A novel polymer, poly(N1,N1-diallyl-N6,N6,N6-tripropylhexane-1,6-diaminium chloride (PTPHDC) was synthesized and tested as corrosion inhibitor for API X60 steel in 15 wt.% HCl solution at 25oC−90oC using Weight loss, electrochemical impedance spectroscopy, linear polarization resistance, potentiodynamic polarization and surface assessments. Results obtained showed that the polymer is an effective corrosion inhibitor for API X60 steel in an acidizing environment. Temperature increase from 25oC to 60oC favors the inhibition performance but performance slightly decline with temperature rise to 90oC. The inhibition efficiency of 100 ppm of the polymer was found to be 86.1, 90.2 and 87.5% at 25, 60 and 90oC respectively. The polymer acted as a mixed type corrosion inhibitor. The polymer performs better under hydrodynamic than in static conditions. The scanning electron microscopy (SEM) and atomic force microscopy (AFM) results are in good agreement with other experimental results and clearly show the effective performance of the polymer even at 90oC. Thermogravimetric analysis (TGA) and Fourier transformed infra-red spectroscopy (FTIR) results showed that the polymer before and after addition to the corrosive medium is stable. The polymer is thermally stable up to 214oC and its functional groups remain intact. The Polymer is a promising candidate for the formulation of an acidizing inhibitor.