Electrochemical impedance study of thermally sprayable polyethylene coatings

In the present work low density poly ethylene (LDPE) and maleic acid grafted LDPE (LDPE-g-MAc) were pigmented with red iron oxide at three different concentrations (i.e., 20, 30 and 40 wt%). The pigmented compositions were prepared in extruder and then cryogenically grounded to bring them in powder form. These compositions were applied on grit blasted mild steel specimen by flame spray technique. Corrosion resistance of red iron oxide based compositions was studied by electrochemical impedance spectroscopy (EIS). The grafted LDPE containing 30 wt% red iron oxide showed maximum resistance to corrosion compared to 20 and 40 wt% red iron oxide based compositions.