng, 2010 Yunovich, et al, 1998). Dissolved oxygen has been shown to increase corrosion rates (Abdallah, 2003;Finnegan & Corey, 1935;Gedge, 1993;Oldfield & Todd, 1979;Oldfield & Todd, 1999) Kuch (Kuch, 1988) reported that in the absence of oxygen, it is possible for ferric scale −FeOOH (lepidocrosite) previously formed on the metal surface to act as an electron acceptor:…”