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Study of the effect of fluid flow on corrosion rate for simple carbon steel in aqueous solution using rotating disk electrode

Bastani, D ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: 2008
  3. Abstract:
  4. The influence of fluid flow on the corrosion of simple carbon steel ST37 (AISI 1020) in aqueous solution of Bandar-Abbas gas well was studied at 25°C under air-saturated condition. The mechanism and kinetic of corrosion in different hydrodynamic conditions were determined using a rotating disk electrode. Increasing the velocity of rotating disk ≤ 1000 rpm caused an augmentation in corrosion rate from 9.89 to 18.95 mill in./yr. Increasing the velocity beyond 1000 rpm changed the corrosion mechanism so that the activation polarization will control the corrosion process, and the variation in corrosion rates was due to various corrosion mechanisms rather than mass transfer of reactant component. At low velocities, corrosion rate was controlled completely or partially by mass transfer, while with increasing velocity, the concentration of corrosive components, e.g., oxygen increased on the sample surface and the corrosion product concentration decreased. At > 1000 rpm velocity, mass transfer rate increased and reduction reaction was controlled by activation polarization. Here, kinetic barrier would act as a cathodic reaction so that with increasing rotational velocity, the change in corrosion rate is negligible. This is an abstract of a paper presented at the 18th International Congress of Chemical and Process Engineering (Prague, Czech Republic 8/24-28/2008)
  5. Keywords:
  6. Fluid flow ; Carbon steel ; Carbon steel ST37 (AISI 1020) ; Rotating disk electrode ; Mass transfer coefficient ; Corrosion
  7. Source: 18th International Congress of Chemical and Process Engineering, CHISA 2008, Prague, 24 August 2008 through 28 August 2008 ; 2008