Abstract
Abstract Ammonium nitrate fertilizer, distributed at concentrations of up to 0.1 w/o through irrigation systems, is a source of corrosion to structures, piping, valves, and electrical components. Corrosion behavior of synthetic mixtures and ground water samples was studied by potentiodynamic and linear polarization methods. Anodic profiles for low carbon steel in dilute mixtures of NH4NO3 and water are nonlinear and therefore not adaptable to direct Tafel analysis. Linear polarization correlates well with weight change and initial corrosion rates were found to vary between 12 to 20 mpy, depending upon NH4NO3 concentration. A combination of linear polarization and potentiodynamic scanning was used effectively to characterize corrosion in ground waters.
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