Protection Current Density Required to Protect an AISI 1018 Carbon Steel Elbow in Saturated Potash Brines at Various Flow Velocities and Slurry Concentrations of 1.05 mm Diameter Sand using a Vertical Flow Loop Apparatus

Published: 1 February 2020| Version 3 | DOI: 10.17632/gkwrx7tz2k.3
Michael Trask


This data shows the averaged protection current density required to protect AISI 1018 carbon steel elbows in saturated potash brine at flow velocities 2.5, 3.0, 3.5, and 4.0 m/s from 0 to 35 wt.% sand concentration using 1.05 mm sand. This data shows how the current density required to protect the steel behaves when flow velocity and slurry concentration are changed. It is interesting to note how the current density increases with slurry concentration up to a maximum point, and then decreases with the further addition of sand. The data also displays the affect of flow velocity on the protection current density. When the results are plotted as flow velocity versus protection current density at a constant slurry concentration, one can find the relationship to be linear at all slurry concentrations tested.


Steps to reproduce

In these experiments, a carbon steel elbow was cathodically protected on a vertical flow loop apparatus and the current density required to protect the steel under various sand loading and flow velocity conditions was measured. The flow loop was filled with fully saturated potash brine using 1.05 mm diameter sand particles as the second phase abrasive. The flow loop was set to a flow velocity and measurements of current density to protect the steel were taken while adding sand in 1 wt.% concentration increments. Experiments were done successively from 0 to 35 wt.% sand concentration. The flow loop was then drained with the elbow sample removed.


University of Saskatchewan


Cathodic Protection, Erosion Corrosion, Slurry Erosive Wear, Synergism, Density Current