Extracts of elephant grass (Pennisetum purpureum) blended with some intensifier halides like ammonium chloride (AMC) and potassium iodide (PTI) were investigated as corrosion inhibitor for mild steel. The corrosion process was monitored in 3.5% HCl bymass loss and electrochemical techniques at 30, 40, 50, 60 and 90 degrees C. Addition of AMC and PTI increased the inhibition efficiency with the highest inhibition efficiency obtained with PTI blended extract. The blends behaved as mixed type inhibitors and were spontaneously adsorbed on mild steel surface in exothermic nature. Synergistic parameters of the intensifier ions revealed cooperative effect. Kinetic data treatment indicated increase in energy barrier by intensifier ions. The results demonstrate that elephant grass extract blended with halide ions can act as alternative ecofriendly inhibitor for mild steel at elevated temperatures. (C) 2016 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.