A metal/liquid interface corrosion-reaction model is developed for the flow electrification of low-conductivity liquids in metal pipes. In the proposed model, impurity anions participate in a corrosion reaction at the wall, leaving a net positive ion concentration in the diffuse electrical double layer. Convection of this positive charge constitutes the streaming current. Theoretical calculations for the convected space charge density demonstrate a velocity-dependent entrance effect that diminishes in pipes of larger radii, in agreement with experimental data for heptane in stainless steel pipes. Far downstream, the proposed model also correctly predicts that the convected space charge density falls with increasing pipe radius. As in previous work, the convected space charge density far downstream, (I/Qecb)∞, is found to be linear with the ζ-potential. However, the proposed model is self-consistent in that the ζ-potential arises as part of the calculation and is not an adjustable constant characteristic only of the metal/hydrocarbon interface. In the entrance region, the convected space charge density is assumed to vary exponentially with axial position with the form (I/Qecb) = (I/Qecb)∞ − A(I/Qecb)1 × exp(−ας), where A is a preexponential factor, (I/Qecb)1 is a deviation function, α is a characteristic eigenvalue, and ς is the dimensionless axial coordinate. With a known value of 79.8 μm for the solution Debye length, calculations show A to be 0.075, and (I/Qecb)1 and α to be 7.98 (10-4), 1.42 (10-4), and 2.60 (10-5) and 1.242, 2.425, and 2.938, respectively, for pipe radii of 0.24, 0.58, and 1.25 mm, respectively.